Material Description
Advantages and Disadvantages
Frequent Uses
Nitrile Rubber
NBR
(Nitrile Rubber)
By the polymerization of acrylonitrile and butadiene***, the acrylonitrile content is from 18% to 50%, the higher the acrylonitrile content, the better the resistance to petrochemical oils. The higher the acrylonitrile content, the better the resistance to petrochemical oils and hydrocarbon fuel oils, but the low-temperature performance deteriorates, 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.
Advantages:
? Good resistance to oil, water, solvent and high pressure oil.
? Good compression set, abrasion resistance and elongation.
Disadvantages:
? Not suitable for use in polar solvents such as ketones, ozone, nitro hydrocarbons, MEK and chloroform.
It is used in fuel tanks, lubricant tanks, and rubber parts, especially seals, used in fluid media such as petroleum-based hydraulic fluids, gasoline, water, silicone grease, silicone oil, diester-based lubricants, and glycol-based hydraulic fluids. Can be said to be the most widely used, the lowest cost of rubber seals.Hydrogenated Nitrile Rubber
HNBR
(Hydrogenate Nitrile)
Hydrogenated Nitrile Rubber is a nitrile rubber that is hydrogenated to remove part of the double chain, and after hydrogenation, it has a much higher resistance to temperature and weathering than the general nitrile rubber, and its resistance to oil is similar to that of the general Nitrile rubber. The temperature range of general use is -25~150 ℃.
Advantages:
? Better abrasion resistance than NBR
? Excellent corrosion, tension, tear and compression resistance
? Good resistance to ozone, sunlight and other atmospheric conditions
? Generally suitable for use in laundry or dishwashing detergents
Disadvantages:
? Not recommended for use in alcohols, esters or aromatic solutions.
In the air conditioning and refrigeration industry, it is widely used as a seal in R134a systems, an environmentally friendly refrigerant.? Seals for automotive engine systems.
Ethylene propylene rubber
EPDM
(Ethylene propylene Rubber)
By the polymerization of ethylene and propylene*** into the main chain is not a double chain, so heat resistance, aging resistance, ozone resistance, and stability is very good, but can not sulfur plus sulfur. In order to solve this problem, a small amount of the third component with a double chain is introduced into the main chain of EP, which can be sulfurized to form EPDM, and the general operating temperature range is -50~150 ℃. It has excellent resistance to polar solvents such as alcohols, ketones, ethylene glycol and phosphate ester hydraulic fluids.
Advantages:
? Excellent weather and ozone resistance
? Excellent water and chemical resistance
? Works with alcohols and ketones
? Resistant to high temperature vapors, good impermeability to gases
Disadvantages:
? Not recommended for food use or exposure to aromatic hydrocarbons.
Seals for high temperature water vapor environments.?
Seals for bathroom fixtures or parts.
? Rubber parts in braking systems.
? Seals in radiators ( automotive water tanks ).
Silicone Rubber
SI
(Silicone Rubber)
Silicone Rubber is made by combining silicon (-si-o-si) in the main chain. It has excellent resistance to heat, cold, ozone and atmospheric aging. It has very good electrical insulation properties. The tensile strength is poorer than general rubber and does not have oil resistance.
Advantages:
? Tensile strength up to 1500PSI and tear resistance up to 88LBS
? Good elasticity and good compression set
? Good resistance to neutral solvents
? Excellent resistance to heat
? Excellent resistance to cold
? Excellent resistance to ozone and oxide attack
? Excellent electrical insulation
? Excellent thermal insulation and heat dissipation
Disadvantages:
? Not recommended for use in most concentrated solvents, oils, concentrated acids and diluted sodium hydroxide.
Seals or rubber parts used in the household appliance industry, such as those inside electric kettles, irons, and microwave ovens.? Seals or rubber parts used in the electronics industry, such as cell phone buttons, shock pads in DVDs, seals in cable connectors, etc.
?
? Seals on various items that come into contact with the human body, such as kettles and water dispensers.
