Thi công Hệ Sơn đường ống nước tuần hoàn nhà máy nhiệt điện Thăng Long

THANG LONG 2x300MW

THERMAL POWER PLANT PROJECT
THANG LONG POWER PLANT

Owner

JOINT STOCK COMPANY
Owner Consultant

FICHTNER GmbH ＆ Co. KG
WUHAN KAIDI ELECTRIC POWER

EPC Contractor

ENGINEERING CO., LTD.
SOUTHWEST ELECTRIC POWER

EPC Engineering
Designer

DESIGN INSTITUTE CO., LTD.

Document Title:

DESCRIPTION OF ANTICORROSIVE COATING FOR
BURIED WELDED PIPE

EPC Contract No. :
Document No. :

291210/EPC/TLP-KD

50-F416S- S0205-02

Design Stage:
Rev. No. :

DESIGN
B

Modified according to Owner’s

2

10.Jan.2016

1

25 SEP. 2015

First issue

张雄

李贵雷

李贵雷

徐明

Rev.

Date

Description

Prepared

Checked

Reviewed

Approved

comments


CONTENTS
1 General.....................................................................................................1
2 The characteristics of international coating .............................................2
3 Paint system and requirement ..................................................................3
4 Surface Preparation..................................................................................9
5 Requirements to the application process ...............................................11
6 Requirements of inspection ...................................................................12
7 Requirements to patch and touch up......................................................14
8 Storage and transportation .....................................................................14
9 Annex……………………………………………………………….. 14


1 General

1.1 Summarize
Because of high performance, easy to application, good cost
performance, high volume solid epoxy coating always used to replace
coal-tar coating. Coal-tar coating comprised the compound to cause
cancer and is restricted in many country, Soft film and bad mechanical
performance. High volume solid epoxy have low VOC and low effect to
environment，excellent water resistant, excellent adhesion and good
application performance, can provide good anti-corrosion performance。
High volume solid epoxy coating had be used in a lot of coal power
projects and nuclear power plants.
In this specification, Akzonobel International paint company high volume
solid epoxy coating is chosen to give application requirement as an
example of epoxy coating.
To insure the quality of coating application, the coating supplier should
provide technical service people when coating is applied. The service life
of protective coating is: exterior and interior > 20years. If other same
type epoxy coating is adopted, the rated technical requirements for
manufactory should be followed.
1.2 Abbreviations
DFT
Dry Film Thickness
WFT
Wet Film Thickness
TDFT
Total Dry Film Thickness
SSPC
Steel Structures Painting Council
ISO
International Standard Organization
NACE

National Association of Corrosion Engineer
1.3 Standards References
ISO12944-1998

Paints and varnishes - Corrosion protection of steel

structures by protective paint systems
ISO 4624-2002

Paints and Varnished - Pull-off test for adhesion

1


ISO 8501-1 2007

Preparation of steel substrates before application of

paints and related products - Visual assessment of surface cleanliness
2 The characteristics of international coating
International coating is two components, low VOC, high volume solid
epoxy coating. It is environment friendly coating. Four types of
international coating are introduced as below according to the of
manufacturer data（more detail information is referred to part 9-annex）:
(1). Interseal670HS is a type epoxy coating of low VOC, two component
high build, high solids, low surface toleration. It has passed the
certification of NSI/NSF Standard 61. NSF Certification is for tanks
greater than 100 gallons (378½ liters) and greater than 5cm’s pipeline.
That’s means it could be used in drinkable water and provides excellent
anti-corrosive protection in industrial, coastal structures, pulp and paper

plants, bridges and off shore environments in both atmospheric
exposure and immersion service.
(2). Interzone278 is a type epoxy coating of two component, high solids.
It is suitable for pipeline and splash zone both fresh water and sea water.
And it could get 500μm in single layer.
(3). Interthane990 is a type finish coating of two component acrylic
polyurethane. Its characteristic is a high UV resistance and good color
retention. It is used to give excellent durability and long term recoat
ability.
(4). Intercrete 4840 is a type coating of polymer modified cementitious
coating. Its pressure of pulling off test is very high, and is used for
protecting external surfaces of pipe jacking
(5).The technical index of epoxy coating should satisfied the requirement
below.

2


Surface tolerant

Item

Unit

Volume Solid

%

≥82

≥80

Touch Dry (25℃)

Hour

≤5

≤4

Hard Dry(25℃)

Hour

≤18

≤16

Impact

Cm

≥50

≥50

Pull off Test

MPa

≥5

≥5

epoxy coating

Epoxy coating

3. Paint system and requirement
3.1 Structure and requirement for coating
Paint system is designed according to the data of manufacturer.

3


Table 3.1-1 Structure and requirement for coating
No.

Anticorrosion Level

corrosive
environment

DFT

Coating layer

(μm)

Protected pipes

Primer: Interzone 278
1

Im2-Sea or Topcoat: Interzone
anticorrosion(external
brackish
Welded Steel
-Epoxy Coating
of pipe immersed in
water
pipe
Im3-Soil
soil)

Protected by

300μm

-Epoxy Coating

Extra enhanced

278
300μm

Remarks

both cathodic
External surfaces of CW pipes

immersed in soil

protection and
coating system
Design

Total:600μm

life>20years
External surfaces of
2
Welded Steel
pipe

immersed in soil as follow

Enhanced
anticorrosion(external
of pipe immersed in

steel pipe

Primer:
Im3-Soil

Interzone

service water pipe

278

300μm

-Epoxy Coating

fire water pipe
coal contaminated water pipe

soil)

emergent oil discharge pipe
reclaimed water pipe, etc.

