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preface to fifteenth edition

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TABLE 10.2<br />

Properties of Commercial Plastics (Continued)<br />

Polyamide<br />

Properties<br />

Nylon 6/9,<br />

molding and<br />

extrusion<br />

Molding<br />

Nylon 6/12<br />

Nylon 11,<br />

molding and<br />

extrusion<br />

Nylon 12,<br />

molding and<br />

extrusion<br />

Aromatic nylon<br />

(aramid),<br />

molded and<br />

unfilled<br />

30–35%<br />

glass-fiberreinforced<br />

Poly(amideimide),<br />

unfilled<br />

Compressive strength, rupture<br />

or 1% yield, 10 3 lb · in 2 2.4 7.5 30 40<br />

Elongation at break, % 1125 150 4 300 300 5 12–18<br />

Flexural modulus at 23C,<br />

10 3 lb · in 2 290 290 1120 150 165 640 664<br />

Flexural strength, rupture or<br />

yield, 10 3 lb · in 2 1.5 25.8 30<br />

Hardness, Rockwell (or Shore) R111 R114 E40–E50 R108 R106–R109 E90 E78<br />

Impact strength(Izod) at<br />

23C, J · m 1 59 53 139 96 107–300 75 133<br />

Tensile modulus, 10 3 lb · in 2 275 290 1200 185 180 730<br />

Tensile strengthat break,<br />

10 3 lb · in 2 8.5 8.8 24 8 8–9 17.5 26.9<br />

Tensile yield strength,<br />

10 3 lb · in 2 8.8<br />

Thermal<br />

Burning rate, mm · min 1<br />

Selfextinguishing<br />

Coefficient of linear thermal<br />

expansion, 10 6 C 90 55–100 67–100 40 36<br />

Deflection temperature under<br />

flexural load (264 lb · in 2 ),<br />

C 57–60 82 93–218 54 54 260 274<br />

Maximum recommended<br />

service temperature, C 100–120 260<br />

Specific heat, cal · g 1 0.4 0.58<br />

Thermal conductivity,<br />

W·m 1 ·K 1 0.22 0.34 0.22 0.22 0.25<br />

10.39

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