Perspex or acrylic sheet (polymethyl methacry-late) is readily obtainable in clear transparent, pastel shades, full colours, and transfusing and fluorescent colours in thicknesses from V25 in (1 mm) to V2 in (12.5 mm) in colours, and up to 2 in (50 mm) in the clear sheet. It is also supplied in clear rod and tube up to 1 in (25 mm) diameter. Although not as hard as fused glass it has the same clarity and appearance and can be cut very easily with circular saw, band-saw or very fine-toothed handsaw, using low speed and light pressure and feed. It is easily drilled with the normal twist-drill lubricated with a trace of thin oil, and can be bent to simple curves at a temperature just short of boiling water (201° F; 94° C). For accurate bending a wood form should be used, the perspex sheet heated in front of an electric plate or similar source of heat, bent over the form, covered with a cloth and held in position for from one to two minutes to cool and set. Cut edges can be bonded together with simple heat, chloroform or ether, or special perspex cement, and frameless showcases are now made almost exclusively by this method, with the meeting edges either butted and polished (wet and dry paper, burnishing pastes, etc.) or mitred together, both methods giving invisible joints if well done. There is a growing tendency also to design carcass furniture in flat sheets and simple chair forms in moulded resin, for it is an excellent structural material with outstanding qualities of clarity, strength, rigidity, stability and durability under quite severe conditions of wear, as witness its use in aircraft-work. It is, however, relatively expensive, although no doubt constant research and development, as with all other plastics, will eventually cheapen costs.
28 Drawer unit with sliders in medium impact polystyrene. (By courtesy of Prestige Caterers)
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