O-Ring Rubber Material Properties
Rubber Material Properties
CR (Chloroprene Rubber)
Chloroprene is the first synthetic rubber, with ozone resistance, chemical resistance, aging resistance, low compression set. CR is used in variable transportation field such as automotive, railroad. It has superior resistance to ammonia, freon, acid base, flame, weather, ozone, sunlight, oxygen.
CR Service Temperatures
From -40 °C to +100 °C
Chemical Resistance
- Mineral oil(eg.ASTM oil No.1)
- Silicone oil and grease
- Water and water solvent at low temperature
- Refrigerants
- Ammonia(NH3)
- Carbon dioxide(CO2)
- Improved ozone resistance, weather resistance, aging resistance compared with NBR
Not Compatible With
- Aromatic hydrocarbons
- Chlorinated hydrocarbons
- Polar solvents : ketone, acetone, ether, ester
- Mineral oils : ASTM oil No.2 and No.3
- Aliphatic Hydrocarbons : propane, butane, fuel
NBR (Acrylonitrile-Butadiene Rubber)
Nitrile butadiene rubber (NBR) is its physical and chemical properties vary depending on the polymer’s composition of nitrile, this form of synthetic rubber is generally resistant to oil, fuel, and other chemicals
NBR has higher mechanical property and abrasion resistance than other elastomer.
NBR have lower weather resistance and ozone resistance.
It is used in wide spread fields such as hydraulic machines, automotive, ships, Aeronautical fuel system, construction equipments. It has superior resistance to hydraulic oil, water, alcohol, silicone, grease, hydrocarbon fuel,
NBR Service Temperatures
from -40 °C to +100 °C
Chemical Resistance
- Aliphatic Hydrocarbons : propane, butane, petroleum oil, vegetable oils, mineral
oil and greases, diesel fuel.
- HFA, HFB, HFC
- Diluted base, acid, alkali in low temperature
- Superior water resistance(up to 100 °C)
Not Compatible With
- Aromatic Hydrocarbons
- Fuel incl. aromatic hydrocarbons
- Chlorinated hydrocarbons as trichloroethylene
- Polar Solvents : ketone, acetone, acetic acid, ethylene ester
- Strong Acids
- Brake Fluids with glycol base
- Ozone, weather and atmospheric aging
HNBR (Hydrogenated Nitrile Rubber)
A hydrogenated version of nitrile rubber, HNBR, also known as HSN (highly saturated nitrile) is commonly used to manufacture o-rings for automotive air-conditioning systems. It has superior mechanical property and strength.
HNBR exhibits satisfactory compatibility with automotive fuel system, hydrocarbon, diesel fuel, refrigerants R-11, R-12, R-134a, antioxidants, hydraulic oil, oil additive, ozone, diluted base and acid.
It has good tensile strength.
HNBR Service Temperatures
from -40 °C to +150 °C
Chemical Resistance
- Aliphatic hydrocarbons : propane, butane, petroleum oil, vegetable oils, mineral oils and greases,
diesel fuel
- HFA, HFB, HFC fluids
- Hot water and steam up to 149 °C
- Diluted base, acid, alkali in low temperature
- Superior weather resistance and ozone resistance
-
Not Compatible With
- Trichloroethylene, chlorinated hydrocarbons
- Polar solvents : ketone ester
- Strong Acids
EPDM, EPM (Ethylene Propylene Diene Monomer Rubber)
Ethylene propylene diene monomer rubber (EPDM) is a terpolymer of ethylene, propylene and a diene-component. EPDM is good at sealing for hydraulic oil of phosphate ester and brake system using fuel incl. glycol. EPDM exhibits satisfactory compatibility with steam, hot water, ozone, sun light, hydraulic oil, automotive brake/cooling system, acetone, ketone, polar solvents as MEK, silicone oil/grease, diluted acid Alkali, brake oil. It has good tensile strength, compression set.
EPDM Service Temperatures
from -50 °C to +125 °C
Chemical Resistance
- Hot water and steam up to 149 °C
- Brake fluids with glycol base
- Organic and inorganic acids
- Cleaning agent, soda and potassium alkalis
- Hydraulic fluids based on phosphate ester(HFD-R)
- Silicone oil and grease
Not Compatible With
- Mineral oil products : oil, greases, fuels
- Gasoline, kerosene
- Aromatic and Aliphatic hydrocarbons
- Halogenated solvents
- Concentrated acid
SILICONE (VMQ, PVMQ)
Silicone rubber has inferior abrasion resistance, tensile strength, internal tearing strength compared with other rubbers. Whereas has superior weather resistance, ozone resistance, insulation, heat resistance, low temperature strength with physiologically neutral properties.
