Bsi bs au 242a 1998 (1999)

BRITISH STANDARD AUTOMOBILE SERIES

|
|
|
|
|

BS AU
242a:1998

|
|
|

Inco rp o rating

|
|
|
|
|
|
|
|

Automotive windscreen
repair Ð Code of
practice

|

|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|

|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|

|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|

|
|
|
|
|
|
|
|
|

IC S 43 . 040 . 6 0

|
|
|
|
|
|
|
|

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

|
|
|
|
|

Amendment No .

1


BS AU 242a:1998

Issue 2, March 1 999

Committees responsible for this
British Standard
The preparation of this British Standard was entrusted to Technical C ommittee
AUE /1 0, Safety glass for land transport, upon which the following bodies were
represented:

Association of British Glass Repair Operators
Automobile Association
British Plastic Federation
C onsumer Policy C ommittee of BSI
Department of the E nvironment, Transport and the Regions Ð C entral Transport
Group
Flat Glass Manufacturers' Association
Automotive Glazing E xecutive (Glass and Glazing Federation)
National C aravan C ouncil Limited
Society of Motor Manufacturers and Traders Limited
Transport Research Laboratory
Windscreen and Glass Repairers' Association
Windscreen Repair E quipment Manufacturers and Suppliers Association

This B ritis h Standard,

having

b e e n p re p are d unde r the
dire ctio n o f the E ngine e ring
Se cto r C o mmitte e ,

was p ub lishe d

unde r the autho rity o f the
Standards C o mmitte e and c o me s
into e ffe c t o n
1 5 D e c e mb e r 1 9 9 8

©

B SI 0 3 -1 9 9 9

Firs t p ub lishe d as B S AU 2 42

Amendments issued since publication
Amd. No.

Date

Text affected

1 041 9

March 1 999

Indicated by a sideline

N o ve mb e r 1 9 9 1

The fo llo wing B SI re fe re nce s
re late to the wo rk o n this
standard:
C o mmitte e re fe re nc e AUE /1 0
D raft fo r co mme nt 9 8/7062 9 0 D C

ISBN 0 580 28209 0


BS AU 242a:1998

Issue 1, March 1999

Summary of pages
The following table identifies the current issue of each page. Issue 1 indicates that a page has been introduced
for the first time by amendment. Subsequent issue numbers indicate an updated page. Vertical sidelining on
replacement pages indicates the most recent changes (amendment, addition, deletion).

Page

Issue

Page

Issue

Front cover
Inside front cover
a
b

2
2
1
blank

i
ii
1 to 5

original
2

© BSI 03-1 999

Back cover

original
original

a


b

blank

BS AU 242a:1998

Contents
Page
Committees responsible

© BSI 1 998

Inside front cover

Foreword

ii

1

Scope

1

2

Normative references

1

3

General

1

4

Procedure

1

5

Quality assessment

2

6

Training

2

7

Report and record keeping

2

Annex A (informative) Windscreen damage identification

3

Annex B (informative) Windscreen zones

4

Bibliography

5

Figure A.1 Ð Types of windscreen damage

3

Figure B.1 Ð Windscreen zones

4

Table B.1 Ð Windscreen zones and permitted repairs

5

i


Issue 2, March 1999

B S A U 2 42 a:1 998

F o re wo rd

This British Standard has been prepared under the direction of the Automobile
Standards Policy Committee. It is based on proposals from the Glass and Glazing
Federation and the Association of British Glass Repair Operators and the Windscreen
Repair Equipment Manufacturers and Suppliers Association.
This British Standard is a revision of BS AU 242:1991, which is withdrawn.

|

There is an established practice to repair minor stone impact damage to windscreens
using some form of plastics resin. This practice, while not fully restoring a windscreen
to its original condition, is practicable because:
a) it improves the appearance of the damaged area and its optical quality;
b) it restores a smooth surface to damaged areas that may otherwise interfere with
windscreen wipers;
c) it prevents further deterioration (e.g. moisture ingress).
This standard has been prepared taking into account the requirements for glazing and
visibility in the Road Vehicles (Construction and Use) Regulations 1986. It gives
procedures that should be adopted for carrying out repairs and general guidance on
the type of materials to be used.
Performance requirements for windscreen repair systems, including materials, for
carrying out repairs in accordance with this British Standard are given in
BS AU 251:1994, Specification for performance of automotive laminated windscreen
repair systems.
Compliance with this British Standard can only be achieved with systems and
materials conforming to BS AU 251.
Examples of types of windscreen damage are given in annex A and details of the size
of damage that can be repaired in different areas of the windscreen are given in
annex B.
A British Standard does not purport to include all the necessary provisions of a

contract. Users of British Standards are responsible for their correct application.
C o mp lianc e wi t h a B ritis h S tandard doe s not o f its e lf c o nfe r im m un it y
fro m le gal o b ligatio ns.

ii

© BSI 03-1 999


B S A U 2 42 a: 1 998

1 S cope
This

4 P ro c e d ure

B ritish

S tandard

fo r re p airing

give s

laminate d

re co mme nde d

winds c re e ns

p rac tic e s

damage d

N O TE

The

fo llo wing

Ð c le anline s s

imp acts .

