Glow wire test

Glow wire test is to test the stability of electrical and electronic products during working. And the hot wire itself is the resistance wire ring with fixed size. When doing test, the wire ring should be heated up to the specified temperature by electricity, so that the time when the top of the wire reached the sample can meet the time standard required, then observe and measure its state. The test range depends on the specific test procedures.

When do the test for the determination of the burning of hot wire (GWFI) in a solid electrical insulation material or other solid materials test sample, there is a detailed requirement for the hot wire test method in standard GB/T 5169. Test results can be used for relative comparison of the performance of the above various materials, namely, the ability of the flame extinguished when remove the electricity heated hot wire; and the ability to not produce burning or glowing particles for the beneath bedding layers and packaging paper of the sample.

This test method is not suitable for testing the flammability of the whole equipment, because the insulation system, the structure of the combustible components and the arrangement and heat transfer of metal or nonmetal parts, the material has a great influence on the material used. In addition, this test method is not suitable for determining the performance of fire prevention and the risk of fire.

ISO/IEC 13943：2000 gives the following terms and definitions: （GWFI）Glow-wire flammability index During three times continuous tests, the highest test temperature of one test sample with the prescribed thickness satisfies one of the following conditions: 1. A) After removing of the hot wire test, the flame and glow wire extinguished in 30s, and the packaging paper placed beneath the test sample won’t burning out.

2. B) The test sample won’t burning out.. （GWIT）glow-wire ignition temperature The test sample is not caused by a test sample of a continuous three test, the highest temperature 25K (900C~960C) of the top of the burning wire is the highest temperature (30K).

Com mparing the tempera ature of the e three con nsecutive tests t won’tt be caused d by the provisions s of the thic ckness of the t test sam mple from the burnin ng of the to op of the hot wire 25K(900-9 2 60C), the temperatu t re is 30K higher. h Tes st severity levels:

Obs servation and a measurement Durring the application off the hot wire w and in the t subseq quent 30s, test person nnel sho ould observ ve the sam mple and the packagin ng paper placed in th he bottom, and make the follo owing reco ord: 1. A) The burning b tim me from the e top of ho ot wire to the t test sample or to the bed laye er under th he test sam mple.

2. B) The burning b tim me from the e top of the e hot wire to the extinguishing,, the flame may extingu uished in or after the application.

Eva aluation of test resultts If th he test sam mple is nott ignited orr satisfy on ne of the fo ollowing tw wo conditio ons, then chose a relative r low w test temp perature in Table 1, an nd repeat ttest with a new testt sample If itt meets the e above two o condition ns at the sa ame time, then t chose e a relative e low testt temperatture in Tab ble 1, and repeat r testt with a new test sam mple. The test t sho ould be con ntinued twice when th he test sam mple meets s the highe est test tem mperature in i condition n a) and b).

The e GWFI nee ed to be de etermined is the temperature meets m the m maximum test tem mperature in i condition n a) and b) during th hree consecutive trials.

When the matterial is me easured at the highes st temperatture in Tab ble 1, the GWFI testt program is not requ uired to run GWIT. The corresp ponding thickness of the matterial will be b 960C GW WFI.

GWFI: should be recorded as follows For example, the test sample of the 3mm thickness is 850C, the record is: 850/3.0 GWFI.

To meet the requirements of the above, Lisun developed ZRS-3H Glow Wire Test Apparatus, it is specially designed and produced according to the standard measurement requirements of IEC60695-2-10~IEC60695-2-13(GB/T5169.10-2006~GB/T5169.13-2006), basic testing methods of glow wire, glow wire testing apparatus, general trail program, UL746A, IEC829, GB5169, DIN695,VDE0471 or ASTM-3874-2004 and so on. Lisun Electronic (Shanghai) office is committed to the development and after-sales maintenance of lighting instrument, EMI / EMC testing system and safety testing instruments in the domestic and global market. The full range of products of Lisun are in strict accordance with the quality management and control of ISO9001:2008 requirements for R & D and production; Lisun is also the member unit of global lighting CIE association, all products are according to CIE requirements; in addition, all products of Lisun are certified by CE and get the qualification of the EU. Â