Sealing technology manual for the process industry - NBR

Application profile NBR has very good properties in applications with mechan- ical stress and in oils, fats and waxes. Its temperature re- sistance in hot water is up to +100 °C (+212 °F). NBR cannot be used in concentrated acids (e.g. nitric acid, formic acid), concentrated oxidizing media (e.g. peracetic acid), and in aromatic and chlorinated hydrocarbons. Products and materials • O-rings made of 70 NBR 150 and 88 NBR 156 • Molded parts made of 70 NBR 150 and 88 NBR 156 • Diaphragms made of 62 NBR 152, 52 NBR 153 and 70 NBR 150 • Clamp seals made of 70 NBR 150 NBR (acrylonitrile-butadiene-rubber) is a polymer of buta- diene and acrylonitrile (ACN). The proportion of acryloni- trile can be between 18% and 50% and significantly af- fects the properties of the polymer. Thus, an NBR with a low acrylonitrile content is characterized by a very good low-temperature flexibility and good elastic properties. The higher the ACN content, the better the resistance against polar media. The gas permeability and flexibility at low temperature de- crease in this context. NBR is only used sporadically in the food industry. The remaining applications are usually charac- terized by high mechanical forces, where a large energy input into the seal takes place. NBR resists this quite well, if no high demands in terms of temperature are placed on it and if a particularly cost-effective solution is sought. General properties • Very good abrasion resistance • The acrylonitrile content must be selected for each application in such a way that the material shows the optimal combination of chemical resistance and low-temperature flexibility • Good mineral oil and fuel resistance and outstanding re- sistance to vegetable and animal oils, silicones, as well as to diluted acids and alkaline solutions at room tempera- ture • NBR tends to swell in aromatic and chlorinated hydrocar- bons, as well as in polar solvents • Temperature-resistant from –30 °C to +100 °C (–22 °F to +212 °F), special blends remain flexible at low tempera- tures down to –55 °C (–67 °F) 70 NBR 150 and 88 NBR 156 As a standard solution, Freudenberg offers within its NBR family the material 70 NBR 150. In addition, the compound 88 NBR 156 is also available as a harder version for special applications. NBR RULES AND STANDARDS 70 NBR 150 88 NBR 156 FDA-compliant (CFR 21 Part 177.2600) + + EU Reg. 1935/2004 EU Reg. 2023/2006 + + NSF 61 + Download Data sheet 70 NBR 150 Download Data sheet 88 NBR 156 APPENDIX PRODUCT PORTFOLIO MATERIALS RESISTANCE & PURITY ENGINEERING PLASTICS ELASTOMERIC MATERIALS TECHNICAL FUNDAMENTALS INTRODUCTION 37 RULES AND STANDARDS 70 NBR 15088 NBR 156

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