4

Design
life>20years


No.

Anticorrosion Level

corrosive

DFT

Coating layer

environment

Topcoat:

Interzone

(μm)

Protected pipes

Remarks

278
300μm

-Epoxy Coating

Total:600μm
Primer:

interseal

670HS- Surface tolerant

200μm

epoxy
3
Welded Steel
pipe

Enhanced

Intermediate:

anticorrosion

Im2-Sea or 670HS- Surface tolerant
brackish epoxy
water
Topcoat:
Interseal

200μm

670HS- Surface tolerant

200μm

(Internal surfaces of
steel pipe)

Interseal
Internal surfaces of CW pipes

epoxy
Total:600μm

5

Protected by
both cathodic

protection and
coating system
Design
life>20years


No.

Anticorrosion Level

corrosive

Coating layer

environment

Primer:

DFT

150μm

epoxy
4
Welded Steel
pipe

Intermediate:

(External surfaces of

outdoor above ground

Interseal

outdoor

follow:
150μm

epoxy

service water pipe
fire water pipe

Topcoat: Interthane 990-

steel pipe)

External surfaces of

above ground steel pipe as

670HS- Surface tolerant
C5-M

Remarks

interseal

670HS- Surface tolerant

Normal anticorrosion

Protected pipes

(μm)

Surface tolerant epoxy

60μm

Design
life>20years

coal contaminated water pipe
reclaimed water pipe.
pipe support and hanger, etc

Total:360μm

5
Welded Steel
pipe

External surfaces of indoor steel

Normal anticorrosion
(External surfaces of
indoor above ground

C4

Primer: interseal 670HSSurface tolerant epoxy

220μm

steel pipe)

pipe as follow：:

Design

service water pipe

life>20years

fire water pipe
Topcoat: Interthane 990Surface tolerant epoxy

6

coal contaminated water pipe
60μm

reclaimed water pipe


No.

Anticorrosion Level

corrosive
environment

Coating layer

DFT
(μm)
Total:280

Protected pipes

Remarks

pipe support and hanger, etc

Primer: Intercrete 4840-

6
Welded Steel
pipe

Polymer

Enhanced

500μm

cementitious coating

anticorrosion
（External surfaces of

Modified

Im3-Soil

pipe jacking）

Topcoat: Intercrete 4840Polymer

Modified

500μm

pipe jacking construction

Design

segment of CW pipe

life>20years

cementitious coating
Total:1000μm
Primer: interseal 670HS-

7
Galvanized
steel pipe

Surface tolerant epoxy

Enhanced

Topcoat: interseal 670HS-

anticorrosion(external
of pipe immersed in

Im3-Soil

Surface tolerant epoxy

150
150

External surfaces of

steel pipe

immersed in soil as follow
service water pipe
fire water pipe
coal contaminated water pipe

soil)

Total:300μm emergent oil discharge pipe
reclaimed water pipe, etc.

7

Design
life>20years


No.

Anticorrosion Level

corrosive

Coating layer

environment

Primer:
8
Galvanized
steel pipe

670HS- Surface tolerant

(External surfaces of

epoxy

outdoor above ground

Protected pipes

Topcoat: Interthane 990-

Remarks

External surfaces of indoor steel
100μm

pipe as follow:
service water pipe

Surface tolerant epoxy

steel pipe)

(μm)

interseal

Normal anticorrosion
C5-M

DFT

60μm

fire water pipe

Design

life>20years

coal contaminated water pipe
Total:160μm reclaimed water pipe, etc
External surfaces of indoor steel

9
Galvanized
steel pipe

Normal anticorrosion
(External surfaces of
indoor above ground

Topcoat: Interthane 990C4

Surface tolerant epoxy

60μm

pipe as follow：:
service water pipe
fire water pipe

steel pipe)
Total:60μm

Notes:
1、The drawings for cathodic protection of CW pipes refer to volume 50-F416S-S0206.

8

coal contaminated water pipe
reclaimed water pipe, etc

Design
life>20years


Steel pipe corrosive environments are classified by the categories of ISO
12944 Part 2, including C1, C2, C3, C4, C5-I, C5-M, Im1, Im2, Im3.
Structure and requirement for coating is showed as table 3.1-1.
3.2 Selection of anticorrosion level
The anticorrosion level of steel pipe is showed in table3.1-1. Pipeline above
ground (includes attachment), the exterior anticorrosion should use normal
anticorrosion (external of pipe in atmosphere). The anticorrosion level of
pipeline buried in soil should be enhanced anticorrosion or extra enhanced
anticorrosion.
If there are requirements of anticorrosion level in other volumes of water
supply and fire fighting part, the anticorrosion should be applied as above
requirements.

