Glow-wire test adopts simulation technology to evaluate the ignition risk of heat sources such as glow-wire elements or overload resistance in the use environment, which causes thermal stress in a short time. It is used to simulate the ignition source of heat source is glow-wire heated by electricity.

Glow-wire test

Glowing-wire is a ring made of nickel/chromium wire with a diameter of 4mm. During the test, the sample is clamped with a clamp that can be moved on the track. Glow-wire electrified heating reaches the standard stipulated temperature, for example, gb2099.1-1996 stipulates that "the test shall be carried out at 650 temperature for insulating material parts that are not necessary to keep the current-carrying parts and grounding circuits in normal position, even in contact with them". Move the clamp so that glowing-wire is applied to the sample with a force of 0.8n ~ 1.2n for 30 seconds. Wrap a layer of silk paper tightly on the smooth white pine board about 10mm thick as the base layer, and place it under the glow-wire application point (200 + + 5 mm). If the sample does not ignite, or if it burns, but burns out automatically within 30 seconds of the removal of glow-wire and does not ignite the underlying layer, glow-wire test shall be deemed to have passed.

In addition, the fire resistance of materials is closely related to the addition of flame retardants. Suitable flame retardant can make the tested material can not reach the ignition point all the time in the test, or reach the ignition point and the ignition will be automatically extinguished. Can be seen in the glow wire test, some did not add flame retardant plastic material under a certain temperature or time harsh level may play a more than 30 seconds after combustion and combustion time, but after add appropriate flame retardants, under the harsh temperature or time level may become doesn't burn or although light-off in hot wire or 30 seconds automatically after you remove the needle flame extinguished, which meets the requirement of standard.

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