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preface to fifteenth edition

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TABLE 10.2<br />

Properties of Commercial Plastics (Continued)<br />

Cellulosic<br />

Epoxy<br />

Properties<br />

Celluloseacetate<br />

butyrate resin,<br />

molding<br />

Celluloseacetate<br />

propionate<br />

resin, molding<br />

Ethyl<br />

cellulose<br />

Cellulose<br />

nitrate<br />

Chlorinated<br />

polyether<br />

Bisphenol<br />

Glass-fiberreinforced<br />

Mineralfilled<br />

Physical<br />

Melting temperature, C<br />

Crystalline 140 190 135 125 Thermoset Thermoset<br />

Amorphous<br />

Specific gravity 1.15–1.22 1.17–1.24 1.09–1.17 1.35–1.40 1.4 1.6–2.0 1.6–2.1<br />

Water absorption (24 h), % 0.9–2.2 1.2–2.8 0.8–1.8 0.04–0.20 0.03–0.20<br />

Dielectric strength, kV · mm 1 9–13 12–17.7 13.8–19.7 9.8–15.7 9.8–15.7<br />

Electrical<br />

Volume (dc) resistivity,<br />

ohm-cm 10 10 –10 12 10 10<br />

Dielectric constant (60 Hz) 3.5–6.4 7.0–7.5<br />

Dielectric constant (10 6 Hz) 3.2–6.2 3.01 6.6<br />

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

(60 Hz) 0.01–0.04<br />

Dissipation fac<strong>to</strong>r (10 6 Hz) 0.01–0.04<br />

Mechanical<br />

Compressive modulus,<br />

10 3 lb · in 2 3000<br />

10.28

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