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).

Comparing the temperature of the three consecutive tests won’t be caused by the provisions of the thickness of the test sample from the burning of the top of the hot wire 25K(900-960C), the temperature is 30K higher.

Test severity levels:

Glow wire test

Observation and measurement

During the application of the hot wire and in the subsequent 30s, test personnel should observe the sample and the packaging paper placed in the bottom, and make the following record:

  1. A) The burning time from the top of hot wire to the test sample or to the bed layer under the test sample.
  2. B) The burning time from the top of the hot wire to the extinguishing, the flame may extinguished in or after the application.

Evaluation of test results

If the test sample is not ignited or satisfy one of the following two conditions, then chose a relative low test temperature in Table 1, and repeat test with a new test sample

If it meets the above two conditions at the same time, then chose a relative low test temperature in Table 1, and repeat test with a new test sample. The test should be continued twice when the test sample meets the highest test temperature in condition a) and b).

The GWFI need to be determined is the temperature meets the maximum test temperature in condition a) and b) during three consecutive trials.

When the material is measured at the highest temperature in Table 1, the GWFI test program is not required to run GWIT. The corresponding thickness of the material will be 960C GWFI.

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.