SIST EN ISO 6942:2002

SLOVENSKI STANDARD
SIST EN ISO 6942:2002
01-november-2002
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Protective clothing - Protection against heat and fire - Method of test: Evaluation of
materials and material assemblies when exposed to a source of radiant heat (ISO
6942:2002)
Schutzkleidung - Schutz gegen Hitze und Feuer - Prüfverfahren: Beurteilung von
Materialien und Materialkombinationen, die einer Hitze-Strahlungsquelle ausgesetzt sind
(ISO 6942:2002)
Vetements de protection - Protection contre la chaleur et le feu - Méthode d'essai:
Evaluation des matériaux et assemblages des matériaux exposés a une source de
chaleur radiante (ISO 6942:2002)
Ta slovenski standard je istoveten z: EN ISO 6942:2002
ICS:
13.340.10 Varovalna obleka Protective clothing
SIST EN ISO 6942:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN ISO 6942
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2002
ICS 13.340.10 Supersedes EN 366:1993
English version
Protective clothing - Protection against heat and fire - Method of
test: Evaluation of materials and material assemblies when
exposed to a source of radiant heat (ISO 6942:2002)
Vêtements de protection - Protection contre la chaleur et le Schutzkleidung - Schutz gegen Hitze und Feuer -
feu - Méthode d'essai: Evaluation des matériaux et Prüfverfahren: Beurteilung von Materialien und
assemblages des matériaux exposés à une source de Materialkombinationen, die einer Hitze-Strahlungsquelle
chaleur radiante (ISO 6942:2002) ausgesetzt sind (ISO 6942:2002)
This European Standard was approved by CEN on 12 November 2001.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6942:2002 E
worldwide for CEN national Members.

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EN ISO 6942:2002 (E)
Contents
1 Scope .4
2 Normative reference .4
Terms and definitions.5
4 Principle.5
4.1 Method A.5
4.2 Method B.5
5 Apparatus .6
5.1 General.6
5.2 Source of radiation .6
5.3 Specimen holder .7
5.4 Calorimeter .7
5.5 Temperature recorder.9
5.6 Apparatus location .9
6 Sampling.10
7 Test conditions .10
7.1 Conditioning atmosphere .10
7.2 Testing atmosphere.10
7.3 Heat flux density .10
8 Test method.10
8.1 Preliminary measures.10
8.2 Calibration of the radiant source.11
8.3 Test A .11
8.4 Evaluation A .12
8.5 Test B .12
8.6 Evaluation B .12
9 Test report .13
Annex A (informative) Precision of method B . Error! Bookmark not defined.
Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other
provisions of EU Directives. .15
2

