Bsi bs au 169a 1992 (1999) iso 3795 1989

BRITISH STANDARD BS AU 169a 1992 ISO 3795 1989 NM — 14A 12 pages Method for Determination of burning behaviour of interior materials for road vehicles, and tractors and machinery for agriculture and f[.]

ISO 3795:1989

NM— 14A

1 p g es

This Bri sh Stan ard, ha ing

b en pre ared u der the

directonof the Automo ile

Stan ards Policy Commi e ,

waspublished u der the

authoriyof the Stan ards

Bo rdan comes into efect on

1 Ma 1 9

© BSI 0 -1 9

Fir t published Decemb r1 7

Secon edi on Ma 1 9

The folowing BSI references

relate to the work on this

stan ard:

Commi e reference AUE/15

Draft for comment 8 / 70 9 DC

ISBN 0 5 0 2 8 5 7

The prep ration of this British Stand rd was entrusted b the Automobi e

Stand rds Pol cy Commit e ( AUE/-) to Tech ical Commit e AUE/15, upon

which the fol owing bod ies were represented :

Association of Traier Man facturer

Carav an Club

Dep rtment of Transport

Metropol tan Polce

Motor Ind ustry Resear h Association

National Carav an Cou ci Limited

Society of Motor Man facturer and Tra er Limited

Am endm ents is ued sinc publ cation

Pag e

Fig ure 1 — Ex mple of combustion chamber with sample hold er

Fig ure 5 — Ex mple of section of lower U-f ame desig n for wire

National foreword

This British Stand ard has be n prep red u der the direction of the Automobie

Stand rds Polcy Commit e and is id entical with ISO3 9 :19 9 “R oa d vehicle ,

a nd tr a ctor s a nd ma chiner y f r a gr iculur e a nd fr estr y — Deter mina tion o

bur ning beha viour o inter io ma ter ia ls”, publshed b the international

Org anization for Stand rdization ( ISO)

This rev ision of this stand rd super ed es BSAU16 :19 8 which is withdrawn

The rev ision comprises extension of the title an s ope to cov er tractor and

machinery for ag riculture and forestry The tech ical content of the stand ard

remains u altered

Cros - referenc The Tech ical Commit e has rev iewed the prov isions of

ISO27 8-1:19 9, to which normativ e reference is mad e in the text, and has

d ecided that they are ac epta le for use in conju ction with this stand rd

A British Stand ard d oes not purport to includ e al the neces ary prov isions of a

