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Plastic and flame retardant grade HB, v-2, how are V-1 and V-0 defined?
From;    Author:Stand originally
Plastic and flame retardant grade by HB, v-2, v-1 chases class to increase by degrees to V-0:
HB: In UL94 and standard of CSA C22.2 No 0.17 most of the bottom flame retardant grade. Requirement to 3 to the sample with 13 large millimeter, combustion speed is less than 40 millimeter minutely; Be less than the sample with 3 large millimeter, combustion speed is less than 70 millimeter minutely; Perhaps go out before the mark of 100 millimeter.
V-2: After the combustion that has 10 seconds twice to sample checks, blaze goes out inside 60 seconds. Can combustion content drops.
V-1: After the combustion that has 10 seconds twice to sample checks, blaze goes out inside 60 seconds. Cannot combustion content drops.
V-0: After the combustion that has 10 seconds twice to sample checks, blaze goes out inside 30 seconds. Cannot combustion content drops. Information source:

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