ETFE TabLE foR Head cover and clamping chemistRY compatibiLitY disc are made of thick PTFE ETFE/ FFKM walled molded ETFE with ECTFE metal core for unsurpassed Acid amides ++ ++ ++ Dimethylformamide (DMF), Acetamide, Formamide long-term performance . Acids, dilute or weak ++ ++ ++ . Acetic acid, Carbonic acid, Butyric acid DATA TERATURE NG I Acids, strong or concentrated ++ ++ ++ E S PTFE Hydrochloric acid, Sulfuric acid, Nitric acid, S LI THE UENC OU Trifluoroacetic acid (TFA) I FL ON N Alcohols, aliphatic VAR ++ ++ ++ I E Methanol, Ethanol, Butanol L B Well-proven PTFE ANCE ROM LI SSI Aldehydes ++ ++ ++ F O sandwich diaphragms for RE Formaldehyde, Ethanal, Hexanal ON I F P increased reliability and ER O S U Amines ++ ++ + Y extended service life N-Methyl-2-pyrrolidone (NMP), Triethylamine ET I ORMAT F ROM N VAR F I Bases ++ ++ ++ Sodium hydroxide, Potassium hydroxide, Ammonia ON VED THE I ED TO Esters S ++ ++ ++ FFKM DER Ethyl acetate, Butyl formate, Amyl butyrate BA UE BE Y . D ARE Ethers ++ ++ ++ MA Diethyl ether, Tetrahydrofurane, Dioxane S DATA Inlet and outlet flapper M DATA E I S Hydrocarbons, aliphatic A ++ ++ ++ L valves are made of FFKM HE C Pentane, Hexane, Heptane THE L or PTFE for both highest F O Hydrocarbons, aromatic ++ ++ ++ EGA leakage tightness and best Y Benzene, Toluene, Xylene L chemical resistance O Hydrocarbons, halogenated ++ ++ ++ . N DE I Methyl chloride, Chloroform, Ethylene chloride ACCURAC GU A Ketones THE ++ ++* ++ S ECTFE Acetone, Cyclohexanone A Oxidizing acids, oxidizing agents ++ + ++ LY ARRANT ON Ozone, Hydrogen peroxide, Chlorine W ERVE Sulfoxides ++ ++ ++ NOT Valve connectors are made S CHEMISTRY COMPATIBILITY of ECTFE for an optimum Dimethyl sulfoxide (DMSO) S CAN of VACUUBRAND Chemistry Diaphragm Pumps DOE of thermal, mechanical and Y chemical resistance THE POLYTETRAFLUOROETHYLENE exceLLENT CHEMICAL RESISTANCE PTFE: ++ S, ETFE: ETHYLENE TETRAFLUOROETHYLENE + good TO LIMITED CHEMICAL ECTFE: ETHYLENE RESISTANCE CHLOROTRIFLUOROETHYLENE ACTOR ©VACUUBRAND GMBH + CO KG . 05/2017 EN/995512 T VACUUBRAND Internal tubing and fittings – pooR CHEMICAL RESISTANCE F FFKM: PERFLUORO ELASTOMER made of PTFE/ETFE/ECTFE * for some solvents ‘+’ compounds VACUUBRAND GMBH + CO KG T +49 9342 808-5550 Alfred-Zippe-Straße 4 F +49 9342 808-5555 97877 Wertheim [email protected] Technology for Vacuum Systems Germany www.vacuubrand.com PTFE ETFE UncompRomising One of the most distingu- Ethylene tetrafluoroethyle- chemistRY design ishing properties of PTFE is its ne (ETFE) is a thermoplastic PTFE ETFE outstanding chemical resis- fluoropolymer and can be tance, except for some extre- processed using molding foR diaphRagm PUmps me conditions such as molten techniques. Injection-molding alkali metals or elemental around inserts (stability cores) fluorine. Basically PTFE is not results in dense nonporous Fluoropolymers and perfluoro elastomers soluble in any organic sol- surfaces not achievable are materials containing fluorine atoms vents. Even aggressive acids with parts machined from in their chemical structures. Due to their such as aqua regia cannot at- sintered PTFE. It has excellent outstanding chemical resistance and their tack PTFE. The reason for this mechanical properties, very extremely low surface energy – for low is a particularly strong bond good chemical resistance material adhesion – VACUUBRAND uses between the carbon and the (similar to PTFE), high tensile these materials for all media-contacted fluorine atoms and the shiel- strength, high flexibility, parts in their chemical diaphragm ding of carbon atoms by the excellent impact strength, surrounding fluorine atoms. moderate stiffness, good vacuum pumps. abrasion resistance, and high cutting resistance. ETFE that has been modified by carbon fiber reinforcement is tougher and stiffer and has higher tensile strength than PTFE, PFA or FEP. FFKM ECTFE Perfluoroelastomers contain Ethylene chlorotrifluoroe- fully fluorinated polymer thylene is prepared by the chains and hence offer the copolymerization of ethylene ultimate performance of and chlorotrifluoroethyle- elastomers when considering ne (CTFE). While it still has heat and chemical resistance. excellent chemical resistance, FFKM parts resist over 1,800 different chemicals, while the strength, wear resistance offering the high temperature and creep resistance of stability of PTFE. The long- ECTFE are significantly greater term, proven performance than that of PTFE. ECTFE is of FFKM means less frequent the most abrasion-resistant FFKM ECTFE valve changes, repairs and in- and highest tensile strength spections, increasing process fluoropolymer available. and equipment uptime for Reinforcement by carbon greater productivity and yield. fiber enhances its mechanical FFKM also helps to prevent process contamination in and thermal properties. pharmaceutical, food and semiconductor applications..