SIST EN 16602-70-21:2015

SLOVENSKI STANDARD
SIST EN 16602-70-21:2015
01-januar-2015
1DGRPHãþD
SIST EN 14090:2004
Zagotavljanje varnih proizvodov v vesoljski tehniki - Preskušanje vnetljivosti za
izbiro vesoljskih materialov
Space product assurance - Flammability testing for the screening of space materials
Raumfahrtproduktsicherung - Brennverhaltenstest für die Auswahl von
Raumfahrtmaterialien
Assurance produit des projets spatiaux - Essai de flammabilité pour la sélection des
matériaux d'un projet spatial
Ta slovenski standard je istoveten z: EN 16602-70-21:2014
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
49.025.01 Materiali za letalsko in Materials for aerospace
vesoljsko gradnjo na splošno construction in general
49.140 Vesoljski sistemi in operacije Space systems and
operations
SIST EN 16602-70-21:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 16602-70-21:2015

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SIST EN 16602-70-21:2015


EUROPEAN STANDARD
EN 16602-70-21

NORME EUROPÉENNE

EUROPÄISCHE NORM
October 2014
ICS 13.220.40; 49.025.01; 49.140 Supersedes EN 14090:2002
English version
Space product assurance - Flammability testing for the
screening of space materials
Assurance produit des projets spatiaux - Essai de Raumfahrtproduktsicherung - Brennverhaltenstest für die
flammabilité pour la sélection des matériaux d'un projet Auswahl von Raumfahrtmaterialien
spatial
This European Standard was approved by CEN on 11 April 2014.

CEN and CENELEC 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 CEN-CENELEC Management Centre or to any CEN and CENELEC
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 and CENELEC member into its own language and notified to the CEN-CENELEC Management Centre
has the same status as the official versions.

CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia,
Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.







CEN-CENELEC Management Centre:
Avenue Marnix 17, B-1000 Brussels
© 2014 CEN/CENELEC All rights of exploitation in any form and by any means reserved Ref. No. EN 16602-70-21:2014 E
worldwide for CEN national Members and for CENELEC
Members.

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SIST EN 16602-70-21:2015
EN 16602-70-21:2014 (E)
Table of contents
Foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 7
3.1 Terms from other standards . 7
3.2 Terms specific to the present standard . 7
3.3 Abbreviated terms. 7
4 Principles . 8
4.1 Test methods . 8
4.2 Screening tests . 8
4.2.1 Overview . 8
4.2.2 Screening Test 1: Upward propagation test . 8
4.2.3 Screening Test 2: Standard test method for the determination of the
oxygen concentration limit during the combustion of polymer
materials . 9
4.2.4 Screening Test 3: Electrical wire insulation flammability test method . 9
4.3 Configuration test . 9
4.4 Additional tests . 9
5 Requirements . 10
5.1 Test procedure . 10
5.1.1 Preparatory conditions . 10
5.1.2 Test methods . 11
5.2 Quality assurance . 20
5.2.1 Data . 20
5.2.2 Nonconformance . 21
5.2.3 Calibration . 21
5.2.4 Traceability . 21
Annex A (normative) Test report – DRD. 22
Annex B (informative) Test procedures . 25
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Annex C (informative) Preparation and qualification of chemical igniters . 30
Annex D (informative) Graphical information . 38
Bibliography . 47

Figures
Figure D-1 Diagram of the equipment used to determine the oxygen concentration limit . 38
Figure D-2 Frame used to fix the sample . 39
Figure D-3 Sample holder . 40
Figure D-4 Sample holder . 41
Figure D-5 : Samples from thermoplastic polymer materials . 42
Figure D-6 : Test set up for flammability of electric wires under heated wire conditions
at 25 % by volume oxygen . 43
Figure D-7 General arrangement of modified burner and flame dimensions . 45
Figure D-8 General arrangement of apparatus for flammability test . 46

