PN-EN 60695-2
Laboratory
TEST FLAMMABILITY OF IGNITABILITY
OF MATERIALS WITH GLOW - WIRE TEST METHODS ACCORDING TO PN-EN
60695-2-10, PN-EN 60695-2-11, PN-EN 60695-2-12, PN-EN 60695-2-13.
Principle
of the test.
The
principle of the method is to subject the material/product to the
effect of a wire glowing at specified temperatures to determine the
maximum temperature at which no flame burning occurs.
Stand for testing the assessment of
ignitability of materials with glow - wire test methods
The material/product has undergone a positive test glowing the wire (criterium of the material/product) if there is no flame burning or glowing or when all of the following situations apply when ignition occurred:
- If flames or glowing combustion of the test specimen extinguish within 30 s after removal of the glow wire, i.e. te ≤ ta + 30 s;
- The specified layer placed underneath the test specimen does not ignite.
On this basis, it is determined:
the glow - wire - flammability index (GWFI) of the material - the highest temperature glowing wire (PN-EN 60695-2-11), at which during the three successive tests performed on a test sample of a specified thickness is fulfilled one of the following conditions:
- no ignition of the test sample shall occur,
- if flames or glowing combustion of the test specimen extinguish within 30 s after removal of the glow wire, i.e. te ≤ ta + 30 s;
- the specified layer placed underneath the test specimen does not ignite,
the glow - wire – end product temperature (GWEPT) - the highest temperature glowing wire (PN-EN 60695-2-11), at which during the three successive tests performed on a test of product sample is fulfilled one of the following conditions:
- no ignition of the test sample shall occur,
- if flames or glowing combustion of the test specimen extinguish within 30 s after removal of the glow wire, i.e. te ≤ ta + 30 s;
- the specified layer placed underneath the test specimen does not ignite,
glow-wire ignitability temperature (GWIT) – 25 K higher temperature than the highest glowing temperature of the wire (PN-EN 60695-2-13), which does not cause an inflammation of the test sample of a specified thickness during three successive test.
Test specimen.
The specimens shall be as representative as possible of the material or product. If possible, it is recommended to test the complete product. A section of the product containing the basic part thereof may be cut out. In general, 10 samples are sufficient to assess the flammability method of wire glowing.
Dimensions Samples.:
- Length ≥ 60 mm
- Width ≥ 60 mm,
Actual thickness of the product
Applying research methods:
- civil engineering (electric products)
- railways (requirements R25 according to PN-EN 45545-2).