Knowra Polyurethane foam Polyurethane foam Polyurethane foam is a cellular polymer formed when compounds react to create urethane linkages. Its gas-filled cells give it lightweight, insulating, cushioning, or buoyant properties.
Polyurethane : A family of polymers containing urethane linkages in their molecular structure. The foam is a cellular form of this broader polymer family.
Open-cell foam : Foam whose cells connect through openings, allowing air to pass through its structure. Many flexible polyurethane foams have interconnected cells that permit airflow and compression.
Flexible polyurethane foam : A resilient, compressible polyurethane foam used chiefly for cushioning and comfort. It provides padding in furniture, mattresses, vehicle interiors, and other products.
Polyethylene foam : A lightweight foam made from polyethylene, often used for packaging and protective padding. It offers a non-polyurethane option for cushioning and packaging with different chemical properties.
Polyol : A compound with multiple hydroxyl groups that can react to form polymers. Polyols supply hydroxyl groups that react with isocyanates during foam formation.
Closed-cell foam : Foam whose cells are largely sealed from one another and contain trapped gas. Rigid polyurethane insulation commonly uses closed cells to limit heat and moisture transfer.
Rigid polyurethane foam : A stiff, low-conductivity polyurethane foam used for insulation and structural applications. Its closed-cell structure makes it useful in buildings and refrigerated equipment.
Polystyrene foam : A cellular material made from polystyrene, including expanded and extruded forms. It competes with rigid polyurethane foam in insulation and packaging.
Isocyanate : A reactive chemical group, –N=C=O, used to make polyurethanes and other compounds. Isocyanate groups react with polyols to build the foam’s polymer network.
Foam density : The mass of a foam material per unit volume. Density helps characterize polyurethane foam and influences weight, cost, and mechanical performance.
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