CS-A4 is a kind of high-powered,elastic after cured,well-sealed one-component polyurethane building sealant. It reacts with air and solidifies to form a permanent hyperelastic materials. CS-A4 is in strengthened structure, widely used in bond and sealing of construction material. Applied range: Apply to all kinds of construct precast unit,hardware and other structural joint prepared bonding and sealing.Apply to all kinds of expansion joint of buildingk,deformation joint,construction joint sealing. Suitable for various types of stone flooring,ceramics sealing and decration, the same for other building walls,access panle.