Standard for classification of fire protection in plastic products
A sample of less than 3 mm thick, burning at less than 70 mm per minute, or extinguished before the 100 mm mark.
Plastic flame retardant grade by HB, V-2, V-1 gradually increase to V-0: 1, HB:UL94 standards in the bottom of the flame retardant grades. For a sample of 3 to 13 mm thick, combustion rate is less than 40 mm per minute;
2, V-2: the sample was subjected to two 10 second combustion tests, and the flame died within 60 seconds. A fire can fall off. 3, V-1: the sample was subjected to two 10 second combustion tests, and the flame died within 60 seconds. No fire can fall. 4, V-0: the sample was subjected to two 10 second combustion tests, and the flame died within 30 seconds. No fire can fall.
