The flame retardant grades of plastics increase from HB, V-2, V-1, V-0, 5VB to 5VA:
HB: The lowest flame retardant level in the UL94 standard. It is required that for samples 3 to 13 mm thick, the burning rate is less than 40 mm per minute; for samples less than 3 mm thick, the burning rate is less than 70 mm per minute; or it is extinguished before the 100 mm mark.
V-2: After two 10-second burning tests on the sample, afterflame & afterburning are extinguished within 60 seconds. The dripping particles can ignite cotton.
V-1: After two 10-second burning tests on the sample, afterflame & afterburning are extinguished within 60 seconds. The dripping particles must not ignite cotton.
V-0: After performing two 10-second combustion tests on the sample, the after-flame & after-fire are extinguished within 30 seconds. The dripping particles must not ignite cotton.
5VB: After five five-second burning tests on the sample, the afterflame & afterburning went out within 60 seconds. The dripping particles must not ignite cotton. It is allowed to burn through for bulk samples.
5VA: After five five-second burning tests on the sample, afterflame & afterburning are extinguished within 30 seconds. The dripping particles must not ignite cotton. Block samples are not allowed to burn through.
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