Reinforced PPS Injection-Molding Compounds

A comparison of the engineering properties of typical unfilled, glass-fiber-reinforced, and glass-fiber- and mineral-filled PPS compounds suitable 

TABLE 15.4 Typical Engineering Properties of Reinforced Poly(Phenylene Sulfide) Compounds 

Property Test method Unfilled 40% Glass fiber 65% Glass fiber and mineral 

A variety of grades are available within these two groups that provide slightly differing balances of plastic flow and mechanical properties. Special 40% glass-fiber-reinforced grades are available that have about 30% lower 

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The reinforcement of thermoplastics, notably polypropylene (PP) and polyamide (PA), with short glass fibers is a classical method to improve polymer mechanical properties. Fibers are dispersed more or less homogeneously in the polymer by melt compounding techniques such as twin screw extrusion to produce compounds ready for injection molding. Molded parts benefit from the better mechanical properties of the reinforcing fibers as the fibers bear a considerable part of the load applied to the composite structure. 

Analogous also to TS SMCs and BMC Is are TP molding compounds in sheet form, known as glass mat thermoplastics (GMTs), and compounded into standard granules for injection molding and extrusion. Most TPs are capable of combination with reinforcement. The main types used commercially are PA and PP. 

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