3.3 Colors
（1）Pipeline buried in soil: black topcoat
（2）Fire water pipe above ground: red topcoat
（3）Other pipeline above ground: according to the requirements of
owners.
4 Surface Preparation
4.1 Steelwork preparation
In order to provide surfaces which will ensure optimum paint

performance, prior to blast cleaning, weld defects such as pinholes and
discontinuities shall be repaired. Sharp edges and flame-cut edges shall
be reduced to R=2mm by grinding. Welds shall be smooth and free of all
weld slag and weld spatter.
4.2 Degreasing
Prior to blasting, all deposits of grease or oil or humectants caused by
the NDT test shall be removed from the surface.
4.3 Abrasives
Blasting abrasives shall be dry, clean and free from contaminants, which
9


will not be detrimental to the performance of the coating. Abrasives used
must meet specified requirements as ISO.
Size of abrasive particles for blast cleaning shall be such that the
prepared surface profile height (anchor pattern profile) is in accordance
with the requirements for the applicable coating system. The surface
profile shall be graded in accordance with ISO.
During the blasting operation care must be taken to prevent the
possibility of oil and/or water to contaminate the blasted surface.
Compressors must accordingly be fitted with efficient oil and water traps.
4.4 Blasting
All steel surface shall be blasting cleaned to ISO 8501-1 Sa2 ½ with
surface profile Rz 40-75μm or roughness of “medium (G)”
The surface to be coated shall be clean, dry, free from oil/grease, and
have the specified roughness and cleanliness until the first coat is
applied. All dust must be removed completely.
Coatings shall be applied within 4hours of surface preparation and/or
before rust bloom occurs. Should visible rusting occur or the cleaned
surface becomes wet or otherwise contaminated, the surface shall be

recleaned to the degree previously required.
4.5 The galvanized steel pipe surface shall be degreased as per
SSPC-SP1 “Solvent Cleaning”, and removed the oxide (for example:
zinc salts etc.) with high pressure water washing or swabbing down.
Then the sweeping and blasting will be carried out for the galvanizing
steel surface preparation in order to achieve the proper profile(Rz25－
40μm roughness) according to ISO Sa 1“brush-off blast cleaning”. The
proper profile shall be helpful to obtain excellent adhesion of coats.
During sweeping and blasting, a low air pressure (4-5kg/cm2) shall be
used and the nozzle shall be hold at 1 meter from the object.
4.6 Preparation of Connecting Flanges, Aluminum and some other
non-steel surfaces should be accorded to its application illustration.

10


5 Requirements to the application process
Application methods please refer to Product Application Procedure and
must comply with the relevant national and international regulations, if
the process is not the same, should execute the requirement that is
higher quality requirements.
5.1 When temperature is lower than 5℃ or higher than 40℃, according
measures must be taken to improve ambient weather condition to the
acceptable range.
5.2 No final blast-cleaning or coating application shall be done if the
relative humidity is more than 85% and when the steel temperature is
less than 3℃ above the dew point.
5.3 Paint application is not allowed when raining, snowing,water or ice
on the substrates, or heavy fog around.
5.4 Before application of Interthane 990, RH should be controlled under

80% to avoid the blanching and loss of gloss of the finish coat.
5.5 DFT inspection should be carried out 90-10 rules, means 90%
readings should be reach Specified DFT, and remaining 10% readings
should reach 90% of specified DFT. DFT inspection will be carried out
according ISO.
5.6 After applying the paint , pay more attention to avoid damaged in the
process of lifting and transporting, Touch-up shall be carried out on all
damaged coating surface, otherwise, it shall not be installed.
5.7 When ventilation condition is not well, sufficient ventilation must be
provided.
5.8 The thickness of the primer and finish must meet the design
requirement, the Application methods must be according to the Product
Application Procedure.
5.9 After the application of paint, no person shall enter the pipe when the
coating is not completely hard dry, otherwise damage surfaces need to
11


be recoated.
5.10 The rubber and rubber strap must be used in order to prevent
mechanical collision and coating damage in transporting, loading,
handling, piping, and other processes.
5.11 Paint is dangerous goods, it should be stored in cool dry place,
away from fire, fire is strictly prohibited on-site, sufficient ventilation and
reliable safety precautions must be provided to avoid poisoning and fire
accidents.
5.12 Detailed requirement of application can be found in the Application
Procedure File of manufacturer
6 Requirements of inspection
6.1 Painting contractor have the responsibility to make the detailed

Painting Schedule＆ QC procedure and to establish Quality Control
System, to be in charge of by full-time special personnel. Painting
contractor should have the following tools and equipments for painting
Inspection, these equipments should be calibrated and put on owner’s
Records.
Wet film and Dry film thickness gauge, Relative Humidity gauge, Surface
Temperature gauge, Dew point Gauge, Viewfinder, surface profile
comparator, Lamp, Adhesion testing equipment (pull-off ＆ Cross-cut ),
Salinometer, Camera, Applicable Painting Standards, ＆ Specification.
6.2 Check points
(1) Steel work and cleaning check points: Spatters, Laminations, Sharp
Undercuts, Rough welds, Sharp edges, welding smoke, oil and grease to
be removed.
(2) Surface preparation Check Points: Wrapping (Before ＆ After
Blasting ), Cleanliness, Roughness profile (RZ40—75μm), Dust
cleanliness(Rating 3). Oil ＆

grease, Ambient Conditions (Air
12


temperature, Relative humidity, steel temperature, Dew point).
(3) Check points during painting application: Application equipments,
Ventilation, Wrapping, Mixing, Thinning, Stirring, Paint storage,
Stripe-coat or Touch-up, W.F.T, Ambient condition (Same as the above:
Air temp, R.H,S.T, D P.).
(4) Check points for final inspection
Finish coat (Topcoat ): Uniform color ＆ gloss, no sagging, no running,
no spraying dust, no contaminations.
Imperfection: Full coverage, no pinholes, holidays ＆ cavities. Pinholes,

