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preface to fifteenth edition

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TABLE 10.2<br />

Properties of Commercial Plastics (Continued)<br />

Polyolefin<br />

Poly(phenylene sulfide)<br />

Properties<br />

Polybutylene<br />

extrusion<br />

Homopolymer<br />

Polypropylene<br />

Copolymer<br />

Impact<br />

copolymer<br />

Polyallomer<br />

Injection<br />

molding<br />

40%<br />

glass-fiberreinforced<br />

Physical<br />

Melting temperature, C<br />

Crystalline 126 168 160–168 120–135 290 290<br />

Amorphous<br />

Specific gravity 0.91–0.925 0.90–0.91 0.89–0.905 0.90 0.90 1.3 1.6<br />

Water absorption (24 h),% 0.01–0.02 0.01–0.03 0.03 0.03 0.01 0.02 0.05<br />

Dielectric strength, kV · mm 1 18 24 24 24 31 15 18<br />

Electrical<br />

Volume (dc) resistivity,<br />

ohm-cm 10 17 10 17 10 17<br />

Dielectric constant (60 Hz) 2.2–2.6 2.3<br />

Dielectric constant (10 6 Hz) 2.2–2.6 2.3 2.3<br />

Dissipation (power) fac<strong>to</strong>r<br />

(60 Hz) 0.0005 0.0001–0.0005<br />

Dissipation fac<strong>to</strong>r (10 6 Hz) 0.0005–0.002 0.0001–0.0002 0.0003<br />

Mechanical<br />

Compressive modulus,<br />

10 3 lb · in 2 31 150–300<br />

10.46

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