IEC 60695-2-13:2010 pdf – Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods – Glow-wire ignition temperature (GwIT) test method for materials.
In addition, test specimens with intermediate density, melt flows, and fillerreinforcement content shall be tested to determine the representative range for each GWIT determination. However, as an alternative. the least favourable performance of the specific levels of density, melt flows and fillerlreinforcement tested may be considered representative of intermediate levels without additional testing.
4.3.3 Colour
When evaluating a range of colours, test specimens that
a) contain no colouring,
b) contain the highest level of organic pigments/colorants/dyes andfor carbon black,
C) contain the highest level of inorganic pigments, and
d) contain plgmentsicolorants/dyes which are known to adversely affect flammability characteristics
are considered representative of the colour range it the test results yield the same GWIT.
5 Apparatus
The description of the test apparatus is specified in Clause 5 of IEC 60695-2-10. The reference to a specified layer does not app’y.
6 Temperature measuring system verification
The method of verification of the temperature measuring system is specified In 6.2 of
IEC 60695-2-10.
7 Conditioning and test conditions
7.1 Conditioning of test specimens
The test specimens shall be conditioned for a minimum of 48 h at 23 C ± 2 °C and at a relative humidity between 40 % and 60 %. Once removed from the conditioning atmosphere. the test specimens shall be tested within 4 h (see ISO 291, Clause 6, Table 2, Class 2).
7.2 Testing conditions
The test specimens shall be tested in a laboratory atmosphere having a temperature of 25 °C ±
10 C and at a relative humidity between 45 % and 75 %.
8 Test procedure
8.1 General
The test specimens shall be identified and examined visually.
The general test procedure shall be as specified in Clause 8 of IEC 60695-2-10.
8.2 InItial test temperatures
The glow-wire is heated to one of the initial test temperatures specified in Table 1, which is considered to be just high enough to cause ignition. If unknown, the initial test temperature shall not exceed 650 C.
a) a description of the tested material, including thickness. colour, type and manufacturer,
b) a description of the method for the preparation of the test specimens. if available.
c) the direction of any anisotropy. if known, relative to the dimensions of the test specimen. and
d) the pre-lest conditioning of the test specimens.
9.3 Test observations
During the time of application of the glow-wire, and during a further period of 5 s. the test specimen shall be observed and the following shall be recorded:
a) the time, t . of the longest sustained and Continuous flaming andior glowing combustion observed (10 the nearest 0,5 s);
b) the test temperatures from Clause 8,
C) whether or not the glow-wire penetrated through the test specimen;
d) total consumption of the test specimen, if this occurs; and
e) additional observations that may be agreed to by both parties.
10 Evaluation of test results
10.1 Test criteria
The test specimen is considered to have withstood this test
a) if there is no ignition, or
b) if sustained and continuous flamang combustion does not occur for a time longer than 5 s for any single flame event and the specimen is not totally consumed.
NOTE It the measured value 5 5.2 s, thIs should be recorded as 5.0 a. It the measured value is 5.3 a, Ihis should be recotded as 5.5 a.
10.2 Glow-wire ignition temperature
The GWIT is the temperature which is 25 K (30 K for 900 °C and 930 °C) higher than the maximum test temperature at which three test specimens at the relevant thickness withstand the test criteria as defined in 10.1.
The GWIT shall be reported in the following manner:
for example, for a test specimen of 3.0 mm thickness and a maximum test temperature which does not cause ignition at 825 C.