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Construction and Building Material Conventional PU Foam Insulation Polyol Mixture for Door Panel. Fire Retardant Performance: Class B2 fire rating with flame spread of 40-45mm and self-extinguishing time of 50 seconds. Customization Options: Offers full customization, minor customization, and flexible customization from samples or designs. Strong Mechanical Properties: Provides high compressive strength (0.12-0.20MPa) and tensile strength for durable panel construction. Versatile Application: Ideal for door panels, sandwich panels, roofing, and air conditioning ducts using dispensing or pouring. Eco-Friendly Formula: Contains CFC-free blowing agents and offers excellent barrier properties against air, water, and noise.