Polymer Bearings - igus® - #40

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38 General properties Density (g/cm3) 1.4 1.49 1.71 1.53 1.66 Colour brown black grey cream grey Max. moisture absorption at +23 °C/50 % r. h. (% weight) 0.3 0.1 0.1 0.1 0.1 Max. moisture absorption (% weight) 1.1 0.5 0.3 0.3 0.1 Coeffi cient of sliding friction. dynamic against steel (ì) 0.06–0.14 0.20–0.36 0.07–0.2 0.06–0.2 0.07– pv value. max. (dry) against a steel shaft. +20 °C. wall thickness 1 mm MPa · m/s 0.84 0.35 1.37 0.80 0.74 Mechanical properties Modulus of elasticity (MPa) 2,400 16,000 12,500 2,800 11,100 Tensile strenght at +20 °C (MPa) 95 260 175 55 135 Compressive strength (axial) (MPa) 65 140 81 78 79 Max. permissible static surface pressure (+20 °C) (MPa) 150 140 90 80 75 Shore-D-hardness 81 86 87 77 82 Physical and thermal properties Max. long term application temperature (°C) +250 +250 +200 +200 + Max. short term application temperature (°C) +310 +300 +240 +240 + Min. application temperature (°C) –100 –100 –40 –40 – Thermal conductivity [W/m · K] 0.62 0.6 0.6 0.24 0.5 Coeffi cient of thermal expansion (+23 °C) [K–1 · 10–5] 4 4 4 6 Electrical properties Specifi c volume resistance (Ùcm) > 1011 1012 1011 1011 < Page 299 313 325 337 347 More information www.iglidur.eu