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Classification of fire protection grades of plastics.

Update:Sep 17,2026
Summary:The fire protection grades of plastics are mainly classified according to ‌UL94 standard, and the common grades are HB, V-2, V-1, V-0, 5VB and 5VA‌ fr......

The fire protection grades of plastics are mainly classified according to ‌UL94 standard, and the common grades are HB, V-2, V-1, V-0, 5VB and 5VA‌ from low to high. This standard is formulated by the American Underwriters' Laboratory and used to evaluate the flammability of plastic parts of equipment. The higher the grade, the stronger the flame retardant performance.

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