Lai Shun Modified Asphalt Waterproof Sheet 2.5mm x 3mm x 4mm

It is a sheet-type waterproof material that is made by modifying traditional petroleum asphalt with high molecular polymers, and using a base fabric (such as polyester felt or glass fiber felt) as the reinforcing layer. The two sides are covered with isolation materials. 
The meaning of "modification": Ordinary asphalt has the drawback of "softening at high temperatures and cracking at low temperatures", meaning it is prone to softening and flowing at high temperatures, and cracking at low temperatures. By adding high molecular polymers, its resistance to high and low temperatures, durability, and elasticity have been greatly improved, making it a superior waterproof material.