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)

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.

Schutzkleidung - Schutz gegen Hitze und Feuer - Prüfverfahren: Beurteilung von Materialien und Materialkombinationen, die einer Hitze-Strahlungsquelle ausgesetzt sind (ISO 6942:2002)

Diese Europäische Norm legt zwei sich ergänzende Prüfverfahren (Verfahren A und Verfahren B) zur Bestimmung des Verhaltens von Materialien für Hitzeschutzkleidung bei der Einwirkung von Strahlungswärme fest.
Diese Prüfungen werden an repräsentativen ein- oder mehrlagigen Textilien oder anderen für Hitzeschutzkleidung vorgesehenen Materialien durchgeführt. Sie sind auch auf Materialkombinationen anwendbar, die dem gesamten Aufbau einer Hitzeschutzkleidung mit oder ohne Unterkleidung entsprechen.
Verfahren A dient zur visuellen Erfassung irgendwelcher Veränderungen des Materials nach der Einwirkung von Wärmestrahlung. Mit dem Verfahren B wird der Schutzeffekt des Materials bestimmt. Die Materialien können entweder nach beiden Verfahren oder nur nach einem der beiden Verfahren geprüft werden.
Die Prüfungen nach diesen beiden Verfahren dienen zur Klassifizierung von Materialien; um jedoch eine Feststellung oder Voraussage über die Eignung eines Materials für Hitzeschutzkleidung machen zu können, sind noch andere Kriterien zu berücksichtigen.
Da die Prüfungen bei Raumtemperatur durchgeführt werden, entsprechen die Ergebnisse nicht unbedingt dem Verhalten der Materialien bei höheren Umgebungstemperaturen und sind daher nur bedingt für Voraussagen über das Verhalten von Schutzkleidung geeignet, die aus den geprüften Materialien hergestellt ist.

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)

La présente Norme européenne spécifie deux méthodes complémentaires (méthode A et méthode B) pour déterminer le comportement des matériaux utilisés pour les vetements de protection soumis a un rayonnement de chaleur.
Les essais décrits sont réalisés sur des textiles représentatifs, simples ou multicouches, ou sur d'autres matériaux destinés aux vetements de protection contre la chaleur. Ils sont applicables également aux assemblages, qui correspondent a la superposition globale d'un assemblage de vetements de protection contre la chaleur, avec ou sans vetements de dessous.
La méthode A permet d'effectuer une évaluation visuelle de toutes les modifications du matériau apres les effets du rayonnement de chaleur. La méthode B permet de déterminer l'effet protecteur des matériaux. Il est possible de soumettre les matériaux a essai selon l'une des deux méthodes ou les deux.
Les essais effectués selon les deux méthodes décrites servent a classer les matériaux. Toutefois, afin de pouvoir juger si un matériau convient pour des vetements de protection, il importe de prendre en compte des criteres complémentaires.
Etant donné que les essais sont effectués a la température du local, les résultats ne refletent pas nécessairement le comportement des matériaux a des températures ambiantes supérieures et, par conséquent, ne conviennent que dans une certaine mesure pour préjuger des performances des vetements de protection fabriqués dans les matériaux soumis a essai.

Varovalna obleka - Zaščita pred toploto in ognjem - Metoda preskušanja za vrednotenje materialov in izdelkov iz teh materialov, ki so izpostavljeni viru toplotnega sevanja (ISO 6942:2002)

General Information

Status
Published
Publication Date
31-Oct-2002
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Nov-2002
Due Date
01-Nov-2002
Completion Date
01-Nov-2002

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SLOVENSKI STANDARD
SIST EN ISO 6942:2002
01-november-2002
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SIST EN 366:1996
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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.

---------------------- Page: 1 ----------------------
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.
---------------------- Page: 2 ----------------------
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

---------------------- Page: 3 ----------------------
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.
---------------------- Page: 4 ----------------------
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
---------------------- Page: 5 ----------------------
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

rise of (12 – 0,1) °C

Time t The time in seconds expressed to one decimal place, to achieve a calorimeter temperature

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:

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.
---------------------- Page: 6 ----------------------
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
---------------------- Page: 7 ----------------------
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
...

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