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EN ISO 6942:2002 (E)
Foreword
This document (ISO 6942:2002) has been prepared by Technical Committee ISO/TC 94 “Personal safety -
Protective clothing and equipment” in collaboration with Technical Committee CEN/TC 162 “Protective clothing
including hand and arm protection and lifejackets”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by December 2002, and conflicting national standards shall be withdrawn at the latest
by December 2002.
This document supersedes EN 366:1993.
This document has been prepared under a mandate given to CEN by the European Commission and the European
Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.
Annex A is informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,
Sweden, Switzerland and the United Kingdom.
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EN ISO 6942:2002 (E)
Introduction
Protective clothing against radiant heat is worn at different occasions and accordingly the radiation intensity
(characterised by the heat flux density) acting on the clothing material extends over a wide range. This European
Standard describes two test methods which can be applied to all sorts of materials, but, according to the intended
use of the material, the heat flux density has to be chosen properly and the results have to be interpreted correctly,
Industrial workers or fire fighters may be exposed to a relatively low radiation intensity over a long period of time.
On the other hand, industrial workers or fire fighters may be exposed to medium radiation intensities for relatively
short periods of time or to high radiation intensities for very short periods of time. In the latter case, the clothing
material may be changed or even destroyed.
The materials for the protective clothing should be tested at medium and high heat flux densities. The reaction on
method A and the times t and t and transmission factor measured with method B characterise the material.
12 24
Information of the precision of method B see annex A.
1 Scope
This European Standard specifies two complementary methods (method A and method B) for determining the
behaviour of materials for heat protective clothing subjected to heat radiation.
These tests are carried out on representative single or multi-layer textiles or other materials intended for clothing for
protection against heat. They are also applicable to assemblies, which correspond to the overall build up of a heat
protective clothing assembly with or without underclothing,
Method A serves for visual assessment of any changes in the material after the action of heat radiation. With
method B the protective effect of the materials is determined. The materials may be tested either by both methods
or only by one of them.
The tests according to these two methods serve to classify materials; however, to be able to make a statement or
prediction as to the suitability of a material for protective clothing additional criteria must be taken into account.
Since the tests are carried out at room temperature the results do not necessarily correspond to the behaviour of
the materials at higher ambient temperatures and therefore are only to a limited extent suitable for predicting the
performance of the protective clothing made from the materials under test.
2 Normative reference
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at appropriate places in the text and the publications are listed below. In the case of
dated references, subsequent amendments to, or revisions of, any of these publications, apply to this European
Standard only when incorporated into it by amendment or revision. In the case of undated references the latest
edition of the publications referred to applies (including amendments).
EN 20139
Textiles - standard atmospheres for conditioning and testing (ISO 139:1973)
IEC 60584-1
Thermocouples. Part 1: Reference table
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EN ISO 6942:2002 (E)
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply,
3.1
heat transfer levels
Time t The time in seconds expressed to one decimal place, to achieve a calorimeter temperature
12
rise of (12 – 0,1) °C
Time t The time in seconds expressed to one decimal place, to achieve a calorimeter temperature
24
rise of (24 – 0,2) °C
3.2
heat transmission factor (TF)
A measure of the fraction of heat transmitted through a specimen exposed to a source of radiant heat. It is
numerically equal to the ratio of the transmitted to the incident heat flux density.
3.3
test specimen
All the layers of fabric or other material arranged in the order and orientation as used in practice and including
undergarments if appropriate.
3.4
incident heat flux density:
2
The amount of energy incident per unit time on the exposed face of the calorimeter, expressed in kW/m .
3.5
radiant heat transfer index (RHTI)
A number, to one decimal place calculated from the mean time (measured in seconds, to one decimal place) to
achieve a temperature rise of (24 ± 0,2) °C in the calorimeter when testing by this method with a specified incident
heat flux density.
3.6
change in appearance of the specimen
All changes in appearance of the material (shrinkage, formation of char, discoloration, scorching, glowing melting
etc.).
3.7
multi-layer clothing assembly
series of layers in garments arranged in the order as worn
NOTE It may contain multi-layer materials , material combinations or separate layers of clothing material in single layers.
4 Principle
4.1 Method A
A specimen is supported in a free-standing frame (specimen holder) and is exposed to a specific level of radiant
heat for a specific time. The level of radiant heat is set by adjustment of the distance between the specimen and
the thermal radiation source. Following the exposure, the specimen and its individual layers, are examined for
visible changes.
4.2 Method B
A specimen is supported in a free-standing frame (specimen holder) and is exposed to a specific level of radiant
heat. The times for temperature rises of 12 °C and 24 °C in the calorimeter are recorded and are expressed as
radiant heat transfer indexes. The percentage heat transmission factor is calculated from the temperature rise data
and is also reported.
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EN ISO 6942:2002 (E)
5 Apparatus
5.1 General
The test apparatus consists of the following items, which are used for both test methods:
- source of radiation (5.2);
- test frame (5.3);
- specimen holder (5.3).
For method B, the following are also required:
- calorimeter (5.4);
- temperature measuring and recording device (5.5).
5.2 Source of radiation
The radiation source consists of six silicon carbide (SiC) heating rods, with the following characteristics:
- total length: (356 ± 2) mm;
- length of heating part: (178 ± 2) mm;
- diameter: (7,9 ± 0,1) mm;
- electrical resistance: 3,6 W ± 10 % at 1070 °C.
These rods are placed in a U-shaped support made of insulating, flame resistant material so that they are arranged
horizontally and in the same vertical plane. Figure 1 shows the constructional details of the support and the
arrangement of the heating rods, which, are loosely mounted in the grooves of the support to avoid mechanical
stress.
Dimensions in millimetres
(tolerance for measurements ± 0,1 mm)
1 Silicon carbide rod
Figure 1: Source of radiation
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EN ISO 6942:2002 (E)
A diagram of a possible power supply for the radiation source is shown in figure 2. The six rods are arranged into
two groups of three, placed in series. The two groups are connected in parallel and are wired to the 220 V supply
through a pre-resistance of 1


 












 







voltage fluctuates by more than ± 1 % during a measurement, stabilisation has to be provided.
1 Silic
...