EN ISO 9773:1998
(Main)Plastics - Determination of burning behaviour of thin flexible vertical specimens in contact with a small-flame ignition source (ISO 9773:1998)
Plastics - Determination of burning behaviour of thin flexible vertical specimens in contact with a small-flame ignition source (ISO 9773:1998)
Kunststoffe - Bestimmung des Brandverhaltens von dünnen, biegsamen, vertikal ausgerichteten Probekörpern in Kontakt mit einer kleinen Zündquelle (ISO 9773:1998)
Die vorliegende Internationale Norm legt ein im Laboratorium ohne großen Aufwand durchführbares Klassierungsverfahren für den Vergleich des relativen Brandverhaltens von vertikal ausgerichteten, dünnen und relativ flexiblen Probekörpern aus Kunststoff fest, die mit einer kleinen Zündquelle beflammt werden. Diese Probekörper können nicht nach Verfahren B von ISO 1210 geprüft werden, da sie sich während der Beflammung verdrehen oder schrumpfen, ohne sich zu entzünden.
Plastiques - Détermination du comportement au feu d'éprouvettes minces verticales souples au contact d'une petite flamme comme source d'allumage (ISO 9773:1998)
Polimerni materiali - Določanje obnašanja pri gorenju pokončno postavljenih, tankih upogljivih preskušancev pri stiku z majhnim plamenom (ISO 9773:1998)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2000
3ROLPHUQLPDWHULDOL'RORþDQMHREQDãDQMDSULJRUHQMXSRNRQþQRSRVWDYOMHQLK
WDQNLKXSRJOMLYLKSUHVNXãDQFHYSULVWLNX]PDMKQLPSODPHQRP ,62
Plastics - Determination of burning behaviour of thin flexible vertical specimens in contact
with a small-flame ignition source (ISO 9773:1998)
Kunststoffe - Bestimmung des Brandverhaltens von dünnen, biegsamen, vertikal
ausgerichteten Probekörpern in Kontakt mit einer kleinen Zündquelle (ISO 9773:1998)
Plastiques - Détermination du comportement au feu d'éprouvettes minces verticales
souples au contact d'une petite flamme comme source d'allumage (ISO 9773:1998)
Ta slovenski standard je istoveten z: EN ISO 9773:1998
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 9773
Second edition
1998-03-01
Plastics — Determination of burning
behaviour of thin flexible vertical
specimens in contact with a small-flame
ignition source
Plastiques — Détermination du comportement au feu d'éprouvettes minces
verticales souples au contact d'une petite flamme comme source
d'allumage
A
Reference number
ISO 9773:1998(E)
ISO 9773:1998(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national standards bodies (ISO member bodies). The work of
preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which
a technical committee has been established has the right to be represented
on that committee. International organizations, governmental and non-
governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 9773 was prepared by Technical Committee
ISO/TC 61, Plastics, Subcommittee SC 4, Burning behaviour.
This second edition cancels and replaces the first edition (ISO 9773:1990)
which has been technically revised.
Annex A of this International Standard is for information only.
© ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet central@iso.ch
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii
©
INTERNATIONAL STANDARD ISO ISO 9773:1998(E)
Plastics – Determination of burning behaviour of thin flexible
vertical specimens in contact with a small-flame ignition source
1. Scope
1.1 This International Standard specifies a small- scale laboratory screening procedure for comparing
the relative burning behaviour of vertically oriented thin and relatively flexible plastics specimens
exposed to a low-energy-level flame ignition source. These specimens cannot be tested using method B of
ISO 1210 since they distort or shrink away from the applied flame source without igniting.
1.2 This method of test determines the afterflame and afterglow times of specimens.
1.3
The classification system described in annex A is intended for quality control and the preselection
of component materials for products. The classification established by this method of test is applicable
only to the material used for the specimens.
NOTE 1 - Test results are influenced by material components, e.g. pigments, fillers, fire-retardant concentrations.
2. Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of
this International Standard. At the time of publication, the editions indicated were valid. All standards are
subject to revision, and parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the standards indicated below. Members
of IEC and 1SO maintain registers of currently valid International Standards.
ISO 291:1997, Plastics — Standard atmospheres for conditioning and testing.
