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preface to fifteenth edition

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TABLE 10.2<br />

Properties of Commercial Plastics (Continued)<br />

Polycarbonate<br />

Thermoplastic polyester<br />

Properties<br />

Poly(aryl<br />

ether),<br />

unfilled<br />

Low<br />

viscosity<br />

30% glassfiber<br />

reinforced<br />

Poly(butylene terephthalate)<br />

Unfilled<br />

30% glass-fiberreinforced<br />

Poly(ethylene terephthalate)<br />

Unfilled<br />

30% glass-fiberreinforced<br />

Compressive strength, rupture<br />

or 1% yield, 10 3 lb · in 2 12.5 18 8.6–14.5 18–23.5 11–15 25<br />

Elongation at break, % 80 110 3–5 50–300 2–4 50–300 3<br />

Flexural modulus at 23C,<br />

10 3 lb · in 2 300 340 1100 330–400 1100–1200 35–450 1440<br />

Flexural strength, rupture or<br />

yield, 10 3 lb · in 2 11 13.5 23 12–16.7 26–29 14–18 33.5<br />

Hardness, Rockwell (or Shore) R117 M70 M92 M68–M78 M90 M94–M101 M100<br />

Impact strength (Izod) at<br />

23C, J · m 1 427 14 107 43–53 69–85 13–32 101<br />

Tensile modulus, 10 3 lb · in 2 320 345 1250 280 1300 400–600 1440<br />

Tensile strength at break,<br />

10 3 lb · in 2 7.5 9.5 19 8.2 17–19 8.5–10.5 23<br />

Tensile yield strength,<br />

10 3 lb · in 2 9.0<br />

Thermal<br />

Burning rate, mm · min 1<br />

Selfextinguishing<br />

Selfextinguishing<br />

Coefficient of linear thermal<br />

expansion, 10 6 C 65 68 22 60–95 25 65 29<br />

Deflection temperature under<br />

flexural load (264 lb · in 2 ),<br />

C 149 138–145 146 50–85 220 38–41 224<br />

Maximum recommended<br />

service temperature, C 143<br />

Specific heat, cal · g 1 0.3 0.27<br />

Thermal conductivity,<br />

W·m 1 ·K 1 0.30 0.20 0.22 0.18–0.30 0.30 0.15<br />

10.41

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