Tables
Table D-1 : Description of test equipment as per Figure D-6 . 43



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EN 16602-70-21:2014 (E)
Foreword
This document (EN 16602-70-21:2014) has been prepared by Technical
Committee CEN/CLC/TC 5 “Space”, the secretariat of which is held by DIN.
This standard (EN 16602-70-21:2014) originates from ECSS-Q-ST-70-21C.
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 April 2015,
and conflicting national standards shall be withdrawn at the latest by April
2015.
Attention is drawn to the possibility that some of the elements of this document
may be the subject of patent rights. CEN [and/or CENELEC] shall not be held
responsible for identifying any or all such patent rights.
This document supersedes EN 14090:2002.
This document has been prepared under a mandate given to CEN by the
European Commission and the European Free Trade Association.
This document has been developed to cover specifically space systems and has
therefore precedence over any EN covering the same scope but with a wider
domain of applicability (e.g. : aerospace).
According to the CEN-CENELEC Internal Regulations, the national standards
organizations of the following countries are bound to implement this European
Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
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1
Scope
This Standard defines a multi-test procedure for the determination of the
flammability characteristics of non-metallic materials under a set of closely
controlled conditions. The test procedure covers both individual materials and
materials used in configuration. This Standard describes a series of tests to
provide data for aid in the evaluation of the suitability of materials for use in a
space vehicle crew compartment. The data obtained are in respect to the ease of
ignition and the flame propagation characteristics of materials.
All non-metallic materials are inherently flammable, the degree to which this is
true is dependant on the chemical nature of the material itself and the
environment to which the material is exposed. In the closed environment of a
manned spacecraft this can lead to a potentially dangerous situation and close
control is therefore required.
This standard may be tailored for the specific characteristics and constrains of a
space project in conformance with ECSS-S-ST-00.
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2
Normative references
The following normative documents contain provisions which, through
reference in this text, constitute provisions of this ECSS Standard. For dated
references, subsequent amendments to, or revision of any of these publications
do not apply. However, parties to agreements based on this ECSS Standard are
encouraged to investigate the possibility of applying the more recent editions of
the normative documents indicated below. For undated references, the latest
edition of the publication referred to applies.

EN reference Reference in text Title
EN 16601-00-01 ECSS-S-ST-00-01 ECSS system - Glossary of terms
EN 16602-10-09 ECSS-Q-ST-10-09 Space product assurance - Nonconformance control
system
EN 16602-70 ECSS-Q-ST-70 Space product assurance - Materials, mechanical
parts and processes
DIN 50050-1:1986 Testing of materials; burning behaviour of materials;
small burning cabinet
ISO 6941:1984 Textile fabrics - Burning behaviour - Measurement of
flame spread properties of vertically oriented
specimens

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3
Terms, definitions and abbreviated terms
3.1 Terms from other standards
For the purpose of this Standard, the terms and definitions from ECSS-S-ST-00-01
apply, in particular for the following terms:
flammability
For the purpose of this Standard, the terms and definitions from ECSS-Q-ST-70
apply.
3.2 Terms specific to the present standard
3.2.1 oxygen concentration limit during the combustion of
polymeric materials
minimum volumetric amount of oxygen contained in the nitrogen-oxygen
mixture, in the presence of which the material can still combust after ignition
from the bottom
NOTE 1 It is expressed as a percentage and determined
using the equation:
n
C ,i
∑ lim
[3-1]
i =1
C =
lim
n
NOTE 2 i.e. the arithmetic average of the concentration
limit calculated as a function of the results of
unit measurements of (Clim,i).
3.3 Abbreviated terms
For the purpose of this Standard, the abbreviated terms from ECSS-S-ST-00-01
and the following apply:
Abbreviation Meaning
Clim
minimum volumetric concentration of oxygen contained
in an oxygen-nitrogen mixture, in the presence of which a
material can still combust after ignition from the bottom.
HMT hexamethylenetetramine

