Plastic flame retardant grade by HB, V - 2, to V V - 1-0 incremental step by step:

1, HB: UL94 standard in the bottom of the flame retardant grade. Request for samples of 3 to 13 mm thick, burning speed is less than 40 mm per minute; Less than 3 mm thick samples, the burning speed is less than 70 mm per minute; Or out in front of the sign of 100 mm.

The samples - 2:2, V to 10 seconds after the combustion test twice, flame extinguished in 60 seconds. There can be so drop down.

The samples: 3, V - 1 to 10 seconds twice after combustion test, flame extinguished in 60 seconds. There can be so drop down.

The samples - 0:4, V to 10 seconds after the combustion test twice, flame extinguished within 30 seconds. There can be so drop down.