HYPERSEAL®-EXPERT-150 is an innovative polyurethane mastic for sealing expansion-contraction joints. It is designed to provide sealing mastic with virtually zero tendency to swell under very difficult weather conditions. The material has excellent thixotropy and can be applied to very large vertical joints. It polymerizes through reaction with atmospheric moisture and produces a low modulus of elasticity (50% joint movement accommodation factor) with excellent adhesion to substrates traditionally difficult for polyurethane, such as glass, aluminium, polycarbonate, etc. Extrusion and application of mastic (with a propellant gun) remain as easy regardless of climatic conditions, so mastic is easy to use even during the winter months at very low temperatures.
