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Materials for engineering, 3rd Edition - (Malestrom)

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Table 5.1 Some physical and mechanical properties of polymers<br />

Density E (GPa) Tensile T g (K) Thermal Thermal<br />

(Mg m –3 ) strength conductivity expansion<br />

(MPa) (W m –1 K –1 ) coefficient<br />

(K –1 × 10 –6 )<br />

Thermoplastics<br />

PE (low density) 0.92–0.93 0.17–0.28 8.3–31.0 163 0.33 100–220<br />

PE (high density) 0.95–0.98 1.07–1.09 22–31 183 0.48 60–110<br />

PP 0.90–0.91 1.14– 31–41 253 0.12 80–100<br />

Nylon 1.13–1.15 1.58–3.79 60–110 340 0.24 80–95<br />

POM 1.41 2.8–3.1 60–69 – 0.23 75<br />

PET 1.29–1.40 2.8 60 340–413 0.29 72<br />

PTFE 2.14–2.20 0.35 17–28 390 0.25 70–100<br />

PS 1.04–1.05 3.0–3.3 35–68 370 0.1–0.15 70–100<br />

PMMA 1.17–1.20 3.3 80–90 378 0.2 54–72<br />

Polycarbonate 1.20 2.3 70 423 0.193 70<br />

PVC 1.30–1.58 2.4–3.0 40–60 350 0.15 50–70<br />

Thermosets<br />

Epoxies 1.11–1.40 2.1–5.5 40–85 380 0.2–0.5 55–90<br />

Phenolics 1.24–1.32 8 35–55 308–320 0.12–0.24 26–60<br />

Elastomers<br />

NR 0.002–0.1 – 34–44 ~200<br />

SBR 1.5 0.004–0.1 – 224 ~0.15 ~600<br />

CR 0.94 ~0.001 – 233 0.12–0.24 26–60<br />

SIL 1.18–1.48 – 2.4–4.8 1.7–3.4 35

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