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4
Principles
4.1 Test methods
Four test methods are included within this Standard. They can be divided into
two different categories:
• Screening tests (see clause 4.2), and
• Configuration tests (see clause 4.3).
4.2 Screening tests
4.2.1 Overview
These are the prime tests to be performed on a material to assess its basic
acceptability or otherwise with respect to flammability. They are designed to
test the material under worst case test conditions, with respect to, for instance,
environment, use, or thickness.
The following two tests form the basis for acceptance or otherwise of most non-
metallic materials but are very different in the data generated:
a. Test 1: Upward propagation test
b. Test 2: Standard test method for the determination of the oxygen
concentration limit during the combustion of polymer materials
The choice of which test method is used is dependant on the project concerned
and is specified within the business agreement.
Test 3 “Electrical wire insulation flammability test method” is related
specifically to wire insulation materials.
Materials which meet the requirements of these tests can be considered for
general application, within the constraints of the test conditions used.
4.2.2 Screening Test 1: Upward propagation test
The purpose of this test is to determine the flammability characteristics of
candidate materials supplied to a standard format when exposed to an ignition
source applied at the bottom edge. This test in general is applicable to NASA
payloads (e.g. Space Station, STS). See also NASA STD 6001 Test 1.
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4.2.3 Screening Test 2: Standard test method for
the determination of the oxygen
concentration limit during the combustion
of polymer materials
The oxygen concentration limit provides a comparative evaluation of the
tendency of polymeric materials to burn and to assess the fire resistance of these
materials.
The oxygen concentration limit during the combustion of polymer materials is
considered as one of the main indices characterizing the risk of fire which
materials present before being considered for use in environments containing
various oxygen levels.
4.2.4 Screening Test 3: Electrical wire insulation
flammability test method
This test is designed to screen wire insulation for flammability characteristics.
4.3 Configuration test
This test is designed to determine the flammability characteristics of materials
configured in the same manner as that in qualification and subsequent
spacecraft models. It is intended to determine whether a flammability hazard
exists when a material, which fails the basic screening test, is desired to be used.
Materials which are shown to be acceptable in this manner can be accepted for
restricted application, within the constraints of the test conditions used.
Materials which fail this test are subject to a deviation request. Examples are:
a. flammable adhesives where the use is to bond two non-flammable
substrates together, or
b. flammable conformal coatings applied thinly to a non-flammable printed
circuit board.
4.4 Additional tests
These tests can be proposed related to the determination of such properties as
flash and fire point, or heat of combustion.
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5
Requirements
5.1 Test procedure
5.1.1 Preparatory conditions
5.1.1.1 Hazards, health and safety precautions
a. The supplier shall isolate hazardous substances, items and operations
from other activities.
b. The supplier shall locate items and controls so that personnel are not
exposed to hazards.
NOTE Hazards can be chemical burns, electric shock,
cutting edges, sharp points or toxic
atmospheres.
c. The supplier shall provide warning and caution notes in operations,
storage, transport, testing, assembly, maintenance and repair
instructions.
d. The supplier shall place distinctive markings on hazardous items,
equipment or facilities.
NOTE This marking is for personnel protection.
5.1.1.2 Preparation of samples
5.1.1.2.1 Cleaning
a. The supplier shall perform on the samples the same cleaning and other
treatment as those performed on the materials to be incorporated into the
spacecraft.
b. The supplier should not carry out further cleaning or treatment.
5.1.1.2.2 Handling, storage and environmental conditions
a. The supplier shall avoid contamination of the sample during handling.
NOTE This can be achieved by the use of, for instance,
suitable protective gloves.
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b. In addition, the supplier shall store and handle samples in a
cleanliness-controlled area with an ambient temperature of (22 ± 3) °C
and relative humidity of (55 ± 10) %.
NOTE 1 This can be achieved either in a conditioning
room, or by the use of desiccators filled with
