High-pressure glass-fiber-reinforced

In cavity-compression molding the cold powder or mold material is placed under pressure in a heated mold. The process is also called hot pressing. Glass-fiber-reinforced, unsaturated polyester resins are processed by the heated-cavity-compression molding method. The vulcanization of rubber can also be carried out using this method. High-fidelity records are pressed out of the thermoplasts PVC or poly(ethylene-co-vinyl acetate), while cheaper records are injection molded. 

Creep pressure tests with glass fiber reinforced pipe according to DIN 53768 confirm the linear curve in a double logarithmic plot, but also the problematic tendency to infinitely high values at short times in a double-linear plot, Figure 6.8 [1014]. 

A flat 40 mm by 230 mm plaque with a thickness of 3 mm was used to represent the low pressure mold filling application. The material used was an ABS that was dried at 85°C for three to four hours. The same 40 by 230 mm plaque was used, but with a thiekness of 1.5 mm, to represent the high pressure mold filling apphcation. The material used was a 40% long glass fiber reinforced polypropylene. 

High performance composites may be laminates wherein veils of carbon fiber ate treated with an epoxy resin, stacked up to the desired final product thickness, and then laminated together under heat and pressure (see Composite materials Carbon and graphite fibers). Simply mixing together carbon or glass fibers and polymeric resins to form a reinforced plastic leads to a composite material, but this is not a laminate if not constmcted from discrete phes. 

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