The Fireproof Levels of Plastic Materials—UL94

Plastic Flame Retardant Levels:HB / V-2 / V-1 / V-0 / 5VB / 5VA

HB:The lowest level of flame retardant in UL94

It is required that burning speed of a sample smaller than 3mm thick smaller 70mm/min;

while burning speed of a sample 3-13mm thick smaller than 40 mm/min, or extinguishes before the sign of 100mm. 或者在100毫米的標誌前熄滅。

V-2:Having two 10-seconds burning tests on samples, residual flame and afterburning extinguished within 60 seconds, and the dropped fine particle could ignite cotton.

V-1:After two 10-second burning tests on samples, residual flame and after burning extinguished within 60 seconds, while the dropped fine particle could not ignite cotton.

V-0:After two 10-second burning tests on samples, residual flame and afterburning extinguished within 30 seconds, and the dropped fine particle could not ignite cotton.

5VB:After five times of 5-second burning tests on samples, residual flame and after burning extinguished within 60 seconds, and the dropped fine particle aould not ignite cotton.

5VA:After 5 times of five-second burning tests on samples, residual flame and afterburning extinguished within 30 seconds, and the dropped fine particle could not ignite cotton.

 

Thickness Test:

3.17mm(1/ 8in)

1.58mm(1/16in)

0.80mm(1/32in)

0.40mm(1/64in)

Flammability levels of UL94 is the most comprehensive creteria applied to flammability of plastics as it is used to evaluate the extinguish capability of materials after ignited. According to burning speed, burning time, anti-drop ability, and whether the dropped globule is flammable (several methods applicable). From each and every material tested we may acquire lots of information or values from colors or thickness. When we decide a material for a certain product, the UL levels may meet the thickness requirement of plastic part walls. Thus, UL levels and thickness should be reported together, as neither is dispensable.



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