Summary:Different grades are mainly distinguished by burning time, dripping and burning through:
Extinguishing time: V-0 requires that the fire source be ex......
Different grades are mainly distinguished by burning time, dripping and burning through:
Extinguishing time: V-0 requires that the fire source be extinguished quickly within 10 seconds after being removed, and V-1 and V-2 are allowed to be extinguished within 30 seconds. Drops: V-0 and V-1 are not allowed to ignite the cotton below, and V-2 is allowed. Burn-through resistance: Grade ：5VA samples cannot be burned through, and Grade 5VB allows pinholes.
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