MH PU Foam High Quality 750ml Building Fast Drying One Component Waterproof Insulation Expanding Polyurethane Pu Foam Spray 1. Core Product Advantage Polyurethane Expanding PU Foam is a versatile building material used for filling, sealing and insulating construction gaps. Its high bonding strength and expanding characteristics make it a practical choice for various building projects. The all-season formulation can be applied at temperatures down to -10°C. 2. Practical