Polystyrene beads

Expanded polystyrene beads are used as loose fill for cavity insulation. To prevent subsequent slippage and escape through voids, one system bonds the polystyrene beads by spraying them with atomised PVA

adhesive during the injection process, although other processes leave the material loose. Walls up to 12 m in height can be insulated by this type of system. Polystyrene bead insulation should not be used where electrical wiring is present in the cavity, as the polystyrene gradually leaches the plasticiser out from plastic cables causing their embrittlement which could lead to problems later if the cables are subsequently moved. Polystyrene bead aggregate cement is used to form an insulating sandwich core in concrete cladding panel systems.

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