no rusty spots
D.F.T. shall be according to min /max DFT in specification.
6.3 WFT and DFT inspection
(1) WFT should be measured immediately after painting application,
since the evaporation of solvents will affect the readings if not performed
at once. WFT measurements as the specified to be carried out according
to ISO2808:1997.Regularly WFT measurement shall conduce to control
the paint consumption and obtain the proper DFT.
(2) DFT measurement shall be carried out after the completion of and
sufficient drying of each coat applied. Recommended, non-destructive
methods for the determination of DFT on metallic, magnetic and
non-magnetic substrates are described in SSPC PA2 Method or
ISO2808 requirement.
(3) Adhesion Test
The measurement of adhesion and cohesion properties of a coating
system is destructive and is normally performed in connection with
complaints, It is pre-qualification testing when specified or on reference
areas and not as a routine test. A recommended procedure for the
assessment of adhesion/cohesion shall be specified as ASTM 3359
13


Cross-cutting) or ISO4624 (Pull-off test).
7 Requirements to patch and touch up
(1) Patching and repairing coating system and materials used should be
the same as the pipe body of the coating, the touch up work should be
after welding and the pipe surface temperature below 40℃
(2) Touch-up on site shall be carried out on all damaged coating surface,
including damages resulted from transportation, handling, erection,
welding, cutting and any other hot-work.

(3) Patching and repairing area should be pretreated.
(4) Intact coating around damaged area must be feathered and slightly
roughened the adjacent surface to ensure a smooth touch up coating
surface.
(5) Prior to touch-up, damages assessment should be known then to get
a touch-up plan. Touch-up should be carried out starting with the right
damaged coat.
(6) Power tools can be used for grinding, rotary grinders, discs are
recommended. However, rotary brush is not recommended because of
its polishing tendency on steel surface to affect coating adhesion.
(7) All climate control requirements should be same as it in new
construction painting.
(8) During touch-up inside, sufficient ventilation and lighting must be
provided.
8 Storage and transportation
(1) Anticorrosive pipe shall be piled up in accordance with specification
classification and using the width not less than 150 mm soft isolation pad,
pipe cannot be stacked.
(2) Uncured pipe cannot be shipped. Pipe handing, transport should
meet the requirement of long-distance pipeline route construction.
14


(3) Pipe can be affected by sunlight, and should not be exposed to
sunlight exceed 3 months.
(4) Pipe should prevent damage the coating in the transport, stacking,
lifting and other processes. Mouth parts of the pipe should protected
against deformation.
(5) Crane should be used to prevent pipe from rolling when pipe is
unloaded.

(7) All equipments are in good condition for lifting the pipe, it is not
allowed to make the pipe fall, hit each other, free scroll or drag along the
ground.
9 Annex

15


Interseal® 670HS
Surface Tolerant Epoxy
PRODUCT
DESCRIPTION

A low VOC, two component high build, high solids surface tolerant epoxy maintenance coating.

INTENDED USES

For application to a wide variety of substrates including hand prepared rusty steel, abrasive blast cleaned and
hydroblasted steel, and a wide range of intact, aged coatings.
Provides excellent anti-corrosive protection in industrial, coastal structures, pulp and paper plants, bridges
and offshore environments in both atmospheric exposure and immersion service.
NSF Certification is for tanks greater than 100 gallons (378.5 litres).

Certified to NSF/ANSI 61

PRACTICAL
INFORMATION FOR
INTERSEAL 670HS

Colour

Available in a wide range of colours including Aluminium

Gloss Level

Semi-gloss (Aluminium is eggshell)

Volume Solids

82% ± 3% (depends on colour)

Typical Thickness
100-250 microns (4-10 mils) dry equivalent to
122-305 microns (4.9-12.2 mils) wet
Theoretical Coverage


6.56 m2/litre at 125 microns d.f.t and stated volume solids
263 sq.ft/US gallon at 5 mils d.f.t and stated volume solids

Practical Coverage

Allow appropriate loss factors

Method of Application

Airless spray, Air spray, Brush, Roller

Drying Time

Overcoating Interval
Interseal 670HS with Self

Overcoating Interval with
recommended topcoats

Temperature Touch Dry

Hard Dry

Min

Max

Max †

Min

Max

Max †#

10ºC (50ºF)

8 hours

32 hours

32 hours

6 weeks

Extended*

20 hours

21 days

12 weeks

15ºC (59ºF)

7 hours

26 hours

26 hours

4 weeks

Extended*

14 hours

14 days

8 weeks

25ºC (77ºF)

5 hours

18 hours

18 hours

14 days

Extended*

10 hours

7 days

4 weeks

40ºC (104ºF)

2 hours

6 hours

6 hours

7 days

Extended*

4 hours

3 days

2 weeks



For curing at low temperatures, an alternative curing agent is available. See Product Characteristics for details.



Refers to situations where immersion is likely to occur

† Refer to atmospheric service only
* See International Protective Coatings Definitions & Abbreviations
# Maximum overcoating intervals are shorter when using polysiloxane topcoats.


REGULATORY DATA

Consult International Protective Coatings for further details.

