Asphalt can be divided into coal tar asphalt, asphalt and natural asphalt three
kinds: First, coal tar pitch: coal tar pitch is a byproduct of coking, there is
no obvious boundaries, the general division method is to specify the softening
point at 26.7 ℃ (cubic method) for the following tar, 26.
Wood-plastic composite material (WPC) is a new kind of composite material which
is booming at home and abroad in recent years. It refers to the use of
polyethylene, polypropylene and polyvinyl chloride instead of ordinary resin
adhesives, and wood powder, rice husk, straw and other waste Plant f
