What is flame retardant grade
Classification:
Flame retardant fabric blog
Flame retardant grade is a grade system divided by the properties of substances or materials that can significantly delay the spread of flames after treatment. Relevant level
1.HB: The flame retardant rating of the UL94 standard midsole requires that for samples 3 to 13 mm thick, the burning speed is less than 40 mm per minute
Bell; sample less than 3 mm thick
product, the burning speed is less than 70 mm
per minute; or extinguishes before the 100mm mark.
2. V-2: After two 10-second combustion tests on the sample, the flame It goes out within 60 seconds. There may be burning objects falling.
3. V-1: After two 10-second combustion tests on the sample, the flame It goes out within 60 seconds. No burning objects can fall.
4. V-0: After two 10-second combustion tests on the sample, the flame It goes out within 30 seconds. No burning objects can fall
-Limited
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