Flash Point (Typical) Base (Part A) 36°C (97°F) Curing Agent (Part B) 56°C (133°F)
Product Weight

VOC
114 g/kg


EU Solvent Emissions Directive
(Council Directive 1999/13/EC)

2.00 lb/gal (240 g/lt)

EPA Method 24



151 g/lt

Chinese National Standard GB23985

Protective Coatings
Page 1 of 4
Issue Date:18/2/2015
Ref:2394

Mixed 33°C (91°F)

1.6 kg/l (13.3 lb/gal)

Worldwide Product


Interseal® 670HS
Surface Tolerant Epoxy
SURFACE
PREPARATION

The performance of this product will depend upon the degree of surface preparation. The surface to be coated
should be clean, dry and free from contamination. Prior to paint application all surfaces should be assessed
and treated in accordance with ISO 8504:2000.
Accumulated dirt and soluble salts must be removed. Dry bristle brushing will normally be adequate for
accumulated dirt. Soluble salts should be removed by fresh water washing.
Abrasive Blast Cleaning
For immersion service, Interseal 670HS must be applied to surfaces blast cleaned to Sa2.5 (ISO 8501-1:2007)
or SSPC-SP10. However, for atmospheric exposure best performance will be achieved when Interseal 670HS
is applied to surfaces prepared to a minimum of Sa2.5 (ISO 8501-1:2007) or SSPC-SP6.
Surface defects revealed by the blast cleaning process, should be ground, filled, or treated in the appropriate
manner.
A surface profile of 50-75 microns (2-3 mils) is recommended.
Hand or Power Tool Preparation
Hand or power tool clean to a minimum St2 (ISO 8501-1:2007) or SSPC-SP2.
Note, all scale must be removed and areas which cannot be prepared adequately by chipping or needle gun
should be spot blasted to a minimum standard of Sa2 (ISO 8501-1:2007) or SSPC-SP6. Typically this would
apply to C or D grade rusting in this standard.
Ultra High Pressure Hydroblasting/Abrasive Wet Blasting
May be applied to surfaces prepared to Sa2.5 (ISO 8501-1:2007) or SSPC-SP6 which have flash rusted to
no worse than Grade HB2.5M (refer to International Hydroblasting Standards) or Grade SB2.5M (refer to
International Slurry blasting Standards). It is also possible to apply to damp surfaces in some circumstances.
Further information is available from International Protective Coatings.
Aged Coatings
Interseal 670HS is suitable for overcoating a limited range of intact, tightly adherent aged coatings. Loose or
flaking coatings should be removed back to a firm edge. Glossy finishes may require light abrasion to provide
a physical ‘key’. See Product Characteristics section for further information.

APPLICATION

Mixing

Material is supplied in two containers as a unit. Always mix a complete unit in the
proportions supplied. Once the unit has been mixed it must be used within the
working pot life specified.

(1)
Agitate Base (Part A) with a power agitator.

(2)
Combine entire contents of Curing Agent (Part B)

with Base (Part A) and mix thoroughly with power agitator.
Mix Ratio

5.67 parts : 1.00 part by volume

Working Pot Life

10°C (50°F)

15°C (59°F)

25°C (77°F)

40°C (104°F)

5 hours

3 hours

2 hours

1 hour

Airless Spray
Recommended Tip range 0.45-0.58 mm (18-23 thou)

Total output fluid pressure at spray tip not less than

176 kg/cm2 (2,500 p.s.i.)
Air Spray
Recommended Gun
(Pressure Pot)
Air Cap

Fluid Tip

DeVilbiss MBC or JGA
704 or 765
E

BrushRecommended
Typically 100-125 microns (4-5 mils) can be achieved
Roller

Recommended Typically 75-100 microns (3-4 mils) can be achieved

Thinner
International GTA220

(or GTA415)


Cleaner


International GTA822
(or GTA415)

Work Stoppages

Do not allow material to remain in hoses, gun or spray equipment. Thoroughly flush
all equipment with International GTA822. Once units of paint have been mixed they
should not be resealed and it is advised that after prolonged stoppages work
recommences with freshly mixed units.

Clean Up

Clean all equipment immediately after use with International GTA822. It is good
working practice to periodically flush out spray equipment during the course of the
working day. Frequency of cleaning will depend upon amount sprayed, temperature
and elapsed time, including any delays.



All surplus materials and empty containers should be disposed of in accordance

with appropriate regional regulations/legislation.










Page 2 of 4

Thinning is not normally required. Consult the
local representative for advice during application
in extreme conditions. Do not thin more than
allowed by local environmental legislation.


Interseal® 670HS
Surface Tolerant Epoxy
PRODUCT
CHARACTERISTICS

For water immersion service, surface preparation to a minimum of Sa2.5 (ISO 8501-1:2007) or SSPC-SP10
followed by application of multi-coats of Interseal 670HS to a total minimum dry film thickness of 250 microns
(10 mils) is required.
Colours derived from chromascan bases as the first coat of a specification for immersion service is not
recommended.
Maximum film build in one coat is best attained by airless spray. When applying by methods other than airless

