1.Natural rubber NR
Natural rubber) is made of rubber tree latex, is a polymer of isoprene, with good wear resistance, high elasticity, tearing strength and elongation, easy to age in the air, become sticky when heated, easy to expand and dissolve in mineral oil or gasoline, alkali resistance but not strong acid resistance.
Pros:Good elasticity, acid and alkali resistance.
Cons:It is not resistant to weather and oil, and is a raw material for making tapes, hoses, and rubber shoes, and is suitable for making shock-absorbing parts, and products used in liquids with hydroxide such as automobile brake fluid and ethanol.
2.Styrene-butadiene rubber SBR
Styrene Butadiene Copolymer) butadiene and styrene copolymer, compared with natural rubber, uniform quality, less foreign matter, better wear resistance and aging resistance, but weak mechanical strength, can be mixed with natural rubber.
Pros:Low-cost non-oil-resistant material, good water resistance, good elasticity at a hardness of less than 70, and poor compressibility at a high hardness.
Cons:It is not recommended to use strong acids, ozone, oils and fats and most hydrocarbons. It is widely used in tire industry, shoe industry, cloth industry and conveyor belt industry.
3.Butyl rubber IIR
butyl rubber) is made of polymerization of isobutylene and a small amount of isoprene, because the movement of the three-dimensional obstacle molecules of methyl group is less than that of other polymers, so the gas permeability is less, the resistance to heat, sunlight and ozone is large, and the electrical insulation is excellent; It is highly resistant to polar solvents, and the general operating temperature range is -54 to 100 degrees Celsius.
Pros:It is impermeable to most general gases, has good resistance to sunlight and ozone, and can be exposed to animal or vegetable oils and chemicals.
Cons:It is not recommended to use it simultaneously with petroleum solvents, gum kerosene and aromatics. It can be used mainly for inner tubes, leather bags, rubber plaster, steam hoses, heat-resistant conveyor belts for automobile tires, etc.
4.EPDM
Ethylene propylenen rubber) is made of ethylene and propylene copolymerization, so it has excellent heat resistance, aging resistance, ozone resistance, and stability, but it cannot be sulfur added, and the general use temperature range is -50 to 150 degrees Celsius.
Pros:It has good weather resistance, excellent water resistance and chemical resistance, can use alcohols and ketones, high temperature steam resistance, and good impermeability to gas.
Cons:Not recommended for use in the food industry. It can be used for seals in high-temperature water vapor environments and rubber parts in braking systems.
5.Nitrile NBR
Nitrile rubber) is made of acrylonitrile and butadiene copolymerization, acrylonitrile content from 18%-50%, the higher the acrylonitrile content, the better the resistance to petrochemical oil hydrocarbon fuel oil, but the low temperature performance becomes worse, the general use temperature range is -25-100 degrees Celsius. Nitrile rubber is one of the most commonly used rubbers for oil seals and O-rings.
Pros:It has good anti-oil, anti-water, anti-solvent and anti-high-pressure oil characteristics, and has good compressibility, anti-wear and elongation.
Cons:Not suitable for use with polar solvents such as ketones and ozone.
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