The best method for testing electro technical products with regard to fire hazard is to duplicate exactly the conditions occurring in practice. In most instances, this is not possible. Accordingly, for practical reasons, the testing of l products with regard to fire hazard is best conducted by simulating as closely as possible the actual effects occurring in practice.
Test setup
1、Glow-wire flammability index (GWFI) test method
a) This test is used to determine the glow wire flammability index.
b) Pre-treatment::48 h/23 °C/50 % rel. humidity
c) -The temperature of the tip of the glow-wire is 550°C,600C 650°C,700°C, 750°C, 800°C ,850°C 900°C and 950°C.
d) Test criterion for three consecutive test pieces of the same thickness:
①、 Highest temperature at which the flames or glowing are extinguished within 30s of
removing the glow wire.
②、In addition, the tissue paper underlay beneath the test specimen must not ignite.
③、The test specimen does not ignite.
2、Glow-wire ignition temperature (GWIT) test method
a) This test is used to determine the glow wire ignitability temperature.
b) Pre-treatment:48 h/23 °C/50 % rel. humidity.
c) The temperature of the tip of the glow-wire is 550°C,600C 650°C,700°C, 750°C, 800°C ,850°C 900°C and 950°C.
d) Test criterion for three consecutive test specimen of the same thickness:
e) The highest temperature at the end of the glow wire at which there is no ignition during the contact time (ignition that lasts for longer than 5s).
f) The glow wire ignition temperature is the temperature that is 25 °C higher than the highest temperature measured at the end of the glow wire.