spray, the required film build is unlikely to be achieved. Application by air spray may require a multiple cross spray
pattern to attain maximum film build. Low or high temperatures may require specific application techniques to
achieve maximum film build.
If salt water is used in the wet blast process the resulting surface must be thoroughly washed with fresh water
before application of Interseal 670HS. With freshly blasted surfaces a slight degree of flash rusting is allowable, and
is preferable to the surface being too wet. Puddles, ponding and accumulations of water must be removed.
Interseal 670HS may be applied to suitably sealed or primed concrete; contact International Protective Coatings for
further advice on specification and primers.
Interseal 670HS is suitable for overcoating intact, aged alkyd, epoxy and polyurethane systems. However,
this product is not recommended where thermoplastic coatings such as chlorinated rubbers and vinyls have
previously been used. Please consult International Protective Coatings for alternative recommendations.
Surface temperature must always be a minimum of 3°C (5°F) above dew point.
Level of sheen and surface finish is dependent on application method. Avoid using a mixture of application methods
whenever possible.
In common with all epoxies Interseal 670HS will chalk and discolour on exterior exposure. However, these
phenomena are not detrimental to anti-corrosive performance.
Premature exposure to ponding water will cause a colour change, especially in dark colours.
Interseal 670HS can be used as a non-skid deck system by modification with addition of GMA132 (crushed flint)
aggregate. Application should then be to a suitably primed surface. Typical thicknesses will be between
500-1,000 microns (20-40 mils). Preferred application is by a suitable large tip hopper gun (e.g. Sagola 429
or Air texture gun fitted with a 5-10 mm nozzle). Trowel or roller can be used for small areas. Alternatively,
a broadcast method of application can be used. Consult International Protective Coatings for further details.
Interseal 670HS is certified to NSF/ANSI Standard 61 (selected colours only). Consult International Protective
Coatings for further details. Certification is for tanks greater than 100 gallons (378.5 litres), for pipes which are
6 inches (15 cm) in diameter or greater and for valves which are 2 inches (5 cm) in diameter or greater.
Low Temperature Curing
A winter grade curing agent is also available to enable more rapid cure at temperatures less than 10°C (50°F),
however this curing agent will give an initial shade variation and more rapid discoloration on weathering.
Interseal 670HS is capable of curing at temperatures below 0°C (32°F). However, this product should not be
applied at temperatures below 0°C (32°F) where there is a possibility of ice formation on the substrate.

Overcoating Interval
Interseal 670HS with Self
Temperature Touch Dry Hard Dry

Overcoating Interval with
recommended topcoats

Min

Max ●

Max †

Min

Max ●

Max †

-5ºC (23ºF)

24 hours

72 hours

72 hours

12 weeks

Extended*

72 hours

84 hours

12 weeks

0ºC (32ºF)

16 hours

56 hours

56 hours

10 weeks

Extended*

42 hours

54 hours

10 weeks

5ºC (41ºF)

9 hours

36 hours

36 hours

8 weeks

Extended*

36 hours

48 hours

8 weeks

10ºC (50ºF)

5 hours

24 hours

24 hours

6 weeks

Extended*

16 hours

24 hours

6 weeks

● Refers to situations where immersion is likely to occur



† Refer to atmospheric service only



* See International Protective Coatings Definitions & Abbreviations

Touch dry times shown above are actual drying times due to chemical cure, rather than physical set due to
solidification of the coating film at temperatures below 0°C (32°F).
Note: VOC values quoted are based on maximum possible for the product taking into account variations due
to colour differences and normal manufacturing tolerances.
Low molecular weight reactive additives, which will form part of the film during normal ambient cure conditions,
will also affect VOC values determined using EPA Method 24

SYSTEMS
COMPATIBILITY

Interseal 670HS will normally be applied to correctly prepared steel substrates. However, it can be used over
suitably primed surfaces. Suitable primers are:
• Intercure 200
• Interplus 356
• Intergard 269

• Interzinc 315

• Interplus 256

Where a cosmetically acceptable topcoat is required the following products are recommended:
•
•
•
•

Intercryl 530
• Interfine 878
Intergard 740
• Interthane 990
Interfine 629HS • Interfine 979
Interthane 870

Other suitable primers/topcoats are available. Consult International Protective Coatings.

Page 3 of 4


Interseal® 670HS
Surface Tolerant Epoxy
ADDITIONAL
INFORMATION

Further information regarding industry standards, terms and abbreviations used in this data sheet can be
found in the following documents available at www.international-pc.com:


• Definitions & Abbreviations

• Surface Preparation


• Paint Application


• Theoretical & Practical Coverage

Individual copies of these information sections are available upon request.
SAFETY
PRECAUTIONS

This product is intended for use only by professional applicators in industrial situations in accordance with the advice
given on this sheet, the Material Safety Data Sheet and the container(s), and should not be used without reference to
the Material Safety Data Sheet (MSDS) which International Protective Coatings has provided to its customers.
All work involving the application and use of this product should be performed in compliance with all relevant
national, Health, Safety & Environmental standards and regulations.
In the event welding or flame cutting is performed on metal coated with this product, dust and fumes will be emitted
which will require the use of appropriate personal protective equipment and adequate local exhaust ventilation.
If in doubt regarding the suitability of use of this product, consult International Protective Coatings for further advice.

PACK SIZE

Unit Size

Part A
Part B
Vol

Pack
Vol
20 litre
17 litre
20 litre
3 litre
5 US gal
4.25 US Gal
5 US Gal
0.75 US Gal
For availability of other pack sizes, contact International Protective Coatings

SHIPPING WEIGHT
(TYPICAL)

STORAGE

Unit Size
20 litre
5 US gal
Shelf Life

Part A
30.8 kg
64.9 lb

Pack
3.7 litre
1 US gal

Part B
3.5 kg
6.8 lb

12 months minimum at 25°C (77°F). Subject to re-inspection thereafter.
Store in dry, shaded conditions away from sources of heat and ignition.
Protect from frost.