Fluoro Rubber
FPM
(Fluoro Carbon Rubber)
Rubber containing fluorine in the molecule, there are various types according to the fluorine content (i.e., monomer structure). Currently widely used hexafluorinated fluoroelastomers were first marketed under the trade name "Viton" by DuPont. High temperature resistance is better than silicone rubber, excellent chemical resistance, resistance to most oils and solvents (except ketones and esters), weather resistance and ozone resistance; cold resistance is worse, the general use of temperature range of -20 ~ 250 ℃. Special formulations can withstand temperatures as low as -40℃.
Advantages:
? Resistant to heat up to 250 °C
? Resistant to most oils and solvents, especially all acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oils
Disadvantages:
? Not recommended for ketones, low molecular weight esters and mixtures containing nitrates.
Automobiles, locomotives, diesel engines and fuel systems.? Seals for chemical plants.
Silicofluoroelastomer
FLS
(Fluorinated Silicone Rubber)
Silicofluoroelastomer is a silicone rubber processed by fluorination, and its general performance has the advantages of both fluorine rubber and silicone rubber; its resistance to oils, solvents, fuel oils and high and low temperatures is good, and the general use of the temperature of -50~200℃. The general operating temperature is -50~200℃.
Advantages:
? Suitable for special applications such as resistance to oxygenated chemicals, aromatic hydrogen solvents and chlorinated solvents.
Disadvantages:
? Exposure to brake fluid, ketones and callous solutions is not recommended
on spacecraft parts.Perfluoroelastomer
FFPM
(Perfluoroelastomer)
Advantages:
? Optimal heat resistance properties
? Excellent chemical resistance
? Low outgassing properties
? Excellent Plasma resistance
Disadvantages:
? Poor low-temperature resistance
? Higher raw material prices
? Higher production difficulty
Perfluorinated products are widely used in the semiconductor industry and information related industries, including PVC, CVD, etching and high vacuum sealing processes in thin film manufacturing.Neoprene
CR
(Neoprene, Polychloroprene)
Created by polymerization of chloroprene monomer. The vulcanized rubber has good elasticity and abrasion resistance, not afraid of direct sunlight, has particularly good resistance to atmospheric aging, not afraid of intense twisting, not afraid of dichlorodifluoromethane and ammonia and other refrigerants, resistant to dilute acid, resistant to silicone ester-based lubricants, but not resistant to phosphate ester-based hydraulic fluids. 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 use temperature range is -50~150 ℃.
Advantages:
? Good elasticity and good compression set.
? Formulated without sulfur and therefore very easy to make
? Resistant to animal and vegetable oils
? The properties are not affected by neutral chemicals, esters, fats, oils, solvents
? Flame retardant properties
Disadvantages:
? Not recommended for use with strong acids, nitro hydrocarbons, esters, chloroform and ketones.
Seals resistant to R12 refrigerant.Seals that are resistant to R12 refrigerant. Rubber parts or seals for household appliances.
? Ideal for parts that come into direct contact with the atmosphere, sunlight and ozone.
? Suitable for a variety of flame-resistant, chemical-resistant rubber products.
Butadiene rubber
S B R
(Styrene Butadiene Copolyme)
Butadiene and styrene **** polymer, compared with natural rubber, quality uniformity, fewer foreign objects, but the mechanical strength is weaker, and can be used in conjunction with natural rubber.
Advantages:
? Low cost non-oil resistant material
? Good water resistance, good elasticity up to hardness 70
? Poor compression set at higher hardnesses
? Can be used with most neutral chemicals, as well as dry, nourishing organic ketones
Disadvantages:
? Not recommended for use with strong acids, ozone, oils, esters and fats and most hydrocarbons.
Widely used in tire industry, shoe industry, ?Widely used in the tire, footwear, cloth and conveyor belt industries, etc.