It ap p lie s

to

he avy go o ds

ve hicle s

and

p as se nge r c ars .

Re c o mme ndatio ns

the

the

typ e

and

quality o f the
Ð o p e rating

include :

siz e

o f the

o f damage

that

c an

damage d

the

quality o f winds cre e n

are a (dirt

damage d are a re duce

Ð mo isture

a)

affe ct

and

fo re ign

matte r

(HG Vs) ,
ins ide

c o ac he s

facto rs

re p airs :

by

the

b o nding

stre ngth

and

vis io n

re p air) ;

c o nditio ns

p rio r to

co ntaminatio n

and

(whic h

during

give s

the

re p air;

a milky

ap p e arance ) ;

be
Ð the

time

b e twe e n

damage

and

re p air (p ro mp t

re p airs

are

re p aire d;

b)

the

are a o n

the

p artic ular typ e s

winds cre e n

and

siz e

c an

in

be

whic h

re p airs

of

p articularly imp o rtant

in

Ð the

state d

manufac ture r' s

p ro c e dure s

fo r the

s te p s

to

e)

re p o rts

ass e s s

fo r the

winds cre e n

re p air

te mp e rature

(lo w

glass

te mp e rature s

can

c aus e

re p aire r;
inc o mp le te

d)

s he lf life

mate rial;

made ;

Ð the

c)

z o ne A) ;

the

quality o f finishe d

filling

te mp e rature s

re p airs;

o f the

c an c aus e

damage d
the

are a and

damage

to

high

e xte nd

glas s

and

de laminatio n) .

re te ntio n

This

and

b y the

s tandard

glaz ing

re c o rds

s uc h

glas s±p las tic s

and

4. 1 G e ne ral

re p aire r.

do e s

as

fo r co mp le tio n

no t ap p ly to

b ulle t-re s is tant

s p e c ial

glaz ing

typ e s

The

of

re p air s ho uld

mate rials

and

s ho uld

c o nfo rm

c o nfo rm

kit manufac ture r' s

glaz ing.

5.2

to

to

5 .6.

to

S yste ms

B S AU 2 5 1 .

instruc tio ns

s ho uld

Any

be

and

re p air

fo llo we d.

4. 2 R e m o val o f d irt c o n tam in atio n

2 N o rm ative re fe re n c e s
The

fo llo wing

p ro visio ns
c o nstitute
date d

no rmative

that,

thro ugh

p ro vis io ns

re fe re nc e s ,

re vis io ns

o f,

Fo r undate d
p ub licatio n

D irt and

do c ume nts
re fe re nc e

o f this

in

B ritish

this

S tandard.

any o f the s e
re fe re nc e s ,

re fe rre d

to

p ub lic atio ns

the

do

to ,

no t

late s t e ditio n

fro m

(e . g. s c rap ing,

te xt,

s ub s e que nt amandme nts

o the r fo re ign

re mo ve d

co ntain

matte r sho uld

damage d

ab rading,

Fo r

C are

or

(e s p e c ially whe n

ap p ly.

sho uld

the

be

take n

are a b y

and,

no t to

be

c o mp le te ly

c are ful

if ne c e ss ary,

p e ne trate

c le aning

drilling) .

the

inte rlaye r

drilling) .

4. 3 R e m o val o f wa t e r c o ntam inatio n

o f the
Any mo isture

ap p lie s.

Specification for performance of
automotive laminated windscreen repair systems

re mo ve d

in

the

p rio r to

damage d

carrying

are a s ho uld

o ut

the

be

re p air.

B S AU 2 5 1 : 1 9 9 4,

N O TE 1

.

a ho t

C are

3 G e ne ral

Wate r c o ntaminatio n

s ho uld

dry until
N O TE 2

3.1

The

typ e

re p aire d

and

sho uld

p o sitio n

o f the

s iz e

be

o f damage

limite d

damage

as

on

that

c an

a functio n

the

be

The

sho uld

Ð

de gre e

o f the

o f damage

be

as

fo llo ws :

z o ne

A:

damage

that c an

z o ne s

be

z o ne

B:

If the

re p aire d

ide ntifie d

in

within

a c irc le 1 0 mm

a c irc le 1 5 mm

in

damage

within

a c irc le 2 5 mm

in

damage

within

a c irc le 40 mm

in

a)

s e ats ,

the y do

up

and

co ache s

to 1 5 0 mm

no t e xte nd fro m

Re p airs

le s s

an

in

with

mo re

le ngth

e dge

than 1 0 0 mm

to

may

an

than
be

e dge

e ight

p as se nge r

re p aire d,
o f the

ap art sho uld

p ro vide d

winds cre e n.

no t

be

carrie d

o ut.

