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[.]
BRITIS H S TAND ARD BS AU 69a: 992 IS O 795 : 989 NM — 14A 12 pages Method for D etermination of b urning b ehaviour of interior materials for road vehicles, and tractors and machinery for agriculture and forestry BS AU 169a:1992 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Automobile Standards Policy Committee (AUE/- ) to Technical Committee AUE/1 5, upon which the following bodies were represented: Association of Trailer Manufacturers Caravan Club Department of Transport Metropolitan Police Motor Industry Research Association National Caravan Council Limited Society of Motor Manufacturers and Traders Limited This British Standard, having been prepared under the direction of the Automobile Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on May 992 © BSI 03- 999 First published December 978 Second edition May 992 The following BSI references relate to the work on this standard: Committee reference AUE/1 Draft for comment 87/70299 DC ISBN 580 20825 Amendments issued since publication Amd No Date Comments BS AU 169a:1992 Contents Page Committees responsible Inside front cover National foreword ii Scope Normative reference Definitions Principle Apparatus Samples Procedure Calculation Test report Figure — Example of combustion chamber with sample holder and drip pan Figure — Example of combustion chamber Figure — Typical drip pan Figure — Example of sample holder Figure — Example of section of lower U- frame design for wire support facility Figure — Sample Publication(s) referred to © BSI 03- 999 Inside back cover i BS AU 69a:1 992 National foreword This British Standard has been prepared under the direction of the Automobile Standards Policy Committee and is identical with ISO 3795: 989 “Road v ehicles, and tractors and m achinery fo r agriculture and fores try — Determ ination of b urning b ehav iour o f interior m aterials ”, published by the international Organization for Standardization (ISO) This revision of this standard supersedes BS AU 69: 978 which is withdrawn The revision comprises extension of the title and scope to cover tractors and machinery for agriculture and forestry The technical content of the standard remains unaltered Cross-reference The Technical Committee has reviewed the provisions of ISO 2768- : 989, to which normative reference is made in the text, and has decided that they are acceptable for use in conj unction with this standard 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 Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages to 8, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 03- 999 ISO 3795:1 989 (E) Scope when different materials are connected together This International Standard specifies a method for determining the horizontal burning rate of materials used in the occupant compartment of road vehicles (for example, passenger cars, lorries/trucks, estate cars, coaches), and of tractors and machinery for agriculture and forestry, after exposure to a intermittently (for example, by sewing, high- frequency welding, riveting) , then in order to permit the preparation of individual samples in accordance with clause , such materials will not be considered as composite materials 3.3 small flame exposed side This method permits testing of materials and parts side which faces towards the occupant compartment of the vehicle interior equipment individually or in when the material is mounted in the vehicle combination up to a thickness of mm It is used to j udge the uniformity of production lots of such materials with respect to their burning behaviour Principle A sample is held horizontally in a U- shaped holder Because of the many differences between the real and is exposed to the action of a defined low- energy world situation (application and orientation within flame for s in a combustion chamber, the flame vehicle interior, conditions of use, ignition source, acting on the free end of the sample The test etc ) and the precise test conditions specified in this determines if and when the flame extinguishes or International Standard, this method cannot be the time in which the flame passes a measured considered as suitable for evaluation of all true distance in- vehicle burning characteristics Normative reference Apparatus 5.1 Com b ustion cham b er (see Figure ), preferably The following standard contains provisions which, of stainless steel and having the dimensions given through reference in this text, constitute provisions in Figure The front of the chamber contains a of this International Standard At the time of flame- resistant observation window, which may publication, the edition indicated was valid All cover the front and which can be constructed as an standards are subj ect to revision, and parties to access panel agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below Members of IEC and ISO maintain registers of currently valid International Standards ISO 2768- : 989, General tolerances — The bottom of the chamber has vent holes, and the top has a vent slot all around The combustion chamber is placed on four feet, mm high The chamber may have a hole at one end for the introduction of the sample holder containing the sample; in the opposite end, a hole is provided for Part : Tolerances for linear and angular the gas line Melted material is caught in a pan dim ensions w itho ut indiv idual to lerance (see Figure 3) which is placed on the bottom of the indicatio ns Definitions chamber between vent holes without covering any vent hole area 5.2 Sam p le holder, consisting of two U- shaped metal For the purposes of this International Standard, the plates or frames of corrosion- proof material following definitions apply Dimensions are given in Figure 3.1 The lower plate is equipped with pins, the upper one burning rate with corresponding holes in order to ensure quotient of the burnt distance measured according to this International Standard and the time taken to burn this distance it is expressed in millimetres per minute 3.2 composite material consistent holding of the sample The pins also serve as the measuring points at the beginning and end of the burning distance A support shall be provided in the form of 0, 25 mm diameter heat- resistant wires spanning the frame at 25 mm intervals over the bottom U- shaped frame (see Figure 5) material composed of several layers of similar or different materials intimately held together at their surfaces by cementing, bonding, cladding, welding, etc © BSI 03- 999 ISO 3795:1 989 (E) Figure — Example of combustion chamber with sample holder and drip pan © BSI 03 - 999 ISO 3795:1 989 (E) Figure — Example of combustion chamber Figure — Typical drip pan © BSI 03- 999 ISO 3795:1 989 (E) The plane of the lower side of samples shall 5.3 be 78 mm above the floor plate The distance of the provided by a Bunsen burner having an inside Gas b urner The small ignition source is front edge of the sample holder from the end