PU9000typeNB is a two-component polyurethane sealant. The base and hardener are in a mass ratio of 25:100. After being evenly mixed by professional mixing equipment, use a two-component special glue gun to squeeze the product into the required joints to solidify to form a stable elastomer. The product has the characteristics of low modulus, high elasticity, good adhesion, no precipitation pollution, etc., and the surface can be painted after curing, and it is suitable for waterproof sealing of building joints with coatings.