ISO 1043-1:l997, Plastics — Symbols and abbreviated terms — Basic polymers and their special
characteristics.
1)
ISO 1210:— , Plastics — Determination of the burning behaviour of horizontal and vertical specimens
in contact with a small-flame (50 W) ignition source.
ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results — Part 2:
Basic method for the determination of repeatability and reproducibility of a standard measurement
method.
2)
ISO 10093:— , Plastics — Fire tests — Standard ignition sources.
ASTM D 5207-91, Standard practice for the calibration of 20 mm and 125 mm test flames for small-scale
burning tests on plastic materials."
———————
1) To be published. (Revision of ISO 1210:1992)
2) To be published. (Revision of ISO 10093:1994)
©
ISO
ISO 9773:1998(E)
3. Definitions
For the purposes of this International Standard, the following definitions apply:
3.1 afterflame: A flame which, under specified test conditions, persists after the ignition source has
been removed.
3.2 afterflame time: The length of time for which an afterflame persists.
3.3 afterglow: Persistence of glowing of a material, under specified test conditions, after cessation of
flaming or, if no flaming occurs, after the ignition source has been removed.
3.4 afterglow time: The length of time for which an afterglow persists.
4. Principle
A test specimen having a nearly cylindrical form is supported vertically by one end and the free end is
exposed to two successive applications of a specified gas flame. The burning behaviour of the specimen is
assessed by measuring the afterflame and/or afterglow time,
5. Significance of test
5.1 Tests made on a material under the conditions specified in this standard can be of considerable
value when comparing the relative burning behaviour of different materials, controlling manufacturing
processes or assessing any change in burning characteristics prior to, or during, use. The results obtained
from this method are dependent upon the shape, orientation and insulation of the specimen and the
conditions of ignition. Correlation with performance under actual service conditions is not implied.
5.2 Results obtained in accordance with this standard shall not be used to describe or appraise the fire
hazard presented by a particular material or shape under actual fire conditions. Assessment for fire hazard
requires consideration of such factors as: fuel contribution, intensity of burning (rate of heat release),
products of combustion and environmental factors such as the intensity of source, orientation of exposed
material and ventilation conditions.
5.3 Burning behaviour as measured by this test method is affected by such factors as density, colour
and anisotropy of the material and thickness of the specimen.
5.4 The effects on the burning behaviour of additives, deterioration, and possible loss of volatile
components are measurable using this method. Results obtained using this method may serve for
comparing the relative performance of materials and can be helpful in material assessment.
5.5 The burning behaviour of some plastic materials may change with time. It is accordingly advisable
to make tests before and after oven conditioning by an appropriate procedure that is described in the test
report. The preferred oven conditioning conditions shall be 7 days at 70°C. However, other oven
conditioning times and temperatures may be used if agreed to by all parties.
©
ISO
ISO 9773:1998(E)
6. Apparatus and materials
6.1 Laboratory fume hood (cupboard), having an internal volume of at least 0,5 m , which shall be
used when testing the specimens. The chamber shall permit observation and shall be draught free while
permitting normal thermal circulation of air past the specimen during burning. For safety and
convenience, it is desirable that this enclosure (which can be completely closed) be fitted with an
evacuation device, such as an exhaust fan, to remove products of combustion which may be toxic.
However, it is important to turn off the device during the actual test and to start it again immediately after
the test to remove the products of combustion.
6.2 Laboratory burner, as described in ISO 10093 as ignition source P/PF2
(50 W source), having a barrel length of 100 mm ± 10 mm and an inside diameter of
9,5 mm ± 0,3 mm. The barrel shall not be equipped with an end attachment such as a stabilizer. The
burner shall be calibrated in accordance with ASTM D 5207.
6.3 Ring stand, with clamps or the equivalent, adjustable for positioning of the specimen.
6.4 Timing device, accurate to 0,5 s in one hour with a resolution of 0,1 s.
6.5 Measuring scale, graduated in millimetres.
6.6 Supply of technical-grade methane gas, of minimum purity 98 %, with regulator and meter for
uniform gas flow.
3 3
NOTE 2 - Other gas mixtures having a heat content of 37 MJ/m ± 1 MJ/m have been found to provide similar results.
However, technical-grade methane, having a minimum purity of 98 percent, shall be used in cases of dispute.
