Rigid foam plastics

Both polyurethane isocyanate and polystyrene can be foamed with suitable gassing agents to form rigid shell structures. If the foaming is unrestricted then it becomes open celled, but if restricted within shell moulds considerable pressures are created and the foam becomes compacted, with a hard outer skin which will conform to every fine detail in the mould. Self-supporting chair shells, imitation mouldings and wood carvings are made by these methods. The polyurethane foam is the more expensive of the two but will accept staples if upholstered, whereas polystyrene must have tacking strips applied. An example of the open-celled polystyrene foam is the lightweight ceiling tile.

Recent developments in lightweight sandwich boards use an open-celled ABS foam with outer layers of compacted foam.

Woodworking Tools and Installation Tips

Woodworking Tools and Installation Tips

There are a lot of things that either needs to be repaired, or put together when youre a homeowner. If youre a new homeowner, and have just gotten out of apartment style living, you might want to take this list with you to the hardware store. From remolding jobs to putting together furniture you can use these 5 power tools to get your stuff together. Dont forget too that youll need a few extra tools for other jobs around the house.

Get My Free Ebook

Post a comment