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Comparison of common rubber properties

Edit: John 2020-01-30 Mobile

Comparison of common rubber properties Tags:Rubber Mixers 

  Rubber is divided into natural rubber and synthetic rubber by raw material

  Natural rubber NR (Natural Rubber) is made of rubber tree latex and is a polymer of isoprene. It has good abrasion resistance, high elasticity, breaking strength and elongation. It is easy to age in the air, become viscous when heated, easily expand and dissolve in mineral oil or gasoline, resistant to alkali but not strong acid. Advantages: good elasticity, acid and alkali resistance. Disadvantages: non-weather and oil-resistant (resistant to vegetable oil) are the raw materials for making tapes, hoses, and rubber shoes, and are suitable for making shock-absorbing parts and products used in hydroxide-containing liquids such as automobile brake oil and ethanol.

  SBR (Styrene Butadiene Copolymer) Copolymer of butadiene and styrene. Compared with natural rubber, it has uniform quality and fewer foreign materials. It has better abrasion resistance and aging resistance. Blended with natural rubber. Advantages: low-cost non-oil-resistant materials, good water resistance, good elasticity below 70, poor compression at high hardness, disadvantages: strong acids, ozone, oils, oil esters and fats are not recommended Part of the hydrocarbons. Widely used in tire industry, shoe industry, cloth industry and conveyor belt industry.

  Butyl rubber IIR (Butyl Rubber) is formed by the polymerization of isobutylene and a small amount of isoprene. Because methyl steric molecules have less movement than other polymers, they have less gas permeability and are less sensitive to heat, sunlight, and ozone. High resistance, good electrical insulation; high resistance to polar capacitors, the general temperature range is -54-110 ℃. Advantages: Impermeability to most general gases, good resistance to sunlight and odor, can be exposed to animal or vegetable oils or gasifiable chemicals. Disadvantages: It is not recommended to use inner tube, leather bag, rubber paste paper, window frame rubber, steam hose, heat-resistant conveyor belt, etc. for car tires with petroleum solvents, kerosene and aromatic hydrogen.

  Hydrogenated Nitrile HNBR (Hydrogenate Nitrile) Hydrogenated nitrile rubber is a nitrile rubber that is partially hydrogenated after hydrogenation. After hydrogenation, its temperature resistance and weather resistance are much higher than ordinary nitrile rubber. Nitrile is similar. The general use temperature range is -25 ~ 150 ℃. Advantages: It has better abrasion resistance than nitrile rubber, and has excellent characteristics of corrosion resistance, tensile resistance, tear resistance and compression. It has good resistance to atmospheric conditions such as ozone, and is generally suitable for washing or dishwashing detergents. Disadvantages: It is not recommended to be used in the air-conditioning and refrigeration industry in alcohols, esters or aromatic solutions. It is widely used as the seal in the environmentally friendly refrigerant R134a system. Automotive engine system seals.

  Ethylene propylene rubber EPDM (Ethylene propylene Rubber) is copolymerized with ethylene and propylene, so it has excellent heat resistance, aging resistance, ozone resistance, and stability, but it cannot be sulfur-sulfurized. To solve this problem, in EP A small amount of double-stranded third component is introduced into the main chain, which can be sulfurized to form EPDM. The general use temperature is -50 ~ 150 ℃. Excellent resistance to polar solvents such as alcohols and ketones. Good advantages: Good weather resistance and ozone resistance, excellent water resistance and chemical resistance. Alcohols and ketones can be used. The gas has good impermeability. Cons: Not recommended for food use or exposure to aromatic hydrogen. Seals or parts of sanitary equipment in high temperature water vapor environment. Rubber parts in a braking (braking) system. Seal in radiator (car water tank).

  Nitrile rubber NBR (Nitrile Rubber) is made by copolymerizing acrylonitrile and butadiene. The acrylonitrile content is from 18% to 50%. The higher the acrylonitrile content, the better the resistance to petrochemical hydrocarbon fuel oil. The low temperature performance becomes worse, and the general use temperature range is -25 ~ 100 ℃. Nitrile rubber is one of the most commonly used rubbers for oil seals and O-rings at present. It has good oil resistance, water resistance, solvent resistance and high pressure oil resistance. With good compressibility, anti-wear and elongation. Disadvantages: Not suitable for use in polar solvents, such as ketones, ozone, nitro hydrocarbons, MEK and chloroform.? For the production of fuel tanks, lubricating oil tanks and in petroleum-based hydraulic oils, gasoline, water, silicone oil, diesters Rubber parts used in fluid media such as lubricants, especially seal parts. It can be said that it is the most widely used and lowest cost rubber seal.

  Neoprene CR (Neoprene, Polychloroprene) is polymerized from chloroprene monomers. Vulcanized rubber has good elasticity and abrasion resistance, is not afraid of direct sunlight, has excellent weather resistance, is not afraid of intense distortion, and is not afraid of refrigerant ,, resistant to dilute acid, silicone oil, but not phosphate oil. It is easy to crystallize and harden at low temperature, poor storage stability, and large expansion in mineral oil with low aniline point. The general 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. It has the characteristics of resistance to animal and vegetable oils, and will not be affected by neutral chemicals, fats, oils, various oils and solvents Physical properties and anti-flammability. Disadvantages: It is not recommended to use strong acid, nitro hydrocarbon, ester, chloroform and ketone chemicals. R12 refrigerant-resistant seals, rubber parts or seals on household appliances. Suitable for making a variety of parts that are in direct contact with the atmosphere, sunlight and ozone. Applicable to all kinds of flame-resistant and chemical-resistant rubber products.

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