The laminate PDR 100—characteristics and technology

The production process of the PDR 100 epoxy glass based laminate, as developed by Philips, Holland, produced laboratory results which, with appropriate modifications, were applied by MAS SpA to achieve successful production of a laminate with proven consistency of quality. Industrial tests were carried out on material of varying thickness. The preparation of the resin mix, which differed in composition from that used by the Philips pilot plant, is described in detail, followed by the impregnation process, with emphasis on the precautionary measures necessary. The processes of pressing and finishing of the laminates are discussed, the emphasis again being on the prevention of contamination. The presence of titanium dioxide in the epoxy resin is fully explained and details are given of two technological processes of impregnation. The paper concludes with a summary of the typical properties and characteristics of the PDR laminates.