Foam is a polymer material consisting of cells that provide cushioning and absorb sound. Foam cubes and balls are made of flexible, resilient polyether that compresses under pressure and regains its shape when pressure is released. They're often used for packaging and sound dampening applications. Foam sheets, strips, and rolls include polyethylene products for shock absorption, flotation, and packaging applications as well as polyurethane products for use as building insulation and flooring underlay.
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