Nitrile-silicone rubber

Ethylbenzene styrene Carbon disulphide 5% nitrile silicone rubber on Celite 545 at 135°C Flame ionisation 1 Omg L1 [642]... 

NSR nitrile-silicone rubber OES occupational exposure standard... 

Liquid Natural rubber Poly- chloroprene (Neoprene) Butyl rubber Butadiene- styrene rubber (7L5% styrene) Butadiene- acrylonitrile rubber (18% acrylo- nitrile) Silicone rubber (dimethyl siloxane)... 

If polypropylene is too hard for the purpose envisaged, then the user should consider, progressively, polyethylene, ethylene-vinyl acetate and plasticised PVC. If more rubberiness is required, then a vulcanising rubber such as natural rubber or SBR or a thermoplastic polyolefin elastomer may be considered. If the material requires to be rubbery and oil and/or heat resistant, vulcanising rubbers such as the polychloroprenes, nitrile rubbers, acrylic rubbers or hydrin rubbers or a thermoplastic elastomer such as a thermoplastic polyester elastomer, thermoplastic polyurethane elastomer or thermoplastic polyamide elastomer may be considered. Where it is important that the elastomer remain rubbery at very low temperatures, then NR, SBR, BR or TPO rubbers may be considered where oil resistance is not a consideration. If, however, oil resistance is important, a polypropylene oxide or hydrin rubber may be preferred. Where a wide temperature service range is paramount, a silicone rubber may be indicated. The selection of rubbery materials has been dealt with by the author elsewhere. ... 

Footnotes (a) Gaskets are also available in other materials, such as hydrogenated nitrile, neoprene, butyl rubber, hypalon, silicon rubber to meet various application requirrnents. (b) Viton is a Du Pont Co. trademark for a series of fluoroelastotners based on the copolymer ofvinylidene fluoride and hexafluoropropylene. 

Butyl Rubber and Halo-Butyl Rubber Ethylene Propylene Rubber (q) Hard Rubber (Ebonite) (h) Soft Natural Rubber (h) Neoprene (i) Nitrile Rubber Chlorosulphonated Polyethylene Polyurethane Rubber (v) Silicone Rubbers (k)... 

Rubber-like materials now superseding the traditional mastics and putties used in the building industry. Such sealants (also termed mastics) are based on butyl rubber, liquid polysulphides, silicone rubbers, polybutylene, nitrile rubbers and plasticised vinyl polymers. SEBS... 

A convenient term for any material possessing the properties of a rubber but produced from other than natural sources. A synthetic version of natural rubber has been available for many years with the same chemical formula, i.e., cis-1,4-polyisoprene, but it has not displaced the natural form. See also Butyl Rubber, Chloroprene Rubber, Ethylene-Propylene Rubber, Nitrile Rubber, Silicone Rubber and Styrene-Butadiene Rubber. 

Ethylene-propylene rubber Fluoro-rubber Hypalon Natural rubber Neoprene rubber Nitrile rubber Polysulphide rubber Polyurethane rubber Silicone rubber Styrene-butadiene rubber (SBR)... 

This puts this polymer remote from the usual range of silicone rubbers, which have solubility parameters of about 15 (mJ m 3)l/2, and close to polycarbonates, which have a value of 19.4 (mJnT3)172, and nitrile rubbers and polyvinyl acetates, which are similar. 

Polyurethane is superior to all Natural, chloroprene, SBR, and nitrile Silicone and fluoroelastomers Natural, SBR, and silicone rubbers Natural and SBR... 

Figure 10-18 presents the GC/MS analysis of a rubber formulation for an elastomeric insulator for devices to replace those that had been characterized after field-aging. In this example, a high quality silicone rubber was selected for inherent resistance to oxidation and UV damage, plus favorable dielectric properties. Figure 10-18 presents the GC/MS analysis of this elastomer, confirming pure silicone rubber and Tinuvin P, a UV absorbing polymer stabilizer. To reduce cost, many suppliers provide silicone rubber components that are often combined with butyl or nitrile rubber to reduce cost. 

Fig. 7 Swelling of rubber samples in organic solvents measured in the Diamond TMA. NR, natural rubber NBR, nitrile butyl rubber SiR, silicon rubber HR, isobutyl rubber. (Courtesy of the PerkinElmer Instruments, Norwalk, CT.)...

The main types of rubber used in the field of anti-corrosion are natural rubber, polyisoprene, polybutadiene, polyurethane, butyl rubber, styrene butadiene, nitrile rubber, ethylene propylene rubber, polychloroprene, silicone rubber, and vinylidene rubber. The wide ranges of available natural and synthetic rubbers offer a versatility of properties to suit almost every corrosive condition encountered in the process industries. 

Property Natural Rubber Butyl Rubber EPDM rubber Chloroprene rubber Nitrile rubber Silicone rubber Chloro sulfon ated polyethylene rubber... 

Elastomer Natural rubber Butyl rubber Chlorinated Butyl Rubber Nitrile rubber Silicone rubber Hypalon Chloroprene Viton EPDM EVA... 

Vapors from natural rubber (NR) produce a deep blue or blue-violet color, and those from styrene-butadiene rubber (SBR) pyrolysis turn the paper green or blue with a distinct green tinge. Polyisobutylenes and butyl rubber resemble NR, and silicone rubbers resemble SBR, in this color reaction. Pyrolytic vapors from nitrile rubbers, on the other hand, give a brown or brown-yellow color and those from polychloroprenes (neoprene) turn the test paper grey with a yellow tinge. 

Rubber consumption is dominated by tyre production. In these, conveyor belts, and pressure hoses, thin layers of either steel wire or polymeric fibre reinforcement take the main mechanical loads. These layers, with rubber interlayers, allow flexibility in bending, whereas the reinforcement limits the in-plane stretching of the product. The applications are dominated by natural rubber and styrene butadiene copolymer rubber (SBR). Other rubbers have specialised properties butyl rubbers have low air permeability, nitrile rubbers have good oil resistance, while silicone rubbers have high and low temperature resistance. Rubbers play a relatively small role in this book, but the rubbery behaviour of the amorphous phase in semi-crystalline thermoplastics is important. 

There is a relatively large range of different types of rubbers that are used in different components in the food industry that can get in contact with the food. The most important of these are natural rubber (NR ds-l,4-polyisoprene), nitrile rubber (i.e., acrylonitrile-butadiene copolymer), ethylene-propylene rubber (EPR), rubbers of ethylene-propylene monomer (EPM) and EPDM, SBR, fluorocarbon rubber, silicone rubber, polybutadiene rubber (BR), polychloroprene rubber, and TPE. In addition, there is the use of rubber blends, i.e., blends of NR and N Rr with SBR [19]. 

Rubbers are used mainly in the seals of packaging (i.e., for this, EPDM is used commonly, while nitrile polybutadiene rubber, and its derivates such as hydrogenated nitrile rubber and acrylates, fluoro-rubbers and silicones are all used for sealing oils and fuel containers, specifically). 

The types of rubber for the automotive industry can be considered in two groups tyres (mostly of NR, SBR, polybutadiene and butyl type rubbers), and profiles and seals (for profiles nitrile-butadiene rubber and derivatives, acrylates, fluoro-rubbers and silicones for sealing). 

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... 

Chem. Descrip. Fluoropolymer aq. emulsion Uses Release coating effective with a wide variety of elastomers and plastics incl. silicones, EPDM, nitrile, fluoroelastomers, and PU and esp. rec. for silicone rubber Features Water-based... 

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