Sealing technology manual for the process industry

EPDM in the pharmaceutical industry In addition to the cleaning media, EPDM materials are also suitable for aqueous pharmaceutical products. Thus, for ex- ample, EPDM materials are preferably used in the steriliza- ble biochemical reactor for the fermentation. Furthermore, EPDM is also used in autoclaves for steam pressure steriliza- tion of culture media for biotechnological production meth- ods. For the synthesis of many active ingredients, polar sol- vents such as ethanol or isopropanol are used. EPDM is the most suitable material for this. The exceptions are non-polar solvents and aliphatic products, such as water-in-oil emul- sions (W/O emulsions). In this case, a fluorinated elastomer should be used. EPDM in the chemical industry In the chemical industry, EPDM is recommended where polar solvents, aqueous salt solutions, diluted acids and alkaline solutions are used. Products and materials • O-rings made of 70 EPDM 291, 85 EPDM 292 and 70 EPDM 253815 • Molded parts made of 70 EPDM 291, 85 EPDM 292, 70 EPDM 253815 and 85 EPDM 302 • Butterfly valve seals made of 75 EPDM 253356 and 70 EPDM 253815 • Clamp seals made of 70 EPDM 291 and 70 EPDM 253815 • Diaphragms made of 70 EPDM 291 and 60 EPDM 290 • Elastomer bead of the Hygienic Usit® made of 70 EPDM 291, 70 EPDM 217676 and 70 EPDM 253815 • Profiles and cords made of 70 EPDM 391 Download Data sheet 70 EPDM 291 Download Data sheet 70 EPDM 253815 Fluoroprene® XP EPDM Temperature in °C 100 90 80 70 60 50 40 30 20 10 0 Fat in % 0 10 20 30 40 50 60 70 80 90 APPENDIX PRODUCT PORTFOLIO MATERIALS RESISTANCE & PURITY ENGINEERING PLASTICS ELASTOMERIC MATERIALS TECHNICAL FUNDAMENTALS INTRODUCTION according to the 3-A® Sanitary Standards, which have clas- sified EPDM as a Class II material. Nevertheless, EPDM is cer- tainly suitable for contact with perishable foods at low temperatures and less fatty media. In particular, its ex- cellent cleaning and sterilization properties, which no other elastomer in this price range offers, speak for EPDM. EPDM in the beverage industry EPDM is recommended for applications in the beverage in- dustry, since it shows very good performance in the aque- ous media of breweries, mineral water and soft drinks man- ufacturers. Whether beer, mineral water or flavored drinks – butterfly valve seals made of EPDM, for example, are best suited for the application. There are limitations in the con- tact with citrus juices and drinks with orange flavors. Be- cause of the same chemical nature of EPDM and limes, a ter- pene (the lead compound in orange flavor), it quickly leads to swelling of the material in continuous use. Another lim- itation is the flavor transfer between the produced drinks batches. This occurs especially in highly aggressive and complex assembled aromatic blends, like in energy drinks. 35 0102030405060708090

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