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preface to fifteenth edition

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TABLE 10.2<br />

Properties of Commercial Plastics (Continued)<br />

Epoxy<br />

Fluorocarbon<br />

Properties<br />

Unfilled<br />

Casting resin<br />

Flexible<br />

Novolac resin<br />

Mineral-filled<br />

Poly(tetrafluoroethylene)<br />

Granular<br />

Glass-fiberreinforced<br />

Poly(chlorotrifluoroethylene)<br />

Perfluoroalkoxy<br />

Physical<br />

Melting temperature, C<br />

Crystalline Thermoset Thermoset Thermoset 327 327 220 310<br />

Amorphous<br />

Specific gravity 1.11–1.40 1.05–1.35 1.7–2.1 2.14–2.20 2.2–2.3 2.1–2.2 2.12–2.17<br />

Water absorption (24 h), % 0.08–0.15 0.27–0.50 0.05–0.2 0.01 0.03<br />

Dielectric strength,<br />

kV · mm 1 11.8–19.7 9.3–15.8 11.8–13.8 18.9 12.6 19.7–23 19.7<br />

Electrical<br />

Volume (dc) resistivity,<br />

ohm-cm 10 12 –10 17 10 18 10 18<br />

Dielectric constant (60 Hz) 3.5–5.0 2.1 2.3–2.7<br />

Dielectric constant (10 6 Hz) 3.5–5.0 2.1 2.3–2.5<br />

Dissipation (power) fac<strong>to</strong>r (60<br />

Hz) 0.0002 0.001<br />

Dissipation fac<strong>to</strong>r (10 6 Hz) 0.0002 0.005<br />

Mechanical<br />

Compressive modulus,<br />

10 3 lb · in 2 60<br />

10.30

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