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preface to fifteenth edition

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TABLE 10.2<br />

Properties of Commercial Plastics (Continued)<br />

Styrenic<br />

Polystyrene<br />

Acrylonitrile-butadiene-styrene copolymer<br />

Molding<br />

Properties<br />

Extrusion<br />

High-impact<br />

Heatresistant<br />

Heatresistant<br />

Flameretarded<br />

Platable<br />

20% glassreinforced<br />

Physical<br />

Melting temperature, C<br />

Crystalline<br />

Amorphous 110–125 88–120 110–125 100–110 110–125 100–110<br />

Specific gravity 1.05–1.09 1.02–1.06 1.05–1.08 1.01–1.04 1.16–1.21 1.06–1.07 1.22<br />

Water absorption (24 h), % 0.03–0.12 0.20–0.45 0.20–0.45 0.20–0.45 0.2–0.6<br />

Dielectric strength, kV · mm 1 20 14–20 14–20 14–20 14–20 16–22 18<br />

Electrical<br />

Volume (dc) resistivity,<br />

ohm-cm<br />

Dielectric constant (60 Hz) 2.4–5.0<br />

Dielectric constant (10 6 Hz) 2.4–3.8<br />

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

(60 Hz) 0.003–0.008<br />

Dissipation fac<strong>to</strong>r (10 6 Hz) 0.007–0.015<br />

Mechanical<br />

Compressive modulus,<br />

10 3 lb · in 2 150–390 190–440 140–300 130–310<br />

10.50

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