1. what is rigid foam polyurethane? Rigid foamed polyurethane is a new type of waterproof and thermal insulation material, which is composed of polyisocyanate (MDI, commonly known as black pigment) and mixed foaming agent, catalyst, modifier, flame retardant, anti-aging agent and other polyols (commonly known as white materials). He has a continuous and dense surface and high-strength honeycomb structure with a closed porosity of more than 95%, and is a new energy-saving material with various fu

Polyurethane directly buried insulation pipe is suitable for heat supply system with medium temperature (long-term operation temperature) not higher than 120 ℃ and occasional peak temperature not higher than 140 ℃. The working steel pipe and outer protection pipe are tightly bonded together through insulation layer to form a trinity structure.