contract User of British Stand rd s are responsible for their cor ect a plcation

Com pl anc with a British Standard does not ofitself confer im m unity

f om leg al o l g ations

Sum mary of pag es

This document comprises a f ont cov er, an insid e font cov er, p g es i an i ,

p g es1 to 8, an insid e b ck cov er an a b ck cov er

This stand rd has be n up ated ( se copy rig ht d ate) an ma hav e ha

amendments incorporated This wi l be ind icated in the amendment ta le on

theinside f ont cov er

1 Scope

This International Stand rd specifies a method for

determining the horiz ntal burning rate of

materials used in the oc up nt comp rtment of road

v ehicles ( for ex ample, p s eng er car , lor ies/trucks,

estate car , coaches),and of tractor an machinery

for ag riculture an forestry , after ex osure to a

smal flame

This method permits testing of materials an p rts

of the v ehicle interior equipment indiv id ualy or in

combination up to a thick es of13mm It is used to

jud g e the u iformity of production lots of such

materials with respect to their burning behav iour

Because of the many d iferences betwe n the real

world situation ( ap l cation and orientation within

v ehicle interior, conditions of use, ig nition sour e,

etc.) and the precise test conditions specified in this

International Stand ard , this method cannot be

considered as suita le for ev aluation of al true

in-v ehicle burning characteristic

The fol owing stand ard contains prov isions which,

throug h reference in this text, constitute prov isions

of this International Stand ard At the time of

publcation, the edition indicated was v ald All

stand ards are subject to rev ision, and p rties to

ag re ments b sed on this International Stand rd

are encourag ed to inv estig ate the pos ibi ty of

a ply ing the most recent edition of the stand rd

indicated below Member of IEC and ISO maintain

reg ister of cur ently v ald International Stand ards

ISO 27 8-1:19 9, Gener a l toler a nc s —

Pa r t1: Toler a nc s f r lnea r a nd a ngula r

d imensions wihout ind ivid ua l toler a nc

ind ica tions

3 Definitions

For the purposes of this International Stand rd , the

fol owing d efinitions a ply

3.1

burning rate

q uotient of the burnt distance measured ac ording

to this International Stand rd and the time taken to

burn this distance

it is ex res ed in mi lmetres per min te

3.2

composite m aterial

material composed of sev eral lay er of simiar or

diferent materials intimately held tog ether at their

sur aces b cementing , bond ing , cla d ing , welding ,

etc

when diferent materials are con ected tog ether

intermit ently ( for ex mple, b sewing ,

hig h-f eq uency welding , riv eting ), then in order to

permit the prep ration of ind iv idual samples in

ac ord ance with clause6,such materials wi not be

consid ered as composite materials

3.3

ex osed side

side which faces towards the oc up nt comp rtment

when the material is mou ted in the v ehicle

4 Principle

A sample is held horiz ntaly in a U-sha ed holder

and is ex osed to the action of a defined low-energ y

flame for15s in a combustion chamber, the flame

acting on the fe en of the sample The test

determines if and when the flame exting uishes or

the time in which the flame p s es a measured

distance

5.1 Combuston cha mber ( se Fig ure 1), prefera ly

of stainles ste l and hav ing the d imensions g iv en

inFig ure 2 The f ont of the chamber contains a

flame-resistant observ ation window, which ma

cov er the f ont and which can be constructed as an

ac es p nel

The bot om of the chamber has v ent holes, and the

top has a v ent slot al arou d The combustion

chamber is placed on four fe t,10mm high

The chamber ma hav e a hole at one end for the

introduction of the sample holder containing the

sample; in the op osite end, a hole is prov id ed for

the g as l ne Melted material is caug ht in a p n

( se Fig ure 3) which is placed on the bot om of the

chamber betwe n v ent holes without cov ering any

v ent hole area

5.2 Sa mple hold er ,consisting of two U-sha ed metal

plates or fames of cor osion-pro f material

Dimensions are g iv en inFig ure 4

The lower plate is eq uip ed with pins, the up er one

with cor esponding holes in ord er to ensure

consistent hold ing of the sample The pins also serv e

as the measuring points at the beg in ing and end of

the burning d istance

A sup ort shal be prov ided in the form of0,25mm

diameter heat-resistant wires sp n ing the f ame

at 25mm interv als ov er the bot om U-sha ed f ame

( se Fig ure 5)

Fig ure 1 — Ex mple of combustion cham ber with sam ple holder and drip pan

Fig ure 2 — Ex mple of com bustion chamber

Fig ure 3 — Ty ical drip pan

The plane of the lower side of samples shal

be17 mm a ov e the flo r plate The d istance of the

f ont ed g e of the sample holder fom the end of the

chamber shal be2 mm; the distance of the

long itud inal sid es of the sample hold er f om the

sid es of the chamber shal be5 mm ( al inside

d imensions) ( Se Fig ure 1 andFig ure 2.)

5.3 Ga s bur ner The smal ig nition sour e is

prov id ed b a Bu sen burner hav ing an inside

d iameter of9,5mm It is located in the test ca inet

so that the centre of its no zle is19mm below the

centre of the bot om edg e of the open end of the

sample ( se Fig ure 2)

5.4 Te t ga s The g as sup l ed to the burner shal

hav e a calorific v alue of a proximately3 MJ/m

3

( for ex mple natural g as)

Fig ure 4 — Ex mple of sample holder

5.5 Meta l comb, at least1 0mm in leng th, with

sev en to eig ht smo th rou ded te th per25mm

5.6 Stop-wa tch, ac urate to0,5s

5.7 Fume cup oa r d The combustion chamber ma

be placed in a fume cup oard as embly prov ided

that the internal v olume is at least20 times, but not

more than1 0 times, g reater than the v olume of the

combustion chamber an prov ided that no sing le

heig ht, width, or leng th d imension of the fume

cup oard is g reater than2,5 times either of the

other two dimensions

Before the test, the v ertical v elocity of the air

throug h the fume cup oard shal be

measured10 mm in f ont of and behind the final

position where the combustion chamber wi be

located It shal be betwe n0,1m/s and0,3m/s in

ord er to av oid pos ible d is omfort, b combustion

products, to the operator It is pos ible to use a fume

cup oard with natural v enti ation and an

a propriate air v elocity

6 Samples

6.1 Sha e and dim ensions

The sha e an d imensions of samples are g iv en

inFig ure 6 The thick es of the sample

cor esponds to the thick es of the product to be

tested It shal not be more than13mm W hen

taking the sample permits, the sample shal hav e a

constant section ov er its entire leng th

W hen the sha e and dimensions of a product do not

permit taking a sample of the g iv en siz , the

folowing minimum dimensions shal be

maintained:

