Glow-wire
IEC glow-wire ignition temperature (GWIT)
In accordance with IEC 60695-2-13, the GWIT is expressed as the temperature which is 25 K (30 K between 900 °C and 960 °C) higher than the maximum temperature of the tip of the glow-wire, which does not cause ignition of a test specimen of a given thickness during three subsequent tests.
IEC glow-wire flammability index (GWFI)
In accordance with IEC 60695-2-12, the GWFI is expressed as the highest test temperature during three subsequent tests for a test specimen of a given thickness, at which one of the following conditions is met.
- Flames or glowing of the test specimen extinguish within 30 s after removal of the glow-wire, and there is no ignition of the wrapping tissue placed underneath the test specimen.
- There is no ignition of the test specimen.
