Butadiene-nitrile rubbers
Grades
SKN-18 S Rubber, SKN-18 SM RubberSKN-26 S Rubber, SKN-26 SM Rubber
SKN-33 S Rubber, SKN-33 SM Rubber
SKN-40 S Rubber, SKN-40 SM Rubber
Main properties
Synthetic butadiene-nitrile rubber (SKN) is a polymer produced through chemical synthesis: copolymerization of butadiene and acrylonitrile in emulsion – rubber emulsion polymerization. As of its chemical composition butadiene-nitrile rubber is a copolymer of butadiene and nitrile of acrylic acid.Butadiene-nitrile rubbers belong to the most important special purpose rubbers and are the major type of oil- and gasoline-resistant rubber.
SKN rubbers give some specific qualities to the rubbers which are produced on their base, : increased resistance to oil, gasoline, temperature and frost exposure, gas-tightness and resistance to hostile environment. But the most distinctive feature of this kind of rubbers is its frost resistance.
SKN rubbers are technologically compatible with other rubbers such as butadiene, styrene butadiene, polysulfide. SKN Rubbers can be mixed with polyvinylchloride, perchlorovinyl and phenol-formaldehyde resin, copolymer of styrene and acrylonitrile and with other resins.Purpose
Butadiene nitrile rubbers are applied in the production of various oil- and gasoline resistant goods. This kind of rubbers is also used as plasticizer for plastics on the base of which various shock-proof materials are made.
Resistance of butadiene-nitrile rubbers to oils, hydrocarbons and other aggressive media provided extensive use of these rubbers in the making of:o wide range of industrial rubber articles:o sealing parts, plugs, rings, cups, gaskets, membranes, soft tare, hoses, polygraphic offset plates, drive belts, etc.o acid- and alkali-resistant rubber applied as aniticorrosive materials for the inner surfaces of mechanisms working in aggressive media.o fuel tanks coatings in automotive, aviation and petroleum industries, hoses, heatproof ebonite with high mechanical durability and resistance to chemical agents, for the making of coatings in electrical wires. o rubber mixtures working in difficult conditions, such as mineral oils and ammoniao food-contacting products.o oil- and gasoline-resistant footwear, hills and soles.Technical characteristics
| SKN rubber | 18S | 18SM | 26S | 26SM | 33S | 33SM | 40S | 40SM |
Mooney viscosity, MB 1+4 (100°С) | ||||||||
| 1st group | - | 45-55 | - | 45-55 | - | 45-55 | - | 45-55 |
| 2nd group | - | 56-66 | - | 56-66 | - | 56-66 | - | 56-70 |
| Conditional tensile strength, not less than | ||||||||
| 1st group, MPa | 17,6 | 15,7 | 24,0 | 22,5 | 24,5 | 22,5 | 23,5 | |
| 1st group, kgs/cm2 | 180 | 160 | 245 | 230 | 250 | 230 | 250 | 245 |
| 2nd group MPa | - | 16,7 | - | 23,5 | - | 23,5 | 24,5 | |
| 2 nd group, kgs/cm2 | - | 170 | - | 240 | - | 240 | 250 | |
| Amount of bonded nitrile of acrylic acid, % | 17-20 | 17-20 | 27-30 | 27-30 | 31-35 | 31-35 | 36-41 | 36-41 |
| Mass of organic acids, %, not more than | 4,5 | 4,5 | 4,5 | 4,5 | 4,5 | 4,5 | 4,5 | 4,5 |
| Frost-resistance index at -25 °С, not less | 0,33 | 0,27 | - | - | - | - | - | - |
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