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preface to fifteenth edition

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TABLE 10.2<br />

Properties of Commercial Plastics (Continued)<br />

Thermoplastic elas<strong>to</strong>mers<br />

Vinyl<br />

Properties<br />

Polyolefin<br />

Polyester<br />

Block<br />

copolymers of<br />

styrene and<br />

butadiene or<br />

styrene and<br />

isoprene<br />

Block<br />

copolymers of<br />

styrene and<br />

ethylene or<br />

styrene and<br />

butylene<br />

Urea<br />

formaldehyde,<br />

alpha-cellulose<br />

filled<br />

Poly(vinyl chloride) and<br />

poly(vinyl acetate)<br />

Rigid<br />

Flexible and<br />

unfilled<br />

Compressive strength, rupture<br />

or 1% yield, 10 3 lb · in 2 25–45 8–13 0.9–1.7<br />

Elongation at break, % 150–300 350–450 500–1350 600–800 1 40–80 200–450<br />

Flexural modulus at 23C,<br />

10 3 lb · in 2 1.5–2.0 7–75 4–150 4–100 1300–1600 300–500<br />

Flexural strength, rupture or<br />

yield, 10 3 lb · in 2 10–18 10–16<br />

Hardness, Rockwell (or Shore) (A65–A92) (D40–D72) (A40–A90) (A50–A90) M110–M120 (D65–D95) (A50–A100)<br />

Impact strength (Izod) at<br />

23C, J · m 1 No break 208 <strong>to</strong> no break No break No break 13–21 21–1068 Varies over<br />

wide range<br />

Tensile modulus, 10 3 lb · in 2 1.1–2.5 0.8–50 1000–1500 350–600<br />

Tensile strength at break,<br />

10 3 lb · in 2 0.65–2.0 3.7–5.7 0.6–3.0 1–3 5.5–13 6–75 1.5–3.5<br />

Tensile yield strength,<br />

10 3 lb · in 2<br />

Thermal<br />

Burning rate, mm · min 1<br />

Selfextinguishing<br />

Selfextinguishing<br />

Slow <strong>to</strong> selfextinguishing<br />

Coefficient of linear thermal<br />

expansion, 10 6 C 130–170 130–137 22–36 50–100 70–250<br />

Deflection temperature under<br />

flexural load (264 lb · in 2 ),<br />

C 0–49 127–143 60–77<br />

Maximum recommended<br />

service temperature, C 77 70–74 80–105<br />

Specific heat, cal · g 1 0.6 0.2–0.28 0.36–0.5<br />

Thermal conductivity,<br />

W·m 1 ·K 1 0.19–0.21 0.15 0.30–0.42 0.15–0.21 0.13–0.17<br />

10.55

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