3.3

be

sho uld

o nly b e

c o mp e te nt re p aire rs

c arrie d
(s e e

o ut

clause

by

7) .

b)

damage

s ho uld

1 998

be

no t

ke p t

dry,

white ning

co nfo rming

o ut with
range 1 0

to

the

8C

o f the

B S AU 2 5 1

glass

to 2 5

manufac ture r' s

to

re garding

c o mp lie d

are as

anne x B

e xte nding

no t

be

8C

o r as

instruc tio ns .

the

typ e

and

s iz e

with:

on

windsc re e ns

re garding

p o sitio n

and

thro ugh

c o ns ide re d

all

laye rs

re p airab le

in

o f glass
any

are a o f

windsc re e n;
c)

damage

with

a crate r at the
in

p o int

diame te r s ho uld

o f imp act
no t

be

re p airab le ;

fully
d)

if damage ,

winds c re e n

BSI

are a re mains

limitatio n;

de laminatio n

c o ntaminatio n

©

the

o f damage d

c o nfo rm

c o ns ide re d
Re p airs

c arrie d

re s tric tio ns

e xce e ding 5 mm

traine d,

kits

re p air kit

s ho uld

re p airs

siz e

Fo r HGVs
c rac ks

are a is

damage d

re p air.

inte rlaye r o c curs .

e ithe r in

fo llo wing

s ho uld

diame te r.

N O TE

that the

o f the

4. 6 T yp e , s iz e and c o nditio ns o f d am age

in

diame te r;

D:

of

us e d.

the

Ð

z o ne

(PVB )

s ho uld

o f damage

Ð

damage d

te mp e rature

in

The

C:

use

4. 5 T e m p e rature lim itatio n

diame te r;

z o ne

b y care ful

in

anne x B

state d

damage

be

Re p airs

within

re mo ve d

4. 4 M ate rials

(se e

diame te r;

Ð

take n

O nly re p air re sin-mix

windsc re e n

be

o f the

windsc re e n

s ho uld

e ac h

be

c o mp le tio n

p o lyvinyl b utyral

anne xe s A and B ) .

3.2

may

air b lo we r.

o f the

s ho uld

o r irre ve rs ib le

inte rlaye r has

no t

be

o c c urre d,

c o ns ide re d

the

re p airab le .

1


BS AU 242a:1998

5 Quality assessment

7 Report and record keeping

The repairer should inspect the repaired area to
ensure it conforms to a) to c).

The repairer should make and retain a record of the
following:

a) Repairs should not show significant optical
defects. The damaged area should be clear, but
small imperfections may be acceptable.
Visual inspections should be carried out from the
inside of the vehicle, under good illumination from
a distance of 230 mm with normal corrected vision.

a) the invoice number;
b) date of repair;
c) date of invoice if different from the date of

repair;
d) the name and address of the repair
organization;

If after the repair a residual small dull spot is
visible in the damaged area, the spot should not
exceed 5 mm in diameter.

f) the name and address of the customer;

b) Repaired areas should be free of voids, air
bubbles or foreign materials.

g) the registration number, make and model of
vehicle;

c) Repaired areas should not interfere with
windscreen wiper function.

h) details of work carried out;

e) identification of repairer;

i) the type and location of damage (see annex B).
NOTE

6 Training

The purpose of this recommendation is to assist quality

control and to provide protection against liability.

Professional repairers should be trained and certified
by the manufacturer of the repair system or their
approved representative to be competent in carrying
out repairs conforming to this standard.

2

© BSI 1 998


BS AU 242a:1998

Annex A (informative)
Windscreen damage identification
Types of windscreen damage are shown in Figure A.1.

a) B e e ' s wing

b ) C o m b inatio n

c ) C lo ve r le af

d) S tar b re ak

e ) B ull' s e ye

f) H alf m o o n

1 5 0 m m m ax.

g) C rac k

NOTE

Repairs to damage g) apply to HGV and coach windscreens only (see note to 3.2 ).

Figure A.1 Ð Types of windscreen damage

© BSI 1 998

3


BS AU 242a:1998

Annex B (informative)
Windscreen zones
B.1

Windscreen zones A,

B.2

For passenger cars,

centre

of the

wipers;

B.3

see

B,

C

and D

zone A is 2 90 mm wide,

or single

passing through the

and described in Table B. 1 .

centred on a longitudinal vertical plane

arc

described by the

driver's

passing

wiper [ vehicles

through the

with two

windscreen

wiper [ Figure B. 1 b) ] .