Important Note
The information in this data sheet is not intended to be exhaustive; any person using the product for any purpose other than that specifically recommended in this data sheet without first
obtaining written confirmation from us as to the suitability of the product for the intended purpose does so at their own risk. All advice given or statements made about the product
(whether in this data sheet or otherwise) is correct to the best of our knowledge but we have no control over the quality or the condition of the substrate or the many factors affecting the
use and application of the product. Therefore, unless we specifically agree in writing to do so, we do not accept any liability at all for the performance of the product or for (subject to the
maximum extent permitted by law) any loss or damage arising out of the use of the product. We hereby disclaim any warranties or representations, express or implied, by operation of
law or otherwise, including, without limitation, any implied warranty of merchantability or fitness for a particular purpose. All products supplied and technical advice given are subject to
our Conditions of Sale. You should request a copy of this document and review it carefully. The information contained in this data sheet is liable to modification from time to time in the
light of experience and our policy of continuous development. It is the user’s responsibility to check with their local representative that this data sheet is current prior to using the product.
This Technical Data Sheet is available on our website at www.international-marine.com or www.international-pc.com, and should be the same as this document. Should there be any
discrepancies between this document and the version of the Technical Data Sheet that appears on the website, then the version on the website will take precedence.
Copyright © AkzoNobel, 28/10/2015.
All trademarks mentioned in this publication are owned by, or licensed to, the AkzoNobel group of companies.

www.international-pc.com

Page 4 of 4


Interzone 278
E p o x y

Product Description

A low VOC, two component high build, high solids, epoxy immersion coating.
Designed to give long term protection in a single coat for immersion service
situations.
A winter curing agent is available to assist faster turn around times in cold
conditions.

Intended Uses

A single product, immersion coating system suitable for the storage of fresh or salt
water.
An extremely tough and damage resistant coating that can be applied up to 500um
DFT in a single coat. Also suitable for certain atmospheric applications where
chemical splash and spill resistance to petroleum products, aliphatic solvents,
alkalis and other chemical products is required.
Not suitable for use as a chemically resistant tank lining, or in situations where
continuous chemical contact will occur.

Practical
Information for
Interzone 278

Colour

Black

Gloss Level

Semi Gloss

Volume Solids

83%

Typical Thickness

200-500 microns dry equivalent to 240-602 microns wet

Theoretical Coverage

2.76 m2/litre at 300 microns d.f.t and stated volume solids

Practical Coverage

Allow appropriate loss factors

Method of Application

Airless spray, Brush, Roller

Drying Time

Regulatory
Data

Page No. 1 of 4

Temperature

Touch Dry

10°C
15°C
25°C
40°C

12 hours
8 hours
4 hours
2 hours

(50°F)
(59°F)
(77°F)
(104°F)

Flash Point

Base (Part A)
<10°C

Product Weight

1.70 kg/l

VOC

170 g/l

Hard Dry

Overcoating Interval with
Interzone 278
Minimum
Maximum

48 hours
30 hours
16 hours
8 hours

C/A (Part B)
>65°C

48 hours
30 hours
16 hours
8 hours

14 days
10 days
5 days
48 hours

Mixed
<10°C


Interzone 278

E p o x y

Surface
Preparation

All surfaces to be coated should be clean, dry and free from contamination. Prior to paint application all
surfaces should be assessed and treated in accordance with ISO 8504:1992.
Abrasive Blast Cleaning
For immersion service, Interzone 278 must be applied directly to surfaces blast cleaned to a minimum of
Sa2½ (ISO 8501-1:1988) SSPC SP10, however Interzone 278 is also suitable for a limited number of
atmospheric applications where chemical resistance to splashes and spills is required. When used in
atmospheric applications Interzone 278 should be applied over an approved anti-corrosive primer.
Primed Surfaces
The primer surface should be dry and free from all contamination, and Interzone 278 must be applied Within
the overcoating intervals specified (consult the relevant product data sheet). Areas of breakdown, damage
etc., should be prepared to the specified standard and patch primed prior to the application of Interzone 278.
Galvanised steel
Degrease to SSPC-SP1 and lightly abrasive blast to SSPC SP7 or power tool prepare to SSPC SP3 then
apply full coat of Interzone 278
Concrete
Concrete should be sound, in tact, and cured for a minimum of 28 days prior to coating. The moisture
Content of the concrete should be below 6%. All surfaces should be clean, dry and free from curing and
trowelling compounds, release agents, surface hardeners, efflorescence, grease, oil, dirt, and old coatings. All
poured and pre-cast concrete must also be sweep blasted or acid etched to remove laitence. Large cracks
should be filled with an appropriate filler. First coat may require thinning to assist penetration of the
substrate.

Application

Mixing

Material is supplied in two containers as a unit. Always mix a complete unit in the
proportions supplied. Once the unit has been mixed it must be used within the
working pot life specified.
(1)
(2)

Page 2 of 4

Agitate Base (Part A) with a power agitator.
Combine entire contents of Curing Agent (Part B) with
Base (Part A) and mix thoroughly with power agitator.

Mix Ratio

4 parts : 1 part by volume

Working Pot
Life

10°C (50°F)
4 hours

Airless Spray
-

Recommended

Air Spray
(Pressure Pot)

Suitable Thin up to 20% Gun DeVilbiss MBC or JGA
(Note: Air Spray Suitable Air Cap 704 or 765
for atmospheric
Fluid Tip E
applications only)

Brush

Suitable - Small areas
only

Typically 100 microns can be
achieved

Roller

Suitable - Small areas
only

Typically 100 microns can be
achieved

Thinner

International GTA007

Cleaner

International GTA220

Work Stoppages

Do not allow material to remain in hoses, gun or spray equipment. Thoroughly
flush all equipment with International GTA220. Once units of paint have been
mixed they should not be resealed and it is advised that after prolonged
stoppages work recommence with freshly mixed units.

