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Table 1 Characteristic properties of thermoset and thermoplastic materials Polymers EPOXY RESINS PEEK BISPHENOL A EPOXY NOVOLAC No filler Glass Mineral No filler Glass Mineral Unfilled 30% G.F. ISO 1.15 2.0–2.1 1.8–2.0 1.2 1.97 1.7 1.32 1.48 1183 ISO 0.1–0.2 0.02–0.8 0.30–0.80 – 0.04–0.06 0.11–0.20 0.06–0.2 0.14 62 ASTM 0.15–0.45 1 – – – – – – D325 Properties 6 0.6 – 3 – – 5 2.5 Specific gravity (g/cm 3) Water absorption (%) Thermal conductivity (k cal/m.h. °C) Thermal coefficient of expansion (10 –5/°C) 70–80 350–400 70 70 350–400 38 95 170 Tensile strength (MPa) 4.4 – – 2–5 – – >25 2 3.5 30 10–15 3.5 21–22 – 3.6 9.7 ASTM D 696 ISO R37 ISO R37 ISO R37 Elongation (%) Tensile modulus (GPa) 80–130 360 150–170 60–100 390 70–80 180 – ISO 178 1.1–2.7 6.4–8.2 2.2–2.7 2.7 7.0–9.2 2.2–2.7 – – ASTM D 256 Flexural strength (MPa) Impact strength (notched) (kg cm/cm) – 10 16 10 14 × – 1.4–5.5 2.1–1014 1015 × – 1.5 1015 × 6.1 IEC 93 > 16 18–22 15–16 – – 12–16 30 – IEC 243 0.032 0.024 0.013 0.029 0.015 – 0.003 – IEC 250 3.4 4.7–4.8 4.1–4.6 3.5 5.1 4.3–4.8 3.3 – IEC 250 Volume resistivity ( Ω cm) Dielectric strength (kV/mm) Power factor (tg) at 10 6 Hz Dielectric constant at 106 Hz 110 – – 150–200 – – 340 340 ISO 75 Heat distortion temperature (°C)
(cont.) Table 1 Polymers PHENOLICS POLYMIDES Properties No filler Wood flour Asbestos Fibre and fabric Mineral Nylon Unfilled Glass ISO 1.30–1.32 1.29–1.51 1.78–2.00 1.3–1.4 1.5–1.9 1.2–1.5 1.47 1.90 1183 ISO 0.30–0.40 0.70–1.20 0.03–0.30 0.50–1.6 0.04–0.25 0.25–0.4 0.68 0.20 62 ASTM – 0.15–0.45 0.15–0.25 0.3 0.3 – 0.60 – D325 4.3 3.6 – 3 1.8 – 5.4 1.5 Specific gravity (g/cm 3) Water absorption (%) Thermal conductivity (k cal/m.h. °C) Thermal coefficient of expansion (10–5/°C) 14–63 38–63 21–49 31–63 14–59 31–63 74 210 Tensile strength (MPa) ~ 5 ~ 5 ~ 5 ~ 5 4–9 – < 1.5 < 1 1.4–3.1 4.9–14.0 11–20.0 5.6–10.0 9.5–21.0 2.8–14.0 3.2 28–30 ASTM D 696 ISO R37 ISO R37 ISO R37 Elongation (%) Tensile modulus (GPa) 84–100 60 45–77 49–110 56–84 42–91 100 350 ISO 178 2.7–4.3 1–2.8 0.8–16 2–36 0.97–3.9 1.4–2.8 5 17 ASTM D 256 Flexural strength (MPa) Impact strength (notched) (kg cm/cm) 1015 × 9.2 1016–1017 1011–1014 10 10–1014 108–1012 108–1013 109–1013 10 10–1012 × 2.5 IEC 93 10–16 0.6–10 0.4–10 0.4–7 3–16 1–11 22 – IEC 243 0.04–0.05 0.015–0.06 0.03–0.25 0.03–0.08 0.007–0.08 0.15–0.2 0.005 0.0055 IEC 250 c/s) 3.9–6.5 5–6 4.8–7 4–6 3.7–4.5 3.4 4.7 4–9.7 (103 IEC 250 Volume resistivity ( Ω cm) Dielectric strength (kV/mm) Power factor (tg) at 10 6 Hz Dielectric constant at 106 Hz 150–180 130–180 – 250 180–200 – 300 350 ISO 75 Heat distortion temperature (°C)
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