... , Width: 500-1900mm 2,Area density:20-600gsm 3,Flame retardant Fire-proof paperDescription:Our company is one of a few ... ≤ 6( GB/T2406)3, Duration of flame (s) ≤ 1 (GB/T2406)4, Time of continuous burning (s) ≤ 2 (GB/T2406)5, Length of ... paper-boards.4, In addition, we could manufacture using the materials customer offers.Flame-retardant testing: Light the paper, and there is no ...