silica gel or a saturated salt solution.
NOTE 2 A saturated salt solution of calcium nitrate
gives approximately 51 % humidity at the
testing temperature.
c. The supplier shall shield coated surfaces from contact by using
polyethylene or polypropylene bags or sheets.
d. The supplier shall avoid mechanical damage in the standard way by
packing the polyethylene- or polypropylene-wrapped test pieces in clean,
dust- and lint-free material.
e. The supplier shall label limited-life material with its relative shelf-life and
date of manufacture, or date of delivery if date of manufacture is not
known.
5.1.1.2.3 Identification
a. For materials submitted for testing, the supplier shall provide a
description of at least the name and nature of the material or processing.
5.1.1.3 Facilities
5.1.1.3.1 Cleanliness
a. The work area shall be clean and free of dust.
b. The supplier shall filter the air used for ventilation to prevent
contamination of the workpieces by moisture, oil or dust.
5.1.1.3.2 Special utilities
a. The supplier shall use oxygen and nitrogen supplies with minimum
purity of 99,9 %.
5.1.2 Test methods
5.1.2.1 Categories
a. The customer shall specify the choice of the screening test method within
the business agreement.
b. Materials failing to meet the requirements of the applicable screening test
shall be subject to testing in configuration.
c. Materials which fail the testing in configuration shall be subject to a
deviation request.
d. The supplier shall obtain customer approval on a case by case basis
where additional tests are identified.
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5.1.2.2 Screening Test 1: Upward propagation test
5.1.2.2.1 General
a. The supplier shall follow the test described in clause 5.1.2.5 if the
materials are unavailable in the standard format.
5.1.2.2.2 Preparation of specimen
a. The specimen shall be free of cuts, abrasions and other flaws as
determined by close visual inspection.
b. The supplier shall test films, fabrics, sheets and composites in the “as
received” condition with samples in the form of rectangles 300 mm x 64
mm minimum.
c. The supplier shall test foams and high-bulk materials in the “as applied”
thickness with samples in the form of rectangles 300 mm x 64 mm
minimum.
d. The supplier shall apply primers, coating materials, paints and
pressure-sensitive tapes on the substrate materials intended for use, if
known:
e. The coatings shall be applied in a thickness equivalent to normal use and
post-cured in accordance with prescribed manufacturing processes.
f. If the spacecraft substrate is not available, the coatings shall be applied to
300 mm x 60 mm x 0,075 mm aluminium panels.
g. The supplier shall condition the test specimens at (22 ± 3) °C and (55 ± 10) %
relative humidity for 24 hours before testing.
5.1.2.2.3 Test conditions: pressures and atmosphere
a. The test pressure and atmosphere to represent the most hazardous
atmosphere anticipated in the spacecraft shall be specified.
5.1.2.2.4 Test equipment and apparatus - chamber
a. The test chamber shall have a minimum volume of 250 l.
b. A window or viewing port for visual observation and recording shall be
included.
c. Internal lighting shall be installed.
d. Feed-throughs shall be available for gas inlets, evacuation, venting to air,
and electricity for ignition.
e. The supplier shall confirm that the outgassing rates of the organic
materials used in the construction of the chamber are acceptable.
5.1.2.2.5 Test equipment and apparatus - pressure gauge
a. Apparatus shall include a pressure gauge capable of measuring pressures
to an accuracy of 10 hPa.
5.1.2.2.6 Test equipment and apparatus – sample holder
a. Samples shall be supported in a frame which holds them taut.
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b. Samples with sufficient rigidity or samples on substrates of sufficient
rigidity and which do not retreat from a heat source by distorting or
violently shrinking may be supported using a simple clamp.
c. The sample holder should be so constructed as to have a minimum
influence on the test results.
NOTE Sample holder can influence the tests results by
conducting heat away from the sample.
5.1.2.2.7 Test equipment and apparatus – ignition source
a. Ignition of the sample shall be accomplished by employing a regulated
energy source.
b. The ignition source shall consist of a length of AWG 20 gauge Nichrome
wire which has a nominal resistivity of 2,3 Ω/m, sufficient to wind a
minimum of three turns of a solid igniter.
NOTE 1 The nominal diameter of this igniter is 3 mm
with a length of 32 mm. The flame temperature
is (1100 ± 100) °C and burns for a duration of
(25 ± 5) s.
NOTE 2 A suitable source of igniters is available from
NASA White Sands test facility. In addition a
method for the preparation of suitable igniters
is included in Annex C.

