UL746A Clause 34 Glow Wire Ignitability Tester To Determine The Relative Ignitability

UL746A Clause 34 Glow-Wire Ignitability Tester To Determine The Relative Ignitability

34 Glow-Wire Ignitability Test
34.1 General
34.1 .1 The test method for the determination of ignitability of an insulating material from an electrically heated wire is described in the Method for Glow-Wire Ignitability Test on Materials, IEC 695-2-1 /3.                         Flammability Testing Equipment
34.1 .2 The Glow-Wire Ignition Temperature (GWIT) is to be assigned as the temperature which is 25°C (45°F) higher than that temperature of the tip of the glow-wire which does not cause ignition during three consecutive tests.
34.2 Significance                  Flammability Testing Equipment
34.2.1 Either during normal operation, under unusual conditions, or as a result of malfunctions, some components of an electrical apparatus, such as wires or other conductors may become abnormally hot.
When these overheated parts are in intimate contact with the insulating material, ignition may occur. This test is intended to determine the relative ignitability of insulating materials under these conditions.                        Flammability Testing Equipment

Standard:IEC60695-2-10, IEC60695-2-13 and UL746A.

Application:This device simulates the thermal stress test of glowing component or heat source like overload resistance or ignition source which is caused in a short time. It is suitable for electric and electronic products, household appliances and other material to do fire hazard testing. It is also used in the No flame ignition source fire test to test initiation temperature and flammability index of related glowing filament.

Test sample:Electrical equipment and its components and parts, solid electrical insulating materials and other solid combustible materials.                      Flammability Testing Equipment

Feature: Test principle: the glowing filament whose material and shape is required(Ni77/Cr20) is heated to the testing temperature of 550 ℃ ～ 960 ℃ for 1 min by using the glow wire tester with large current. Then using required pressure (0.95N) vertically burns the test sample for 30s. By observing whether the test sample and bedding object ignite or the burning time, the users can judge the ignition danger of electric and electronic products. It is used for the ignition test, ignition temperature (GWIT) test, flammability test and flammability index (GWFI) test of solid insulating material and other solid combustible material.                                          Flammability Testing Equipment

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