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preface to fifteenth edition

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TABLE 10.2<br />

Properties of Commercial Plastics (Continued)<br />

Thermoplastic polyester<br />

Thermosetting and alkyd polyester<br />

Aromatic polyester<br />

Unsaturated polyester<br />

Alkyd molding compounds<br />

Properties<br />

Injection<br />

molding<br />

Styrene-maleic<br />

acid copolymer,<br />

low-shrink<br />

Extrusiontransparent<br />

Butadienemaleic<br />

acid<br />

copolymer<br />

Putty,<br />

mineral-filled<br />

Glass-fiberreinforced<br />

Polyimide,<br />

unfilled<br />

Compressive strength, rupture<br />

or 1% yield, 10 3 lb · in 2 10 15–30 14–30 12–38 15–36 30–40<br />

Elongation at break, % 225 7–10 3–5 8–10<br />

Flexural modulus at 23C,<br />

10 3 lb · in 2 290 700 1000–2500 2000 2000 450–500<br />

Flexural strength, rupture or<br />

yield, 10 3 lb · in 2 10.6 12 9–35 16–24 6–17 8.5–26 19–28.8<br />

Hardness, Rockwell (or Shore) R105 40–70 (Barcol) 50–60 (Barcol) E98 E95 E52–E99<br />

Impact strength (Izod) at<br />

23C, J · m 1 101 133–800 214–694 16–27 27–854 80<br />

Tensile modulus, 10 3 lb · in 2 300 1000–2500 1500–2500 500–3000 300<br />

Tensile strength at break,<br />

10 3 lb · in 2 6 11 4.5–20 5–10 3–9 4–9.5 10.5–17.1<br />

Tensile yield strength,<br />

10 3 lb · in 2 7 12.5<br />

Thermal<br />

Burning rate, mm · min 1<br />

Coefficient of linear thermal<br />

expansion, 10 6 C 29 6–30 20–50 15–33 45–56<br />

Deflection temperature under<br />

flexural load (264 lb · in 2 ),<br />

C 63 282 190–260 160–177 177–260 204–260 277–360<br />

Maximum recommended<br />

service temperature, C<br />

Specific heat, cal · g 1 0.27<br />

Thermal conductivity,<br />

W·m 1 ·K 1 0.29 0.76–0.93 0.51–0.89 0.6–0.89 0.10–0.11<br />

10.43

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