Nitrile Rubber (NBR)

Nitrile Rubber is the most widely used elastomer in the seal Industry. Excellent resistance to petroleum products and its ability to be compounded for service over a wide temperature range has made Nitrile a very popular material.

It is a copolymer of butadiene and acrylonitrile. Specific properties can be achieved by varying the proportions of these individual polymers. Acrylonitrile content in Nitrile can be varied from 18% to 50% by weight. Nominal designations are ‘low’ (18 to 24%), ‘medium’ (28% to 33%) and ‘high’ (38% and higher) Nitrile. An increase in acrylonitrile content increases heat as well as chemical resistance to petroleum base oils and fuels but decreases low-temperature flexibility. Nitrite provides excellent compression set, tear resistance, cold flow, and abrasion resistance. The major downsides of Nitrile are its poor ozone and weather resistance and moderate heat resistance. Hydrogenated – NBR is used in applications requiring high wear and chemical resistance.

Royal Nitrile Rubber Compounds

Compound No. Material Material Colour Features Major Application
NB01 NBR90 NBR Black High modulus, high strenght, low compression set 'O' ring for satic sealing
NB02 NBR70 NBR Black Very low compression set Energizer rings for piston seal and road seals.O ring
NB03 NBR74 NBR Black Low copression set, self lubricating,wear Sealing element for PS024
NB04 NBR80 NBR Black Very low Comression set, Higher modulus Enerizer rings for piston seal( Eg. PS096, PS032)
NB06 NBR80 LNBR Black Very good low temperature resistance, Low compression set Energir ring for piston seal PS032-0
NB07 NBR70 LNBR Black Very good low temperature resistance, Low compression set Energizer rings for piston seal and road seals, O rings
NB10 NBR85 NBR Black High wear resistance, hydrolysis resistance Seals for heavy / high speed friction
NB11 XNBR80 X-NBR Black Very high wear resistance comparable to polyurethane Seals for heavy / high speed friction
NB12 HNBR70 H-NBR Black High temperature and chemical resistance Special purpose seal
VT01 FPM80 FPM Ash Black Very high resistance with excellent mechanical properties O ring for high temeperatur applications
VT04 FPM90 FPM Ash Black Very high heat resistance with excellent mechanical properties Seals for high temperature applications
FR51 NBRCF NBR + FABRIC Ash Black Fabric reinforced, high wear resistance, high modulus v' Packing
FR52 FPMCF FPM + FABRIC Brown Fabric reinforced, high temperature resistence,high wear resistnce, high modulus 'V' packing for high temperature application
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