| http://www.w3.org/ns/prov#value | - The following description will be principally concerned with polyester films; the latter are produced from polyesters which are known per se, having, after the usual extrusion, drawing and heat-setting processes, satisfactory mechanical properties which enable them to perform the function of a base film (high modulus, dimensional stability etc); the polyesters may be any straight-chain or essentia
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