of the diameter of 9, mm It is located in the test cabinet chamber shall be 22 mm; the distance of the so that the centre of its nozzle is mm below the longitudinal sides of the sample holder from the centre of the bottom edge of the open end of the sides of the chamber shall be 50 mm (all inside sample (see Figure 2) dimensions) (See Figure and Figure ) 5.4 Tes t gas The gas supplied to the burner shall have a calorific value of approximately 38 MJ/m (for example natural gas) Figure — Example of sample holder © BSI 03- 999 ISO 3795:1 989 (E) Figure — Example of section of lower U-frame design for wire support facility 5.5 Metal comb , at least 1 mm in length, with When the shape and dimensions of a product not seven to eight smooth rounded teeth per 25 mm permit taking a sample of the given size, the 5.6 Stop- watch , accurate to 0, s following minimum dimensions shall be 5.7 Fume cupboard The combustion chamber may be placed in a fume cupboard assembly provided maintained: a) For samples having a width of mm to 60 mm, that the internal volume is at least 20 times, but not the length shall be 356 mm In this case, the more than 1 times, greater than the volume of the material is tested in the product width combustion chamber and provided that no single b) For samples having a width of 60 mm height, width, or length dimension of the fume to 00 mm, the length shall be at least 38 mm cupboard is greater than 2, times either of the In this case the potential burning distance other two dimensions corresponds to the length of the sample, the Before the test, the vertical velocity of the air measurement starting at the first measuring through the fume cupboard shall be point measured 00 mm in front of and behind the final c) Samples having a width of less than 60 mm position where the combustion chamber will be and shorter than 356 mm, and samples having a located It shall be between 0, m/s and 0, m/s in width of 60 mm to 00 mm and shorter order to avoid possible discomfort, by combustion than 38 mm, cannot be tested according to this products, to the operator It is possible to use a fume method; neither can samples having a width less cupboard with natural ventilation and an than mm appropriate air velocity Samples 6.1 Shape and dimensions 6.2 Sampling At least five samples shall be taken from the material under test In materials having different burning rates in different material directions The shape and dimensions of samples are given (preliminary tests will show this), the five (or more) in Figure The thickness of the sample samples are to be taken and placed in the test corresponds to the thickness of the product to be apparatus so that the highest burning rate will be tested It shall not be more than mm When measured taking the sample permits, the sample shall have a constant section over its entire length © BSI 03- 999 ISO 3795:1 989 (E) Figure — Sample When the material is supplied in widths, a length of at least 500 mm shall be cut covering the entire width From this, the samples shall be taken so as to be at least 100 mm from the material edge and equidistant from each other Samples shall be taken in the same way from finished products, when the shape of the product permits When the thickness of the product is 13 mm or more, it shall be reduced to 13 mm by a mechanical process applied to the side which does not face the occupant compartment Composite materials (see 3.2 ) shall be tested as if they were of uniform construction In the case of materials made of superimposed layers of different composition which are not composite materials, all the layers of material included within a depth of 13 mm from the surface facing towards the occupant compartment shall be tested individually 7.3 Adjust the gas flame to a height of 38 mm using the mark in the chamber, the air intake of the burner (5.3 ) being closed Before starting the first test, the flame shall burn at least for for stabilization 7.4 Push the sample holder (5.2 ) into the combustion chamber (5.1 ) so that the end of the sample is exposed to the flame, and after 15 s cut off the gas flow 7.5 The measurement of the burning time starts at the moment when the foot of the flame passes the first measuring point Observe the flame propagation on the side burning faster than the other (upper or lower side) 7.6 Measurement of burning time is completed when the flame has come to the last measuring point or when the flame extinguishes before coming to the last measuring point If the flame does not reach the last measuring point, measure the burnt distance up to the point where the flame 6.3 Conditioning extinguished Burnt distance is the decomposed The samples shall be conditioned for at least 24 h part of the sample, which is destroyed on its surface but not more than days at a temperature or in the interior by burning of 23 °C ± °C and a relative humidity Insofar as the sample does not ignite or does not of 50 % ± % and shall be maintained under these 7.7 continue burning after the burner has been conditions until immediately prior to testing extinguished, or when the flame extinguishes before reaching the first measuring point, so that no Procedure burning time is measured, note in the test report 7.1 Place samples with napped or tufted surfaces on that the burning rate is mm/min a flat surface and comb twice against the nap using 7.8 When running a series of tests or repeat tests, the comb (5.5 ) ensure that the combustion chamber and sample 7.2 Place the sample in the sample holder (5.2 ) so holder have a maximum temperature of 30 °C that the exposed side will be downwards to the before starting the next test flame © BSI 03-1999 ISO 3795:1 989 (E) Calculation The burning rate, d) preparation of the sample, including the B, in millimetres per minute, is given by the formula B = transverse) ; f) number of samples tested: g) test results: is the burnt distance, in millimetres; is the time, in seconds, to burn distance greater than mm) according to 6.2 ; e) position of sample in the product (lengthwise, s × 60 t where s t method of reducing the thickness (if thickness is s — burnt distance, in millimetres, and burning time, in seconds; — other observations (self- extinguishing, etc ); Test report The test report shall include the following particulars: a) type, marking and colour of the test sample; b) whether the sample was a composite or a single material; c) dimensions of the sample, including maximum h) all calculated single values of burning rate, in millimetres per minute; i) special test conditions (use of fume cupboard, use of ventilator, etc ); j ) any conditions different from those specified in this International Standard; k) date of test and minimum values of thickness; © BSI 03- 999 blank BS AU 69a:1 992 Publication(s) referred to See national foreword © BSI 03- 999 | | | | | | | | | 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 | | | | | | | | 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