6.7 Desiccator, containing a suitable drying agent, capable of maintaining a relative humidity not
exceeding 20 % at 23°C ± 2°C.
6.8 Conditioning room or chamber, capable of being maintained at 23°C ± 2°C and a relative
humidity of (50 ± 5) % as specified in ISO 291.
6.9 Micrometer, capable of being read to 0,01 mm,
6.10 Specimen mandrel form, made from 13 mm ± 0,5 mm diameter rod.
6.11 Pressure-sensitive adhesive tape, of a commercially available type.
6.12 Stainless steel or nichrome wire, of diameter 0,2 mm to 0,5 mm.
6.13 Absorbent 100 % cotton wool.
6.14 Air-circulating oven, capable of being maintained at 70°C ± 2°C with a minimum of five air
changes/hour.
6.15 Weighing scale or balance, having an accuracy and resolution of 0,01 g.
©
ISO
ISO 9773:1998(E)
7. Specimens
7.1 All specimens shall be cut from a representative sample of the material (sheets or end-products).
After any cutting operation, care shall be taken to remove all dust and any particles from the surface; cut
edges shall have a smooth finish.
7.2 Standard specimens shall be 200 mm ± 5 mm long, 50 mm ± 2 mm wide and a maximum of 0,1
mm thick. Measure the thickness of each to the nearest 0,01 mm
and note the measurements.
NOTE 3 - Tests made on specimens of different thicknesses or density may not be comparable and tests made in different
directions of anisotropy or on different colours may also not be comparable.
7.3 Specimens shall be prepared by marking a line across the specimen width 125 mm ± 5 mm from
one end (bottom) of the cut specimen. The longitudinal axis of the specimen shall be wrapped tightly
around the longitudinal axis of the mandrel to form a lapped cylinder with the 125 mm line exposed. The
overlapping portions of the specimens shall be secured within the upper 75 mm segment above the 125
mm mark and at the upper end of the tube with pressure-sensitive adhesive tape. The mandrel shall then
be removed.
NOTE 4 - For stiff specimens, the pressure-sensitive tape may be reinforced or replaced by nichrome wire wound around the
top 75 mm of the specimen (see figure 1).
7.4 A minimum of 20 specimens shall be prepared. It is advisable to prepare additional specimens for
retest purposes if necessary.
8. Conditioning
Unless otherwise required by the material specifications, conditioning and testing shall be carried out
under the following conditions:
8.1 Two sets of five specimens shall be preconditioned for at least 48 h at 23°C ± 2°C and (50 ± 5) %
relative humidity. Testing shall be carried out in the laboratory atmosphere (see 9.1) within one hour of
being conditioned.
8.2 Two sets of five specimens shall be preconditioned for 168 h at 70°C ± 1°C
and then cooled in a desiccator for at least 4 h at room temperature, prior to testing. Once removed from
the desiccator, the specimens shall be tested in the laboratory atmosphere (see 9.1) within one hour.
9. Test procedures
9.1 All specimens shall be tested in a laboratory atmosphere of 15°C to 35°C and
45 % to 75 % relative humidity.
9.2 Clamp the specimen from the upper 6 mm of its length with the longitudinal axis vertical by a
heavy spring clamp or other device, so that the upper end of the tube is closed to prevent any chimney
effects during the test. The lower end of the specimen shall be 300 mm ± 10 mm above a horizontal layer
of 0,05 g to 0,08 g of cotton wool of area approximately 50 mm x 50 mm and maximum thickness 6 mm
(see figure 2).
©
ISO
ISO 9773:1998(E)
9.3 Obtain the desired burner flame by adjusting the supply and air ports of the burner until a yellow-
tipped blue flame of height 20 mm ± 1 mm is produced. Increase the air supply until the yellow tip just
disappears. Measure the height of the flame again and correct it to 20 mm ± 1 mm if necessary.
9.4 Apply the flame of the burner centrally to the middle point of the bottom edge of the unlapped
section (see note 5) of the specimen so that the top of the burner is 10 mm ± 1 mm below that point of the
lower end of the specimen, and maintain it at that distance for 3 s ± 0,5 s, moving the burner as necessary
in response to any changes in the length or position of the specimen (see note 6). If the specimen drips
o
molten or flaming material during the flame application, t
...
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