NITRILE RUBBER ALSO KNOWN AS NBR OR BUNA N IS ONE OF THE MOST COMMONLY USED SEALING ELASTOMERS DUE TO ITS RESISTANCE TO PETROLEUM-BASED FUELS AND LUBRICANTS AND ITS RELATIVELY LOW PRICE. NITRILE ELASTOMERS ARE COPOLYMERS OF ACRYLONITRILE AND BUTADIENE. THERE ARE A NUMBER OF COMMON VARIATIONS OF NITRILE COMPOUNDS.UL STYLE""MARGIN-TOP0PX;PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" ACRYLONITRILE CONTENT THE ACRYLONITRILE (ACN) CONTENT OF THE POLYMER CHAINS CAN BE VARIED FROM 18 TO 50. LOWER ACN CONTENT GIVES BETTER LOW-TEMPERATURE PROPERTIES BUT POORER FUELS AND POLAR LUBRICANTS. HIGHER ACN CONTENT GIVES POORER LOW-TEMPERATURE PROPERTIES BUT IMPROVED FUELS AND POLAR LUBRICANTS RESISTANCE. STANDARD NBRS TYPICALLY HAVE 34 ACN CONTENT. CURE SYSTEM SULFUR-CURED STANDARD NITRILES ARE USUALLY SULFUR-CURED. SULFUR-CURED COMPOUNDS OFFER BETTER LOW-TEMPERATURE PROPERTIES BUT ARE MORE PRONE TO HARDENING WITH HIGH TEMPERATURES. PEROXIDE-CURED NITRILES HAVE BETTER HEAT RESISTANCE AND LOWER COMPRESSION SETS BUT ARE MORE EXPENSIVE AND MORE DIFFICULT TO PROCESS. TEMPERATURE RANGEUL STYLE""MARGIN-TOP0PX;PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" STANDARD LOW TEMP -40°C (-40°F) STANDARD HIGH TEMP 100°C (212°F)
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