What is the concept of FV-0 raw UL certified material ?
What is the concept of FV-0 raw UL certified material ?
The flame retardant grade increased gradually from Hb, V-2, V-1 to V-0: Du
1. HB: the lowest flame retardant grade in UL94 standard. It is required that the combustion rate of the sample with the thickness of 3 to 13 mm within Dao should be less than 40 mm / min; for the sample with thickness less than 3 mm, the burning speed should be less than 70 mm / […]