c. The igniter shall be activated by means of a regulated DC power source.
d. The igniter shall be positioned 6 mm from the lower edge of the sample.
5.1.2.2.8 Propagation rate indicator
a. The supplier shall observe and record visually the propagation rate
between markers on a scale positioned on the sample holder.
b. Timing shall be started at the first visual indication of combustion and
stopped when the flame ceases to propagate upwards.
NOTE Where appropriate it is acceptable to record the
total burn length either directly or by
subtraction; In this case, overestimation of the
burn length can occur by measuring soot
deposits higher up the sample.
5.1.2.2.9 Pre-test procedure
a. Before each series of tests, the supplier should run the pre-test procedure
as described in annex B.1.1 to calibrate the equipment.
b. If the supplier uses a different procedure, the supplier shall submit it for
customer approval.
5.1.2.2.10 Test procedure
a. The supplier should run the test procedure as described in annex B.1.2.
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b. If the supplier uses a different procedure, the supplier shall submit it for
customer approval.
5.1.2.2.11 Acceptance criteria
a. Materials shall be classified non-combustible, or self-extinguishing if the
combustion zone propagates less than 150 mm into the sample with
minimum-use thickness and the time of burning does not exceed 10
minutes.
b. There shall be no sparking, sputtering, or dripping of flaming particles
from the test sample.
c. The supplier shall test a minimum of three samples.
d. Failure of any of the three constitutes failure of the material.
5.1.2.2.12 Test results
a. The supplier shall document the test results in conformance with the
DRD in Annex A.
b. The supplier shall perform a re-test in a larger test chamber if the oxygen
concentration shows a value lower by 20 % of the original test
atmosphere.
5.1.2.3 Screening Test 2: Standard test method for the
determination of the oxygen concentration limit
during the combustion of polymer materials
5.1.2.3.1 General
a. The supplier shall use this procedure to determine the concentration limit
of oxygen (Clim) during the combustion of candidate materials.
NOTE This test is based on RKK Energia test method
ZZU.0336.028.
b. The applicability of this test shall be specified in the business agreement.
5.1.2.3.2 Description of the equipment
a. The suppler shall determine the oxygen concentration limit, during the
combustion of polymer materials.
NOTE An example of the equipment is shown in
Figure D-1 and Figure D-2.
b. The flammability testing equipment shall comprise:
1. a test column mounted vertically made of quartz glass with an
inside diameter of 75 mm and a height of 370 mm;
2. under the column a quartz tube placed with an inside diameter of
75 mm and a height of 70 mm, filled with a layer of glass balls 3
mm to 5 mm in diameter, which are used to distribute the gaseous
mixture evenly over the section of the tube;
3. a sample holder clamping the sample from the top in a vertical
position at the centre of the quartz tube;
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4. a frame used to grip fabric, foils or film samples;
NOTE An example of such a frame is given in Figure
D-2.
5. a gas burner, a tube made of copper with an inside diameter of 2,5
mm, placed along the axis of the quartz column and through the glass
balls layer; being able to maintain the flame temperature at 850 °C;
with a height of the flame of 25 mm; at a pressure of (17 ± 2) kPa;
6. a spark igniter consisting of two insulated electrodes located on
both sides of the gas burner tube;
7. an analyser module comprising a mixing chamber and an oxygen
gas analyser installed in the oxygen-nitrogen mix line, Range: (0 -
25) % and (0 - 100) %, Accuracy: ± 0,1 %, with a paramagnetic
detector;
8. a pressure reducing valve, a flowmeter and an on-off valve
installed in the fuel gas line;
9. a chronometer;
c. The supplier shall carry out the flammability tests with an exhaust
connected.
5.1.2.3.3 Samples from thermosetting polymer materials not melting
when burning
a. The materials shall be in the form of a small bar with a section of (4 ± 1)
mm x (10 ± 1) mm and a length of (200 ± 5) mm.
b. For the tests on woven and film materials, natural and artificial leather
the samples are required in their thickness and shall have the dimension
of (50 ± 1) mm wide and (200 ± 5) mm long.
c. These samples shall be used fixed in a metal frame.
NOTE For example, as depicted in Figure D-4.
d. For tests carried out on fibres which do not deform and do not melt when
burnt, samples shall be produced from these fibres in the form of braids
(200 ± 5) mm long and with a linear density equal to (5 ± 0,3) g/m (mass (1
± 0,3) g).
5.1.2.3.4 Samples from thermoplastic polymer materials which melt
when burning
a. Samples in the form of a small bar with a section of (4 ± 1) mm x (10 ± 1)
mm and a length of (200 ± 5) mm shall be surrounded with glass fibres
into a lattice work.
NOTE Such an example is given in Figure D-5.
b. To produce samples from film materials which melt a sheet one side of which
is equal to 200 mm (length of the sample) with a mass equal to (8 ± 1) g shall be
taken.
c. The sheet shall be rolled into a compact roll, and shall be surround with
glass fibre to form a bar.
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d. The mass of the glass fibres shall not exceed 1,6 g (20 % of the mass of the
sample).
5.1.2.3.5 Samples for coatings deposited on metallic surfaces
a. Tests of coatings deposited on metallic surfaces shall be carried out on
samples in configuration simulating a portion of actual equipment.
b. Tests of coatings deposited on metallic surfaces shall be supported in the
sample holder.
NOTE 1 An example of sample holder is shown in
Figure D-3.
NOTE 2 Such coatings can be undercoat, paint, enamel
and varnish.
...