Sealing technology manual for the process industry - HNBR

HNBR cannot be used in concentrated acids (e.g. nitric acid, formic acid) and concentrated oxidizing media (e.g. per- acetic acid). HNBR in the beverage industry Since HNBR has good fat and oil resistance, it is always an interesting alternative material for the beverage industry. The use of essential oils in particular, such as those con- tained in hops, can be reliably ensured here by HNBR. Products and materials • O-rings made of 75 HNBR 231142 • Molded parts made of 70 HNBR 254067 and 85 HNBR 216553 • Butterfly valve seals made of 70 HNBR 254067 • Diaphragms made of 75 HNBR 181070 and 85 HNBR 181071 HNBR (hydrogenated-acrylonitrile-butadiene-rubber) is a material that is generated by full or partial hydrogenation of the double bond-containing butadiene portions of nor- mal NBR polymers. Thus, HNBR offers a similar chemical resistance to NBR, but has better heat and oxidation sta- bility. Furthermore, the material is characterized by high mechanical strength and improved abrasion resistance. HNBR is often used in dairies, cheese-making facilities and other milk-processing plants, where the fat content of the product to be processed is so high that EPDM is no longer deployable. General properties • Partly higher chemical resistance than NBR • Better heat and oxidation stability than NBR • High mechanical strength • Improved abrasion resistance • Can be used well in water, steam and ultrapure water • Temperature-resistant from –30 °C to +150 °C (–22 °F to +302 °F) 75 HNBR 231142, 70 HNBR 254067 and 85 HNBR 216553 Application profile HNBR is very well suited for use under mechanical stress, as well as in oils and waxes, animal and vegetable fats. More- over, the material is suitable for use in CIP/SIP media with continuously operating plants in the food and pharmaceu- tical industries. In these processes, diluted acids and alka- line solutions with cleaning additives, as well as disinfect- ants, steam or slightly oxidizing media or polar and organic solvents, such as acetic acid, are used. RULES AND STANDARDS 75 HNBR 231142 70 HNBR 254067 85 HNBR 216553 FDA-compliant (CFR 21 Part 177.2600) + + + HNBR Elastomeric materials 38

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