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preface to fifteenth edition

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TABLE 10.2<br />

Properties of Commercial Plastics (Continued)<br />

Fluorocarbon<br />

Melamine formaldehyde<br />

Properties<br />

Fluorinated<br />

ethylenepropylene<br />

resin<br />

Poly(vinylidene<br />

fluoride)<br />

Ethylene-tetrafluoroethylene<br />

copolymer<br />

Unfilled<br />

Glass-fiberreinforced<br />

Ethylenechlorotrifluoroethylene<br />

copolymer<br />

Cellulosefilled<br />

Glass-fiberreinforced<br />

Physical<br />

Melting temperature, C<br />

Crystalline 275 156 270 270 245 Thermoset Thermoset<br />

Amorphous<br />

Specific gravity 2.14–2.17 1.75–1.78 1.7 1.8 1.68 1.47–1.52 1.5–2.0<br />

Water absorption (24 h), % 0.01 0.04–0.06 0.03 0.02 0.01 0.1–0.8 0.09–1.3<br />

Dielectric strength, kV · mm 1 20–24 10 16 17 19 11–16 5–15<br />

Electrical<br />

Volume (dc) resistivity,<br />

ohm-cm<br />

Dielectric constant (60 Hz) 2.1 8–9 2.6 2.6<br />

Dielectric constant (10 6 Hz) 2.1 8–9 2.6 2.6<br />

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

(60 Hz) High<br />

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

High<br />

Mechanical<br />

Compressive modulus,<br />

10 3 lb · in 2 120 120 1200 240<br />

10.32

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