Application technology 12 Materials Thermal and general chemical resistance Materials (selection) Symbol general chemical resistance permissible temperatures (neutral media) constant short-term Stainless steels 1.4016, 1.4301 (V2A) 1.4401 (V4A), 1.4571 (V4A) 1.4031, 1.4034, 1.4305, 1.4306, 1.4310, 1.4408 for neutral and corrosive media –20 °C to +400 °C Aluminium (aluminium compounds) EN AW-6060 EN AW-6063 EN AW-6082 EN AC-46100 for neutral media –20 °C to +170 °C Brass CW617N-DW CW617N CW614N for neutral media –20 °C to +250 °C Lead-free brass CW508L-DW for neutral media –20 °C to +250 °C Thermoplastic Polyoxymethylene POM Resistant to oils and bases, not resistant to inorganic acids. +40 °C to +120 °C Polyvinyl chloride, hard PVC Resistant to most acids, bases, saline solutions. 0 °C to +60 °C 0 °C to +60 °C Polypropylene PP Resistant to watery solutions of acids, bases and salts as well as a large number of organic solvents. Not suitable for concentrated oxidising acids. 0 °C to +90 °C 0 °C to +100 °C Polyethylene PE Polyamide PA Resistant to oils, fats, waxes, fuels, weak alkalis, aliphatic and aromatic hydrocarbons. 0 °C to +100 °C Polytetrafluorethylene (Teflon) PTFE Resistant to almost all chemicals. Not resistant to liquid sodium compounds. –20 °C to +200 °C –20 °C to +260 °C Polyvinylidene fluoride PVDF Not resistant to hot solvents as well as ketones, esters and strong alkaline solutions. –20 °C to +100 °C Polyphenyl sulphide PPS Resistant to diluted mineral acids, bases, aliphatic and aromatic hydrocarbons, oils and fats, water. Hydrolysis-resistant. up to +200 °C Elastomers (sealing materials) Ethylene prophylene rubber EPDM (A) Good resistance to ozone and weather. Particularly suitable for aggressive chemicals. Unfavourable for oils and fats. –30 °C to +130 °C Fluororubber FKM The chemical properties are are the most favourable of all elastomers. –10 °C to +150 °C –10 °C to +200 °C Nitrile rubber NBR (B) Good resistance to oils and petrol. Unfavourable with oxidising media. –10 °C to +90 °C –10 °C to +120 °C Styrene butadiene rubber SBR Resistant to oils and petrol to a limited extent only. Not suitable for oxidising media. –40 °C to +80 °C Silicone VMQ Good resistance to alcohols, oxidizing media media, animal and vegetable oils and fats Conditionally suitable for acids and bases, solvents Not suitable for fuels and hydrocarbons, aromatic and chlorinated solvents superheated steam above 120 °C –60 °C bis 200 °C 235 GEKA® Main Catalogue
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