Cambridge Rubber Engineering Co., polyurethane construction sealant belongs to two component reaction curing type, there are A, B groups were formed. A group was divided into milky white or light yellow viscous polyurethane prepolymer, group B into mixing hardener and additives dehydration from the black paste or liquid, after curing has a certain flexibility and adhesion, ( A component: B component = 10: 0.8 to 1.2). Primary treatment Principle: The sticky surface must be neat processing (available portable cutting machine, wheel, just brush, etc.), so that the exposed adhesive surface layer of solid structure. Joint surface must be completely dry, clean and free of frost. The surface of all dust and cement slurry must clear brush handle clean. Rust and paint protection also need to remove the metal surface. If the structure quit, available blowtorch drying. Before coating the porous surface must first priming paint. Just brush a thin layer of primer, wait until the sticky surface before caulking sealant coating. (The company is supported by a variety of bottom paint supply). Features excellent wear resistance, low temperature flexibility, performance, adjustable range is wide, large mechanical strength, good adhesion, elasticity, excellent resilience, may be suitable for dynamic joints and deformation joints, expansion joints. Good weather resistance, oil resistance, resistance to biological aging and low prices. Scope The product is used in civil construction, transportation, precast concrete and other building materials and construction joints connecting fill seal. High roads, bridges, runways, underground pipelines, joint sealing joints and expansion joints and Deformation tunnels and buildings. Notes First, the building must be kept dry, clean and free of grease. Second, the construction should be preceded by the primer was applied to the surface, until the surface is dry on both sides of 10mm to 50mm at wide gap affix protective tape to prevent the construction of the structures excess polysulfide rubber surface dirty. Third, the tank barrel white polysulfide rubber (A component) and a bag of black hardener (component B), stir until no color so far. (Note: Due to different climate component B should be in winter, less in summer) A: B = 10: 0.8-1.2, preceded by a small test. Fourth, the mixing well polysulfide sealant filled with ash squeeze glue gun or knife in the seam compacted fill, then ≥10cm wide putty knife gum gelling. Five flat glue applied after the protective tape can be removed within 24 hours to avoid water will rain. (Dry time ≤24 hours, seven days before the irrigation experiment, 28 days to reach full performance.)