Flame retardancy test is a test method for the ability of the measured object to delay flame extension, spread and diffusion.After many years of development, flame retardancy test has formed a variety of standards, become the relevant industry very important test items.

Now many plastic products need to be flame retardant test, the flame retardant standard can be A good judge of which grade the product belongs to, so that users will not use the product in the wrong place so as to prevent the occurrence of danger. There are many flame retardant standards, among which the American flame retardant standard is ANSI/UL94, UL1581, and the national standard GB4943.1-2011 appendix A also introduces the combustion test.

There are five standard flame retardant tests for UL94:

1. Grade B horizontal combustion test requires a combustion rate of less than 40 mm/min for samples 3 to 13 mm thick;Samples less than 3 mm thick, burning less than 70 mm per minute;Or go out before the 100 mm sign.

2-0, 94 V, 94 V V - 1/94-2 levels of vertical burning test, including 2 V - two samples for 10 seconds after combustion test, the flame extinguished in 60 seconds, can have the air drop down, V - 1 for the samples twice after 10 seconds of combustion test, the flame extinguished in 60 seconds, there cannot be so, V - 0 for the samples twice after 10 seconds of combustion test, the flame extinguished within 30 seconds, there cannot be so drop down

3. 94, 5-V grade vertical combustion test

4. Flame spread index test with radiant plate

5. Vertical combustion test of 94VTM-0, 94VTM-1 and 94VTM-2

UL1581 Flame retardant standard wire combustion mode:

1, VW-1: Vertical combustion test (UL wire combustion grade)

2. FT1: Vertical combustion test;

3. FT2: Horizontal combustion test;

4. FT4: Vertical combustion test;

5. FT6: Horizontal combustion and smoke test.(The combustion grade of FT class is CSA standard wire combustion grade)

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