Standard_Parts_Catalogue

| Material Characteristics Page 2161 Technopolymer Symbol PC PP GF20 PSU PTFE Description Polycarbonate Polypropylene with 20% glass fibre Polysulfon Polytetra- fluorethylene Yield stress in MPa 63 33 70 4 Tensile strength in MPa – – 70 20 Tension-E-Module in MPa 2400 2900 2400 600 Ball indentation hardness in MPa 110 80 147 (H358/30) 26 Temperature resistance: • max. short-term • max. long-term • min. application temp. 140 °C 125 °C –100 °C 140 °C 100 °C 0 °C 180 °C 160 °C –100 °C 300 °C 260 °C –200 °C Resistance to: * • Oil, greases • Solvents: Tri Per • Acid: weak strong • Alkalines: weak strong • Petrol • Alcohol • hot water • UV light / weather exposure o – – + – – – – o – o + o o + + + + + + + o + o o o o + + – + + - + + + + + + + + + + + Fire behaviour (UL 94) V-2 – V-0 V-0 General Polycarbonates (amorphous) are translucent plastic materials with fol- lowing properties: High strength, in particular high impact resistance, good optical properties, self- extinguishing. but: sensitive to chemi- cals and stress cra- cking, not suitable for high dynamic stress loads, notch sensitive at edges and corners. Propylenes (parti- ally crystalline) are universal standard plastic materials with balanced pro- perty levels: Average strength, stiffness, impact resistance, low density, excellent chemical resistance but very bad cold temperature pro- perties. Embedded glass fibre, e.g. PP GF20, enhances stiffness and strength. Typical applications for propylenes are armatures. The primary feature of Polysulfon is its very high heat resistance and good resistance to chemicals. Typical fields of application are electrical engi- neering, electro- nics, mechanical engineering, and medical technology where high heat re- sistance is needed, while also allowing transparency. Polytetrafluor- ethylene is charac- terized in particular by very low friction coefficients and very high chemical and thermal resis- tance. PTFE is a preferred material for friction bearings, guides, seals, anti-stick coatings and insu- lators. * + resistant, o conditionally resistant, – non-resistant Material Characteristics of Plastics Materials and Elastomers continued