Standard_Parts_Catalogue

Page 2160 | Material Characteristics Technopolymer Symbol PE-HD PE-LD POM-C POM-H Description Polyethylene high density Polyethylen low density Polyacetal (Copolymer) Polyacetal (Homopolymer) Yield stress in MPa 30 10 65 72 Tensile strength in MPa 25 ... 30 8 ... 10 – 70 Tension-E-Module in MPa 1450 200 2700 3100 Ball indentation hardness in MPa 57 (Standard H132/30) 15 (Standard H49/30) 145 174 Temperature resistance: • max. short-term • max. long-term • min. application temp. 100 °C 90 °C -80 °C 100 °C 70 °C –80 °C 140 °C 90 °C –50 °C 140 °C 80 °C –50 °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 Fire behaviour (UL 94) HB HB HB HB General Polyethylene is a very versatile thermoplas- tic polymer. It is colorless in its basic form. Polyethylene is physiologically safe, practically odorless, and tasteless. These properties make it ideal for the food and packaging industry. Polyethylene is shockproof and impact- resistant. It has good sliding properties and absorbs virtually no moisture. Polyacetals (partially crystalline) are universal materials used in function components for precision engineering and in apparatus construction. They feature excellent properties: - low friction resistance - good abrasion resistance - good resilience - good fatigue resistance - good chemical resistance Typical applications include snap-fit elements (form-locking connecting elements). * + resistant, o conditionally resistant, – non-resistant Material Characteristics of Plastics Materials and Elastomers continued