There are many types of rubber seals, such as cyanide rubber, hydrogenated cyanide butadiene rubber, silicone rubber, fluorosilicone rubber, EPDM, neoprene, etc. What are the advantages and applications of different rubber seals?
NBR Butadiene Rubber Sealing Ring
It is suitable for use in petroleum-based hydraulic oil, glycol-based hydraulic oil, diester-based lubricating oil, gasoline, water, silicone grease, silicone oil, and other media. It is currently the most widely used and lower-cost rubber seal. Not suitable for polar solvents, such as ketones, ozone, nitro hydrocarbons, MEK, and chloroform. The general use temperature range is -40~120℃.
HNBR Hydrogenated Butadiene Cyanide Rubber Sealing Ring
It has the characteristics of corrosion resistance, tear-resistance and compression deformation resistance, and good resistance to ozone, sunlight, and weather. It has better abrasion resistance than cyanide rubber. It is suitable for washing machinery, automobile engine system, and refrigeration system using the new environmentally friendly refrigerant R134a. It is not recommended to use in alcohols, esters, or aromatic solutions. The general use temperature range is -40~150℃.
SIL Silicone Rubber Sealing Ring
It has the properties of heat resistance, cold resistance, ozone resistance, and atmospheric aging resistance. Has very good insulation properties. However, the tensile strength is worse than that of general rubber and it has no oil resistance. Suitable for household appliances such as electric water heaters, electric irons, microwave ovens, etc. It is also suitable for all kinds of articles that come into contact with the human body, such as kettles, drinking fountains, etc. It is not recommended to use in most concentrated solvents, oils, concentrated acids, and sodium hydroxide. The general use temperature range is -55~250℃.
FLS fluorosilicone rubber sealing ring
Its performance combines the advantages of fluorine rubber and silicone rubber and has good oil resistance, solvent resistance, fuel oil resistance, and high and low-temperature resistance. It can resist the corrosion of oxygen-containing compounds, aromatic hydrocarbon-containing solvents, and chlorine-containing solvents. Generally used for aviation, aerospace, and military purposes. It is not recommended to expose to ketones and brake fluid. The general use temperature range is -50~200℃.
EPDM EPDM rubber sealing ring
It has good weather resistance, ozone resistance, water resistance, and chemical resistance. It can be used for alcohols and ketones, and can also be used for sealing in a high-temperature water vapor environment. It is suitable for sanitary ware, car radiator, and car brake system. Not recommended for food use or exposure to mineral oil. The general use temperature range is -55~150℃.
CR neoprene sealing ring
It is particularly resistant to sunlight and weather. It is not afraid of refrigerants such as dichlorodifluoromethane and ammonia. It is resistant to dilute acid and silicone grease, but it has a large expansion in mineral oil with a low aniline point. It is easy to crystallize and harden at low temperatures. It is suitable for all kinds of environments exposed to the atmosphere, sunlight, ozone, and various flame-resistant and chemical-resistant sealing links. It is not recommended to use in strong acids, nitro hydrocarbons, esters, chloroform, and ketones. The general use temperature range is -55~120℃.
IIR Butyl Rubber Sealing Ring
Airtightness is particularly good, heat resistance, sunlight resistance, ozone resistance, good insulation performance; good resistance to polar solvents such as alcohols, ketones, esters, etc., and can be exposed to animal and vegetable oils or oxidizable. Suitable for chemical resistant or vacuum equipment. It is not recommended to use it with petroleum solvents, kerosene, or aromatic hydrocarbons. The general use temperature range is -50~110℃.
ACM Acrylic Rubber Sealing Ring
It has good resistance to oil, high-temperature resistance, and weather resistance, but the mechanical strength, compression deformation rate, and water resistance are slightly worse. Generally used in automobile transmission systems and power steering systems. Not suitable for hot water, brake fluid, phosphate ester. The general use temperature range is -25~170℃.
NR natural rubber sealing ring
It has good abrasion resistance, elasticity, tear strength, and elongation. However, it is easy to age in the air, becomes sticky when exposed to heat, easily swells and dissolves in mineral oil or gasoline, and is resistant to alkali but not strong acid. It is suitable for use in liquids containing hydroxide ions such as automobile brake fluid and ethanol. The general use temperature range is -20~100℃.
PU polyurethane rubber sealing ring
Polyurethane rubber has very good mechanical properties, and its wear resistance and high-pressure resistance are far superior to other rubbers. The aging resistance, ozone resistance, and oil resistance are also quite good, but it is easy to be hydrolyzed at high temperatures. Generally used in high pressure and wear-resistant sealing links, such as hydraulic cylinders. The general use temperature range is -45~90℃.
FFKM perfluorinated rubber
Very excellent chemical resistance, resistance to most chemicals such as acids, alkalis, ketones, esters, ethers, and strong oxidants. Higher heat resistance can reach 320°C. It is usually used to solve the sealing problem sexually, and the price is nearly a hundred times that of general rubber materials, which is very expensive.