a) For samples hav ing a wid th of3mm to6 mm,

the length shal be3 6mm In this case, the

material is tested in the product width

b) For samples hav ing a wid th of6 mm

to10 mm, the leng th shal be at least13 mm

In this case the potential burning d istance

cor esponds to the leng th of the sample, the

measurement starting at the fir t measuring

point

c) Samples hav ing a wid th of les than6 mm

and shorter than3 6mm, and samples hav ing a

width of6 mm to10 mm and shorter

than13 mm, can ot be tested ac ording to this

method; neither can samples hav ing a wid th les

than3mm

6.2 Sam pl ng

At least fiv e samples shal be taken f om the

material u d er test In materials hav ing d iferent

burning rates in diferent material directions

( prelminary tests wi show this), the fiv e ( or more)

samples are to be taken an placed in the test

a p ratus so that the hig hest burning rate wi be

measured

Fig ure 5 — Exam ple ofse tion of lower U- fram e desig n for wire support faci ity

W hen the material is sup l ed in wid ths, a leng th of

at least5 0mm shal be cut cov ering the entire

width.From this, the samples shal be taken so as to

be at least10 mm f om the material edg e and

equidistant fom each other

Samples shal be taken in the same wa fom

finished products, when the sha e of the product

permits W hen the thick es of the prod uct

is13mm or more, it shal be reduced to13mm b a

mechanical proces a pled to the side which do s

not face the oc up nt comp rtment

Composite materials ( se 3.2) shal be tested as if

they were of u iform construction

In the case of materials ma e of superimposed

lay er of d iferent composition which are not

composite materials, al the lay er of material

includ ed within a d epth of13mm f om the sur ace

facing towards the oc up nt comp rtment shal be

tested ind iv id ualy

6.3 Conditioning

The samples shal be conditioned for at least24h

but not more than7 d y s at a temperature

of23°C±2 °C and a relativ e h midity

of5 %±5% and shal be maintained u der these

cond itions unti immediately prior to testing

7.1Place samples with na ped or tufted sur aces on

a flat sur ace and comb twice ag ainst the na using

the comb ( 5.5)

7.2 Place the sample in the sample holder ( 5.2) so

that the ex osed side wi be d ownwards to the

flame

7.3 Ad just the g as flame to a heig ht of3 mm using

the mark in the chamber, the air intake of the

burner ( 5.3) being closed Before starting the fir t

test, the flame shal burn at least for1 min for

sta i ization

7.4 Push the sample hold er ( 5.2) into the

combustion chamber (5.1) so that the en of the

sample is ex osed to the flame, and after15s cut of

the g as flow

7.5 The measurement of the burning time starts at

the moment when the fo t of the flame p s es the

fir t measuring point Observ e the flame

prop g ation on the side burning faster than the

other ( up er or lower sid e)

7.6 Measurement of burning time is completed

when the flame has come to the last measuring

point or when the flame exting uishes before coming

to the last measuring point I the flame d oes not

reach the last measuring point, measure the burnt

d istance up to the point where the flame

exting uished Burnt distance is the d ecomposed

p rt of the sample, which is d estroy ed on its sur ace

or in the interior b burning

7.7 Insofar as the sample do s not ig nite or do s not

continue burning after the burner has be n

exting uished, or when the flame ex ting uishes before

reaching the fir t measuring point, so that no

burning time is measured , note in the test report

that the burning rate is0mm/ min

7.8 W hen ru ning a series of tests or repeat tests,

ensure that the combustion chamber and sample

holder hav e a ma imum temperature of3 °C

before starting the next test

Fig ure 6 — Sam ple

8 Calculation

The burning rate, B , in mi lmetres per min te, is

g iv en b the formula

where

9 Test r port

The test report shal includ e the folowing

p rticular :

a) ty pe, marking and colour of the test sample;

b) whether the sample was a composite or a sing le

material;

c) d imensions of the sample, including ma imum

an minimum v lues of thick es ;

d) prep ration ofthe sample, includ ing the

method of reducing the thick es ( if thick es is

g reater than13mm) ac ording to6.2;

e) position of sample in the product ( leng thwise,

transv er e);

f) number of samples tested:

g ) test results:

— burnt distance,in mi lmetres, and burning

time, in seconds;

— other observ ations ( self-exting uishing , etc.);

h) al calculated sing le v lues of burning rate, in

mi lmetres per min te;

i special test conditions ( use of fume cup oard ,

use of v enti ator, etc.);

j) any cond itions d iferent f om those specified in

this International Stand rd;

k) d ate of test

s is the burnt distance, in mi lmetres;

t is the time, in second s, to burn d istance s

B

s

t

- ×6

=

Publication(s) referred to

Se national foreword

3 9Ch isw i ckH i g hR oa

Lon don

W44 AL

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