Butyl Rubber
IIR
(Butyl Rubber)
It is polymerized with a small number of isoprenes and retains a small amount of unsaturated base for sulfurization, due to the three-dimensional obstacles to methyl molecular movement is less than other polymers, so there is less gas permeability, resistance to heat, sunlight, ozone, and good insulation. Good insulation; resistance to polar solvents such as alcohols, ketones, esters, etc., the general use of temperature range of -54 ~ 110 ℃.
Advantages:
? Impermeable to most common gases
? Good resistance to sunlight and ozone
? Can be exposed to animal or vegetable oils or oxidizing chemicals
Disadvantages:
? Not recommended for use with petroleum solvents, kerosene and aromatic hydrocarbons.
Used to make chemical-resistant, vacuum equipment, rubber parts.
Chlorosulfonated Polyethylene Rubber
CSM
(Hypalon , Polyethylene)
Chlorosulfonated polyethylene is a synthetic rubber patented by DuPont. Heat resistance, weather resistance, ozone resistance are good; acid resistance is also good, commonly used in oxidizing drugs (nitric acid, sulfuric acid), the general use of temperature range of -45 ~ 120 ℃.
Advantages:
? Good resistance to ozone, oxidation and flame
? Physical properties similar to neoprene with good acid resistance
? Excellent abrasion resistance
? Low friction surfaces similar to NBR
? Resistance to oils and solvents between Buna-N and Neoprene
? Recommended for use in water to prevent leakage
Disadvantages:
? Exposure to concentrated oxidizing acids, nitro hydrocarbons, esters, ketones and fenugreek hydrogen is not recommended.
Acrylate Rubber
ACM
(Polyacrylate Rubber)
Alkyl Ester Acrylate as the main component of the polymerization of elastomers, petrochemical oils, high temperature resistance, weathering resistance is good, in terms of mechanical strength, compression set and water resistance is weaker than the general oil-resistant rubber. The mechanical strength, compressive deformation rate and water resistance are weaker than the general oil-resistant rubber. The general use temperature range is -25~170 ℃.
Advantages:
? Suitable for use in automotive transmission oils
? Good oxidation and weathering resistance
? Resistant to bending and deformation
? Excellent resistance to oils
? Suitable for use in automotive drivelines and power steering wheels
Disadvantages:
? Not suitable for use in hot water
? Not suitable for use in brake fluid
? No low-temperature resistance
? Not suitable for use in phosphate esters
Automotive driveline and powertrain seals.Natural Rubber
NR
(Natural Rubber)
Made from latex collected from rubber trees, it is a polymer of isoprene. It has good abrasion resistance, high elasticity, tear strength and elongation. It is easy to age in the air, becomes sticky when it is hot, swells and dissolves easily in mineral oil or gasoline, and is resistant to alkali but not to strong acids.
It is the raw material for making tapes, hoses, rubber shoes, and is suitable for making shock absorbing parts, products used in automobile brake fluid, ethanol and other liquids with hydroxide root.Polyurethane Rubber
PU
(Urethane Rubber)
Polyurethane Rubber mechanical properties are quite good, high hardness, high elasticity, abrasion resistance are difficult to compare with other rubbers; aging, ozone and oil resistance is also quite good. General use of temperature range of -45 ~ 90 ℃.
Advantages:
? Wear resistant, high pressure resistant
Disadvantages:
? Not resistant to high temperatures
Industrial high-pressure, wear-resistant seals, such as hydraulic cylinder seals.? High pressure, high charge system
Polytetrafluoroethylene
PTFE
Polytetrafluoroethylene is commonly known as the "king of plastics". It has excellent chemical stability, corrosion resistance, sealing, high lubrication, non-sticky, electrical insulation and good anti-aging resistance. Can be in -180-250 ℃ temperature long-term work
Advantages:
? Resistant to high and low temperatures
? Excellent corrosion resistance and anti-aging properties
? Very high self-lubrication
? Excellent insulating properties
Disadvantages: lack of elasticity
Chemical industry, machinery, electronics, electrical appliances, military industry, aerospace, environmental protection and bridges and other areas of the national economy in the field