it is a two-component water proof material which is singly packed and solidifies under ambient tempreture.it is based on liquid polusulfide rubber, with addictive of various chemical assistants and polymer material, processed with special synthesis procedures.it is a perfect poison-free water-proof sealing material, with good aging resistance and water resistance, great adhesion and elasticity.it could maintain good physical , chemical performance under condition of continous stretching, vibration and temperature change.it also has good adhesion to many metal and non-metal materials.