It is made of high density polyetlene (HDPE) sheet, polymer strong reaction self-adhesive membrane and special isolation membrane protective layer. It is a kind of multi-layer composite waterproof material with superior performance specially developed for the parts of underground projects that need to be constructed by pre paving method. The material has good tensile strength and tear strength. It is a new type of waterproof material with excellent performance in underground engineering.

Under the action of pressure, the polymer self-adhesive film and the cement slurry without initial setting in the conte will ep through the anti adhesion layer to form an effective interpenetrating bond and a huge intermolecular force. After the conte is solidified, the gap between the polymer self-adhesive membrane waterproof membrane and the main structure is permanently sealed to the maximum extent, and the water channeling channel is completely eliminated.