The advantages and disadvantages of the classification of rubber seals
and the use of nitrile rubber NBR It is made of acrylonitrile and butadiene copolymerized, and the acrylonitrile content of the sealing ring is 18%~50%. The resistance of fuel oil is better, but the low temperature performance is worse. The general operating temperature range is -25~100℃. Nitrile rubber is one of the most commonly used rubbers for oil seals and O ring manufactures. It has good oil resistance, water resistance, solvent resistance and high pressure oil resistance. It has good compressibility, wear resistance and elongation force sealing ring. Disadvantages: Not suitable for sealing rings 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, two parts used in fluid media such as ester lubricating oils, especially sealing parts. It can be said to be the most widely used and lowest cost rubber seals. Natural rubber NR is made of latex collected from rubber trees and is a polymer of isoprene .It 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: It is not weather-resistant and oil-resistant. It is the raw material for making tapes, hoses and rubber shoes, and is suitable for making shock-absorbing parts and products used in automobile brake fluid, ethanol and other liquids with hydroxide radicals. Butyl rubber IIR is made by polymerizing 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 has high resistance to heat, sunlight and ozone. Good insulation; great resistance to polar solvents, the general operating temperature range is -54-110 ℃. Advantages: impermeability to most common gases, good resistance to sunlight and odors, and can be exposed to animals or vegetable oils or gaseous chemicals. Disadvantages: It is not recommended to use petroleum solvents, kerosene and aromatic hydrogen at the same time as inner tubes, leather bags, rubber plaster papers, window frame rubbers, steam hoses, heat-resistant conveyor belts, etc. for automobile tires. Hydrogenated nitrile rubber HNBR Hydrogenated nitrile rubber is a 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 -25~150℃. Advantages: better abrasion resistance than nitrile rubber, excellent corrosion resistance, tensile strength, tear resistance and compression properties, good resistance under atmospheric conditions such as ozone, generally suitable for laundry or dishwashing in the cleaning agent. 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 seals in environmental protection refrigerant R134a systems and automotive engine system seals. SBR is a copolymer of butadiene and styrene. Compared with natural rubber, it has uniform quality, less foreign matter, better wear resistance and aging resistance, but weaker mechanical strength. It can be blended with natural rubber. use. Advantages: low-cost non-oil-repellent material, good water resistance, good elasticity below 70 hardness, poor compressibility at high hardness, disadvantages: strong acid, ozone, oil, grease and fat are not recommended. some of the hydrocarbons. Widely used in tire industry, shoe industry, cloth industry and conveyor belt industry. Ethylene propylene rubber EPDM is made of ethylene and propylene copolymer, so it has excellent heat resistance, aging resistance, ozone resistance and stability, but it cannot be sulfurized. To solve this problem, a small amount of EP is introduced into the main chain. It has the third component of double chain and can be vulcanized to become EPDM. The general operating temperature is -50~150℃. It has excellent resistance to polar solvents such as alcohol and ketone. Advantages: good weather resistance and ozone resistance, With excellent water resistance and chemical resistance, alcohol and ketones can be used, high temperature steam resistance, and good impermeability to gas. Disadvantages: Not recommended for food use or exposure to aromatic hydrogen. Seals for high-temperature water vapor environments Sanitary equipment seals or parts. parts in the braking system. Seals in radiators. Neoprene CR 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, and is resistant to dilute acid. , Silicone ester lubricating oil, but not phosphate ester hydraulic 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. ℃. 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, solvents However, it affects physical properties and has flame-retardant properties. Disadvantages: It is not recommended to use seals resistant to R12 refrigerant among chemicals such as strong acids, nitro hydrocarbons, esters, chloroform and ketones. parts or seals on home 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. Company website: https://www.orksealing.com/
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