Abstract
IN the electrical industry cellulose acetate is widely used in both sheet form and as mouldings. A multilayer insulating material, made from cellulose acetate, and known as ‘Isoflex’, is described in the Electrician of March 7. Isoflex is manufactured from cellulose acetate film and in structure is not unlike corrugated cardboard used for packing purposes, with about five layers to each inch of thickness. It has a thermal conductivity of 0-32 B.TH.TJ. per hour per sq. ft. per in. thickness per 1° F. difference of temperature, so that its insulation properties compare very favourably with slab-cork (0-25 B.TH.U.), glass-fibre (0-28 B.TH.U.) and wood fibre board (0-38 B.TH.U.). Its volume weight of 0-75 lb. per cu. ft. works out at about one-tenth that of slab-cork. This makes it of considerable interest in connexion with thermal insulation during transport.
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