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Expandable polystyrene (EPS)

Expandable polystyrene (EPS)

Expanded polystyrene (EPS) is a rigid and tough, closed-cell foam. It is usually white and made of pre-expanded polystyrene beads. Familiar uses include molded sheets for building insulation and packing material for cushioning fragile items inside boxes. Sheets are commonly packaged as rigid panels which are also known as "bead-board". Some EPS boards have a flame spread of less than 25 and a smoke-developed index of less than 450, which means they can be used without a fire barrier (but require a 15 minute thermal barrier) according to US building codes. A growing use of EPS in construction is insulating concrete forms. The density range is about 16–640 kg/m3. The most common processing method is thermal cutting with hot wires.


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