Lubricants nitrile rubber

Nitrile rubbers, including fiber-reinforced varieties, are used both as radial shaft-seal materials and as molded packing for reciprocating shafts. They have excellent resistance to a considerable range of chemicals, with the exception of strong acids and alkalis, and are at the same time compatible with petroleum-based lubricants. Their working temperature range is from —1°C to 107°C (30°F to 225°F) continuously and up to 150°C (302°F) intermittently. When used on hard shafts with a surface finish of, at most, 0.00038 mm root mean square (RMS), they have an excellent resistance to abrasion. 

There is no doubt that this grade of nitrile rubber is much more resistant to hot lubricating oils and high temperatures than is conventionally stabilized nitrile rubber (see Table 3). The main problem in this approach is the cost of producing a specialized rubber in relatively small quantity. 

OTHER COMMENTS used as a flame retarder and plasticizer in chlorinated rubber, nitrile rubber and resins used in coatings and adhesives based on plasticized cellulose esters used as a gasoline additive to control pre-ignition useful as a solvent in the extraction of phenol fi om gas-plant effluents and coke-oven wastewaters use as a synthetic lubricant, a waterproofing agent, a primary component of adhesives, and as an intermediate in the synthesis of pharmaceuticals. 

Ruororubbers and silicones are the best materials to make seals resistant to extreme temperature conditions. Viton, a fluororubber marketed by M/S Du Pont USA, can operate at 200°C in contact with oils and lubricants. Polysulfide rubbers have low compression set, but exhibit excellent fuel resistance. For improved compression set, it is admixed with relatively cheap conventional nitrile rubbers. The fluorine-containing rubbers, such as fluororubber, possess outstanding resistance to heat, fuels and hydraulic fluids coupled with extremely good aging characteristics. The reversible physical effects with respect to the ultimate tensile strength of this rubber vulcanizate is a noteworthy phenomenon since this is not associated with the deterioration of the rubber itself. Fluororubber is resistant to most fluids used in the aircraft industiy, such as synthetic, ester type lubricants, aromatic and aliphatic hydrocarbons, and water. 

In recent years the analysis of Isothermal point contacts has made considerable advances. Procedures have been developed to allow the simultaneous solution of the elasticity and Reynolds equations, and have provided many numerical results from which theoretical film thickness expressions have been derived. These solutions to the elastohydrodynamic problem may be divided Into two types. Firstly, where the lubricant viscosity Is significantly affected by the generation of pressure within the conjunction area the conditions are known as plezovlscous or hard elastohydrodynamic lubrication. Typical situations for this type of lubrication are steel bodies lubricated by a mineral oil, e.g. ball bearings. The second type of elastohydrodynamic lubrication Is that where the fluid experiences very little change In Its viscosity and Is therefore termed Isovlscous or soft elastohydrodynamic lubrication. This type of lubrication would be expected where the contacting materials are of low elastic modulus (e.g. nitrile rubber) lubricated by a mineral oil or a fluid of very low pressure-viscosity coefficient. (These two regimes of lubrication may also be described as... 

Uses Hard, dry, bonded release coating, lubricant for epoxies and thermosets, and natural, nitrile, SBR and silicone rubber Features For use on cool (< 200 F) surfaces Properties Colorless McLube 1708L [McLubej... 

Uses Plasticizer for rubber industry, CR, neoprene, nitrile, PC, other polymers textile surf, finishes softener thread lubricant antistat Properties Gardner 5 clear liq. sol. in hexane, toluene, kerosene, ethyl alcohol, acetone partly sol. in propylene glycol insol. in water m.w. 449 sp.gr. 0.984 vise. 18 cps f.p. -65 C acid no. 0.45 sapon. no. 240 hyd. no. 10 flash pt. 204 C ref. index 1.445 0.06% moisture... 

Uses Processing aid, lubricant for NR, nitrile, SBR, sulfur-cured and peroxide-cured EPDM, butyl rubber, epichlorohydrin reduces mixing time, aids dispersion of rubber additives, reduces compd. plasticity, improves mold flow food pkg. adhesives, coatings, rubber articles, closures with sealing gaskets for food containers... 

Uses Lubricant for aluminum can industry plasticizer for PVC, PVAc, PS, PC, cellulosics, rubber, CR, neoprene, nitrile as finish on twine for tying meat textile surf, finishes thread lubricant antistat softener Regulatory FDA 21CFR 178.3940 ManuUDistrib. C.P. Hall Inolex Trade Names TegMeR 804... 

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