VMQ Service Temperatures
From -60 °C to +220 °C
Chemical Resistance
- Engine and transmission oil(ASTM oil No.1)
- Vegetable and animal oil and grease
- Brake oil(non-petroleum base)
- Fire-resistant hydraulic fluid : HFD-R, HFD-S
- Chlorinated aromatic hydrocarbon incl. flame resistance, refrigerants for transformer
- Water up to +100 °C
- Diluted salt solutions
- Superior ozone resistance, weather resistance, aging resistance
Not Compatible With
- Steam more than 120°C
- Acids and alkalis
- Chlorinated hydrocarbon : trichlorethylene
- Mineral oil
- Aliphatic hydrocarbons : propane, butane, fuel
- Hydrocarbon based fuel
- Aromatic hydrocarbons
Fluorosilicone (FVMQ)
FVMQ has inferior abrasion resistance, tensile strength, internal tearing strength compared with other rubbers. Whereas has superior weather resistance, ozone resistance, insulation, heat resistance, low temperature strength with physiologically neutral properties. FVMQ offers improved fuel and mineral oil resistance, but poorer hot air resistance than standard VMQ
FVMQ Service Temperatures
From -60 °C to +175 °C
Chemical Resistance
- Engine and transmission oil(ASTM oil No.1)
- Vegetable and animal oil and grease
- Brake oil(non-petroleum base)
- Fire-resistant hydraulic fluid : HFD-R, HFD-S
- Chlorinated aromatic hydrocarbon incl. flame resistance, refrigerants for transformer
- Water up to +100 °C
- Diluted salt solutions
- Superior ozone resistance, weather resistance, aging resistance
Not Compatible With
- Steam more than 120°C
- Acids and alkalis
- Chlorinated hydrocarbon : trichlorethylene
- Mineral oil
- Aliphatic hydrocarbons : propane, butane, fuel
- Hydrocarbon based fuel
- Aromatic hydrocarbons
Fluoro Rubber (FKM, FPM, Viton)
FKM (FPM by Din/ISO 1629) is the designation for about 80% of fluoroelastomers as defined in ASTM D1418. Other fluorinated elastomers are perfluoro-elastomers (FFKM). Fluoroelastomers are more expensive than neoprene or nitrile rubber elastomers partly because they provide additional heat and chemical resistance. FKMs can be divided into different classes on the basis of either their chemical composition, their fluorine content or their crosslinking mechanism.
Chemical Name
-Fluoroelastomer, Fluorinated Rubber, Fluorocarbon Rubber, Fluorine Rubber.
-
Brand Name
- Viton(DuPont-Dow Elastomer), Fluorel(3M), Dyneon(Dyneon Co.), Tecnoflon(Ausimont Corp.)
FKM Service Temperatures
- From -25 °C to +250 °C
- Caution by varying duty more than 200 °C
- Minimum usable temperature varied by Vitons .
Chemical Characteristics
- Second superior chemical resistance and heat resistance to Perfluoroelastomer in commercialized
brands.
- Superior resistance to oil, fuel, lubricant, aliphatic, aromatic hydrocarbons, hydrocarbons.
Not Compatible With
- Oxygenated solvents, ester, ether, ketone, some amine, chlorosulfonic-acid.
Perfluoroelastomer (FFKM, FFPM, KALEZ, PERLAST)
Perfluorelastomers (FFKM) have a fully fluorinated polymer backbone resulting in fluorine content of over 71%. As all of the bonds on the backbone are carbon-fluorine then FFKM materials offer the ultimate thermo-chemical resistance shown by the good long-term high temperature compression-set resistance. This is demonstrated by the good longterm, high-temperature, compressionset resistance.
Chemical resistance is second to none, with good performance in a broad variety of harsh environments:hot amines, steam, solvents, hydrocarbons etc. Traditionally, FFKM polymers have offered limited resistance to low temperatures, however, new polymer chemistry now offers FFKM grades capable of sealing at temperatures down to -40°C.
