Natural rubber NR

(Natural Rubber) is made from latex collected from rubber trees, which is a polymer of isoprene. Has good wear resistance, high elasticity, breaking strength and elongation. It is easy to age in the air, becomes sticky when heated, expands and dissolves easily in mineral oil or gasoline, and is resistant to alkali but not strong acid. Advantages: good elasticity, acid and alkali resistance. Disadvantages: Not heat-resistant, not oil-resistant (vegetable oil-resistant), it is the raw material for making tapes, hoses, and rubber shoes, and is suitable for making shock-absorbing parts, products used in automobile brake fluid, ethanol and other liquids with hydroxide radicals.

Styrene Butadiene Rubber SBR

(Styrene Butadiene Copolymer) Copolymer of butadiene and styrene, compared with natural rubber, has uniform quality, less foreign matter, better wear resistance and aging resistance, but weaker mechanical strength, can be mixed with natural rubber Use together. Advantages: low-cost non-oil-resistant material, good water resistance, good elasticity below 70 hardness, poor compressibility at high hardness. Disadvantages: Strong acids, ozone, oils, oil esters and fats and most hydrocarbons are not recommended. Widely used in tire industry, shoe industry, cloth industry and conveyor belt industry.

Butyl rubber IIR

(Butyl Rubber) is made by the polymerization of isobutylene and a small amount of isoprene. Because the movement of the three-dimensional barrier molecule of methyl group is less than that of other polymers, it has less gas permeability and is more resistant to heat, sunlight and ozone. Good electrical insulation; great resistance to polar agents, the general operating temperature range is minus 54-110 ℃. Advantages: Impermeable to most common gases, good resistance to sunlight and odors, can be exposed to animal or vegetable oils or vaporizable chemicals. Disadvantages: It is not recommended to use with petroleum solvent, glue kerosene and aromatic hydrogen at the same time. It is used for inner tube, leather bag, rubber paste paper, window frame rubber, steam hose, heat-resistant conveyor belt, etc. for automobile tires.

Hydrogenated nitrile rubber HNBR

(Hydrogenate Nitrile) Hydrogenated nitrile rubber is a kind of nitrile rubber that has been hydrogenated to remove part of the double chain. After hydrogenation, its temperature resistance and weather resistance are much higher than that of general nitrile rubber, and its oil resistance is similar to that of general nitrile rubber. The general operating temperature range is minus 25-150 ℃. Advantages: It has better abrasion resistance than nitrile rubber, and has excellent corrosion resistance, tensile strength, tear resistance and compression properties.

It has good resistance under atmospheric conditions such as ozone, and is generally used in laundry or dishwashing detergents. Disadvantages: It is not recommended to be used in the air-conditioning and refrigeration industry in alcohol, ester or aromatic solutions. It is widely used in environmental protection refrigerants, seals in R134a systems, and seals in automotive engine systems.

Ethylene propylene rubber EPDM

Ethylene propylene rubber EPDM (Ethylene propylene Rubber) is made of ethylene and propylene copolymer, so it has excellent heat resistance, aging resistance, ozone resistance and stability, but it cannot be sulfur-added. In order to solve this problem, a small amount of the third component with double chains is introduced into the main chain of EP and sulfur can be added to form EPDM. Generally, the temperature is minus 50-150℃. Excellent resistance to polar solvents such as alcohols and ketones Advantages: good weather resistance and ozone resistance, excellent water resistance and chemical resistance, can use alcohols and ketones, high temperature steam resistance, gas resistance Has good impermeability. Disadvantages: Not recommended for food use or exposure to aromatic hydrogen. Seals for high-temperature water vapor environments Sanitary equipment seals or parts. Rubber parts in braking (brake) systems. Seals in the radiator (car radiator).

Nitrile rubber NBR

(Nitrile Rubber) is copolymerized by acrylonitrile and butadiene. The content of acrylonitrile is 18%-50%. The higher the content of acrylonitrile, the better the resistance to petrochemical hydrocarbon fuel oil, but the low temperature performance will change Poor, the general use temperature range is minus 25-100 ℃. Nitrile rubber is one of the most commonly used rubbers for oil seals and O-rings. It has good properties of oil resistance, water resistance, solvent resistance and high pressure oil resistance.

Has good compressibility, abrasion resistance and elongation.

Disadvantages: Not suitable for use in polar solvents, such as ketones, ozone, nitro hydrocarbons, MEK and chloroform. ? Used to make fuel tanks, lubricating oil tanks and in petroleum-based hydraulic oil, gasoline, water, silicone oil, diester Rubber parts used in fluid media such as lubricating oil, especially sealing parts. Arguably the most versatile and lowest cost rubber seal.

Neoprene CR

(Neoprene, Polychloroprene) is polymerized from chloroprene monomer. The vulcanized rubber has good elasticity and wear resistance, is not afraid of direct sunlight, has particularly good weather resistance, is not afraid of violent distortion, is not afraid of refrigerants, is resistant to dilute acid and silicone ester lubricants, but is not resistant to phosphate ester hydraulic pressure. Oil. It is easy to crystallize and harden at low temperature, and has poor storage stability. It expands greatly in mineral oil with low aniline point. The general operating temperature range is -50~150℃. Advantages: good elasticity and good compression deformation, the formula does not contain sulfur, so it is very easy to make, has the characteristics of resistance to animal and vegetable oils, and will not be affected by neutral chemicals, fats, oils, various oils, and solvents. Affect physical properties, with flame retardant properties.

Disadvantages: It is not recommended to use strong acids, nitro hydrocarbons, esters, chloroform and ketones. R12 refrigerant-resistant seals, rubber parts or seals on household appliances. It is suitable for making all kinds of parts that are in direct contact with the atmosphere, sunlight and ozone. Suitable for all kinds of fire-resistant and chemical-resistant rubber products.

Composition of synthetic rubber: Synthetic rubber is a polymer polymerized from oil and natural gas as raw materials, with dienes and olefins as monomers.

The polymer of rubber has broken through the process of monomer polymerization. Rubber factories have begun to use higher-strength rubber, which is aggregated with ultra-high polymer, and the cost is quite low.