Custom O-Rings & Cords
Style 8300 - Elastometric Cords
Commonly Ordered Materials
Buna N, Nitrile (NBR)
Most commonly used general purpose o-ring material because of relative low cost, good mechanical properties, and basic resistance to many common lubricants. The acrylonitrile content in NBR varies considerably, and impacts the physical properties of the finished material. The higher the acrylonitrile content, the better the resistance to oil and fuel. At the same time, elasticity and resistance to compression set is adversely affected. In view of these characteristics, a medium acrylonitrile content selected. NBR has good mechanical properties when compared with other elastomers and high wear resistance. NBR is not resistant to weathering and ozone
Vegetable and mineral oils and greases
HFA, HFB and HFC hydraulic fluids
Dilute acids, alkali and salt solutions at low temperatures
Aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oil and grease, diesel fuel, fuel oils)
Ozone, weather and atmospheric aging
Brake fluid with glycol base
Aromatic hydrocarbons (benzene)
Chlorinated hydrocarbons (trichloroethylene)
Polar solvents (ketone, acetone, acetic acid, ethylene-ester)
Fuels of high aromatic content (for fl ex fuels a special compound must be used)
Ethylene Propylene (EPDM)
EPR / EPDM are excellent for sealing phosphate-ester hydraulic fluids and in brake systems that use fluids with a glycol base. EPDM rubber is characterized by wide range of applications and good chemical, heat, and compression resistance. This material is great choice for low torque drive belts
ASTM D2000 M2BA710 A14 B13 C12 G21 F19
Ozone, oxygen, aging and weather resistant
Many organic and inorganic acids
Phosphate-ester based hydraulic fluids
Cleaning agents, sodium and potassium alkalis
Many polar solvents (alcohols, ketones, esters)
Glycol based, and silicone based brake fluids up to 300°F
Hot water and steam up to 149°C (300°F) with special compounds up to 260°C (500°F)
Great for animal and vegetable oils, mild acids, ester based fluids, alcohol
Gasoline, kerosene, aromatic and aliphatic hydrocarbon, halogenated solvents
Concentrated acids, non-polar solvents, petroleum oils and aromatic fuels
Neoprene, Chloroprene
Generally exhibits good resistance to ozone, aging and chemicals. Neoprene rubbers contain Chlorine in the polymer to reduce the reactivity to many oxidizing agents, as well as to oil and flame. This material has good abrasion and tear resistance, and is excellent for use in heating and air conditioning systems (HVAC), refrigeration units and numerous dynamic applications. It has good mechanical properties over a wide temperature range.
ASTM D2000 M3BC710 A14 B14 EO14 EO34
Carbon dioxide, oxygen, ozone, chlorine
Water and water solvents at low temperatures
Paraffin based mineral oil with low DPI (ASTM oil #1)
Refrigerants such as freon gas and ammonia (therefore HVAC applications)
weathering and aging resistance compared with Buna / Nitrile
Chlorinated hydrocarbons such as trichloroethylene
Polar solvents such as ketones, esters, and ethers
Viton®, Fluorocarbon
This material is widely used in chemical, automotive, aerospace and industrial applications. These compounds offer excellent chemical and temperature resistance. Furthermore, Fluorocarbon (FKM) has exhibits very low gas permeability, similar to that of butyl rubber.
ASTM 2000 M4HK710 A1-11 B38 EF31 EO31 EO78 Z1
Non-flammable hydraulic fluids (HFD)
Mineral and vegetable oil and grease
Aromatic hydrocarbons such as benzene, toluene
Gasoline (including high alcohol content)
Very good resistance to ozone, weather and aging
High vacuum, low gas permeability, low compression set
Aliphatic hydrocarbons such as butane, propane, natural gas
Mineral oil and grease (ASTM oil #1, IRM 902, IRM 903 oils)
Chlorinated hydrocarbons such as trichloroethylene and carbon tetrachloride
Glycol based brake fluids
Ammonia gas, amines, alkalis
Superheated steam, hot water
Low molecular weight organic acids (formic and acetic acids)
Silicone
Silicones have good ozone and weather resistance as well as good insulating properties. However, silicone elastomers generally have relatively low tensile strength, poor tear strength , high gas permeability, and poor wear resistance. Therefore, Silicone is not recommended for dynamic applications.
Moderate water resistance
Animal and vegetable oil and grease
Resistance to fungal and biological attack
Excellent resistance to oxygen, ozone, weather elements, sunlight and aging
High molecular weight chlorinated aromatic hydrocarbons (flame-resistant insulators, coolant for transformers)
Hydrocarbon based fuels
Low molecular weight silicone oils
Superheated water steam over 121°C (250°F)
Aromatic hydrocarbons such as benzene, toluene
Concentrated solvents, oils, concentrated acids, diluted sodium hydroxide
Low molecular weight chlorinated hydrocarbons such as trichloroethylene
Not recommended for dynamic applications (poor abrasion resistance and low strength)