For HGVs and coaches with two

wiper [ see

shown in Figure B. 1

driver's seat and bounded by the

Figure B. 1 a) ]

vertical p lane

are

windscreen wipers,

centre

of the

zone

A is 350 mm wide,

driver's seat and bounded by the

centred on a longitudinal

arc

described by the

driver's

Figure B. 1 c) ] .

D ime nsio ns

in

millime tre s

290
D

B

a)

A

Pass e nge r car with

B

two

windsc re e n

C

wip e rs

290
Vertical plane
through mirror

A

B

D

C

B
D

b)

Pas se nge r c ar with

s ingle

winds cre e n

wip e r

Figure B.1 Ð Windscreen zones

4

©

BSI

1 998


BS AU 242a:1998

D ime nsio ns

in

millime tre s

350
D

B

b)

A

HGV and c o ac h (two

B

C

winds cre e n

C

wip e rs )

Figure B. 1 Ð Windscre e n zones

(continued)

Table B. 1 Ð Windscre e n zones and p e rmitte d re p airs
Z o ne

Are a

B.2 , B.3

P e rm itt e d re p air

A

see

and Figure B. 1

B

area wiped on driver's side,

C

area wiped on passenger's side,

D

area excluding zones A,

N O TE 1

Fo r HGV and c o ach winds c re e ns,

N O TE 2

Re p airs

le s s

than 1 0 0 mm

ap art

B

excluding zone A

excluding

zone B

and C

damage

s ho uld

up

no t

to 1 50 mm

be

carrie d

in

o ut

le ngth

(se e

damage

within a circle 1 0 mm in

diameter

damage

within a circle 1 5 mm in diameter

damage

within a circle 25 mm in diameter

damage

within a circle 40 mm in diameter

may b e

re p aire d

(s e e

3.2) .

3.2) .

Bibliography
Road Vehicles (C onstruction and Use)
Regulations 1 986.

©

BSI

1 998

5


|
|
|
|
|
|
|
|
|

BSI Ð British Standards Institution

|
|

|
|
|
|
|

BSI is the independent national body responsible for preparing British Standards. It

|
|
|
|
|
|
|

presents the UK view on standards in E urope and at the international level. It is
incorporated by Royal Charter.

Revisions

|
|
|
|

British Standards are updated by amendment or revision. Users of British Standards
should make sure that they possess the latest amendments or editions.

|

|
|

It is the constant aim of BSI to improve the quality of our products and services. We

|
|
|
|
|
|
|
|

would be grateful if anyone finding an inaccuracy or ambiguity while using this
British Standard would inform the Secretary of the technical committee responsible,
the identity of which can be found on the inside front cover. Tel: 02 0 8996 9000.
Fax: 02 0 8996 7400.

|
|

BSI offers members an individual updating service called PLUS which ensures that

|
|
|
|
|
|

|
|
|
|

subscribers automatically receive the latest editions of standards.

Buying standards
Orders for all BSI, international and foreign standards publications should be
addressed to Customer Services. Tel: 02 0 8996 9001 . Fax: 02 0 8996 7001 .

|
|
|
|

In response to orders for international standards, it is BSI policy to supply the BSI
implementation of those that have been published as British Standards, unless

|
|
|
|
|
|

otherwise requested.

Information on standards

|
|
|
|
|
|
|
|
|

BSI provides a wide range of information on national, E urop ean and international
standards through its Library and its Technical Help to E xporters Service. Various
BSI electronic information services are also available which give details on all its
products and services. Contact the Information C entre. Tel: 02 0 8996 71 1 1 .
Fax: 02 0 8996 7048.

|
|
|

Subscribing members of BSI are kept up to date with standards developments and

|
|
|
|
|
|
|
|

|

receive substantial discounts on the purchase price of standards. For details of
these and other benefits contact Membership Administration. Tel: 020 8996 7002.
Fax: 02 0 8996 7001 .

Copyright

|
|

Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of

|
|

the publications of the international standardization bodies. E xcept as permitted

|
|
|
|
|
|

under the C opyright, D esigns and Patents Act 1 988 no extract may be reproduced,
stored in a retrieval system or transmitted in any form or by any means ± electronic,
photocop ying, recording or otherwise ± without p rior written permission from BSI.

|

|
|
|

This does not preclude the free use, in the course of implementing the standard, of
necessary details such as symbols, and size, type or grade designations. If these

|
|

details are to be used for any other purpose than implementation then the prior

|
|

written permission of BSI must be obtained.

|
|
|
|
|
|
|
|
|
|
|
|
|

|
|

BSI

|
|

389 C hiswick High Road

|
|

London

|
|

W4 4AL

|
|
|
|
|
|
|

If permission is granted, the terms may include royalty payments or a licensing
agreement. Details and advice can be obtained from the Copyright Manager.

Tel: 02 0 8996 7070.