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preface to fifteenth edition

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TABLE 10.2<br />

Properties of Commercial Plastics (Continued)<br />

Acetal<br />

Properties Homopolymer Copolymer<br />

20% glassreinforced<br />

homopolymer<br />

25% glassreinforced<br />

copolymer<br />

21%<br />

poly(tetrafluoroethylene)-<br />

filled<br />

homopolymer<br />

Compressive strength, rupture or<br />

1% yield, 10 3 lb · in 2 5.29 16 (10% yield) 18 (10% yield) 17 (10% yield) 13 (10% yield)<br />

Elongation at break, % 25–75 40–75 7 3 15–22<br />

Flexural modulus at 23C,<br />

10 3 lb · in 2 380–430 375 730 1100 340–350<br />

Flexural strength, rupture or yield,<br />

10 3 lb · in 2 14 13 15 28<br />

Hardness, Rockwell (or Shore) M94 M78 M90 M79 M78<br />

Impact strength(Izod) at 23C,<br />

J·m 1 69–123 53–80 43 96 37–64<br />

Tensile modulus, 10 3 lb · in 2 520 410 1000 1250<br />

Tensile strengthat break,<br />

10 3 lb · in 2 10 10 8.5 18.5 7.6<br />

Tensile yield strength,<br />

10 3 lb · in 2 9.5–12 8.5 6.9–7.6<br />

Thermal<br />

Burning rate, mm · min 1 27.9<br />

Coefficient of linear thermal expansion,<br />

10 6 C 100 85 36–81 75<br />

Deflection temperature under flexural<br />

load (264 lb · in 2 ), C 124 110 157 163 100<br />

Maximum recommended service<br />

temperature, C 84<br />

Specific heat, cal · g 1 0.35<br />

Thermal conductivity,<br />

W·m 1 ·K 1 0.23 0.23<br />

10.23

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