Clean Up

Clean all equipment immediately after use with International GTA220. It is good
working practice to periodically flush out spray equipment during the course of
the working day. Frequency of cleaning will depend upon amount sprayed,
temperature and elapsed time, including any delays. All surplus materials and
empty containers should be disposed of in accordance with appropriate regional
regulations/legislation.depend upon amount sprayed, temperature and elapsed
time, including any delays. All surplus materials and empty containers should be
disposed of in accordance with appropriate regional regulations/legislation.

15°C (59°F)
2 hours

25°C (77°F)
1 hours

40°C (104°F)
30 minutes

- Tip range 0.53-0.66 mm (21-26 thou)
Total output fluid pressure at spray tip not

less than 211 kg/cm2 (3,000 p.s.i.)

Do not thin more than allowed by local
environmental legislation.


Interzone 278
E p o x y

Product
Characteristics

Optimum film characteristics are best attained by airless spray. When applying by
methods other than airless spray, the required film build is unlikely to be achieved.
Application by conventional air spray may require a multiple cross spray pattern to
attain maximum film build. Low or high temperatures may require specific
application techniques to achieve maximum film build.
Application by other methods, e.g. brush or roller, may require more than one coat
and should only be used for small areas or touch-up work and should only be used
when Interzone 278 is being employed in atmospheric applications. Application by
techniques other than airless spray should be avoided for immersion service.
For airless spray application, avoid thinning, thin only in exceptional circumstances
for ease of application.
This product will not cure adequately below 5°C. For maximum performance
ambient curing temperatures should be above 10°C . Surface temperature must
always be a minimum of 3°C above dew point.
In common with all epoxies Interzone 278 will chalk and discolour on exterior
exposure. However, these phenomena are not detrimental to anti-corrosive
performance.
Drying times for Winter Curing Agent

Temperature
10°C
15°C

Touch Dry
10 hours
6 hours

Hard Dry
30 hours
16 hours

Overcoating Interval
with Self
Minimum Maximum
30 hours
14 days
16 hours
7 days

Working Pot Life using Winter Curing Agent
10°C
15°C
3 hours
1½ hours

Systems
Compatibility

For immersion service Interzone 278 must be applied direct to correctly prepared
bare steel. However for atmospheric splash and spill applications suitable
anticorrosive primers may be employed such as:
Interzinc 42
Interzinc 315
Intercure 200

Interzinc 52
Interzinc 86
Intergard 251

Interzone 278 should only be topcoated with itself, and should never be overcoated
with another product. Consult International Protective coatings to confirm that
Interzone 278 is suitable for resistance to the product/chemical in question.

Page No. 3 of 4


Interzone 278
E p o x y

Additional
Information

Further information regarding industry standards, terms and abbreviations used in
this data sheet can be found in the following documents available at
www.international-pc.com:
•

Definitions & Abbreviations

•

Surface Preparation

•

Paint Application

•

Practical & Theoretical Coverage

Individual copies of these information sections are available upon request.
•
Safety Precautions

Water Borne Coatings Recommended Working
Procedures

This product is intended for use only by professional applicators in industrial situations in
accordance with the advice given on this sheet, the Material Safety Data Sheet and the
container(s), and should not be used without reference to the Material Safety Data Sheet
(MSDS) which International Protective Coatings has provided to its customers.
All work involving the application and use of this product should be performed in compliance
with all relevant national, Health, Safety & Environmental standards and regulations.
In the event welding or flame cutting is performed on metal coated with this product, dust
and fumes will be emitted which will require the use of appropriate personal protective
equipment and adequate local exhaust ventilation.
If in doubt regarding the suitability of use of this product, consult International Protective

Coatings for further advice.

Pack Size

20 litre unit

Base
Curing Agent

16.00 litres in a 20 litre container
4 litres in a 4 litre container

For availability of other pack sizes contact International Protective Coatings
Shipping Weight

Storage

U.N. Shipping No. 1263
20 litre unit

32 kg Base (Part A) 4.3 kg Curing Agent (Part B)

Shelf Life

24 months minimum at 25°C (77°F). Subject to re-inspection
thereafter. Store in dry, shaded conditions away from sources
of heat and ignition.

Important Note
The information given in this sheet is not intended to be exhaustive and any person using the product for any purpose other than that specifically

recommended in this sheet without first obtaining written confirmation from us as to the suitability of the product for the intended purpose does so at his
own risk. Any warranty, if given, or specific Terms & Conditions of Sale are contained in International’s Terms & Conditions of Sale, a copy of which can
be obtained on request. Whilst we endeavour to ensure that all advice we give about the product (whether in this sheet or otherwise) is correct we have
no control over either the quality or condition of the substrate or the many factors affecting the use and application of the product. Therefore, unless we
specifically agree in writing to do so, we do not accept any liability whatsoever or howsoever arising for the performance of the product or for any loss or
damage (other than death or personal injury resulting from our negligence) arising out of the use of the product. The information contained in this sheet is
liable to modification from time to time in the light of experience and our policy of continuous product development.
It is the user’s responsibility to check that this sheet is current prior to using the product. Issue date: 03/08/2006
Copyright © International Paint Ltd,

Page 4 of. 4

International and all products mentioned in this publication are trademarks of, or licensed to, Akzo Nobel.