How to distinguish between hard plastic pipes and flame retardant plastic pipes?
If you can use the oxygen index method in the laboratory to distinguish, in general, the rigid plastic pipe oxygen index is lower than the flame-retardant plastic
You can use this simple method to make a difference. Lighter with these two kinds of plastic, if it is flame retardant plastic will probably go out, no flame retardant will continue to go down, you can try.
Flame retardant plastic tube, you can burn it with a lighter. When the cigarette lighter is taken off, it is flame retardant plastic.
