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Description
Description O-ring cord is a rubber cord with a circular profile that can be cut to the required length. O-ring cord can be used as a static seal for when standard sizes are either unavailable or too costly. Application None Materials Nitrile Rubber (NBR) + Ethylene Propylene Diene Monomer Rubber (EPDM) + Fluorinated Rubber (FKM) + Silicone Rubber: Methyl Vinyl Polysiloxane (VMQ)

TECHNICAL DATA

Temperature	NBR: -40°C to 120°C FKM: -26°C to 204°C EPDM: -54°C to 150°C Silicon: -65°C to 232°C
Pressure	None 50 MPa
Speed	None 0.5 m/s
Medias	None Mineral hydraulic oils

MATERIALS

NBR

Nitrile rubber (NBR) is the general term for acrylonitrile-butadiene copolymer. The ACN content can vary between 18% and 50%. While the acrylonitrile content is important, the resistance to oil and fuel is more so. Conversely, the elasticity and compression set are not as good. The NBR has good mechanical properties and good wear resistance. However, its resistance to atmospheric agents and the ozone is relatively low.

Chemical resistance	Aliphatic hydrocarbons (propane, butane, petroleum, diesel fuel) Mineral oils and greases Fire-resistant fluids (HFA, HFB and HFC) Diluted acids, low-temperature alkaline and saline solutions Water (up to +100°C max)
Compatibility issue	Fuels with high aromatic content Aromatic hydrocarbons (benzene) Chlorinated hydrocarbons (trichlorethylene) Polar solvents (ketone, acetone, acetic acid, ethylene-ester) Strong acids Glycol-based brake fluids Atmospheric and ozone agents
Temperature range	-25°C/+100°C

FKM

Depending on their structure and fluorine content, the chemical resistance and resistance to the cold in fluororubbers can vary. This FKM-based rubber is very often used for high-temperature hydraulics and pneumatics, for industrial valves, injection/fuel systems, motor seals and high-vacuum systems.

Chemical resistance	Mineral oils and greases, ASTM n°1, IRM 902 and IRM 903 oils. Fire-resistant liquids (HFD) Silicone oils and greases Mineral and vegetable oils and greases Aliphatic hydrocarbons (propane, butane, petroleum) Aromatic hydrocarbons (benzene, toluene) Chlorinated hydrocarbons (trichlorethylene) Fuel (including high alcohol content) Atmospheric and ozone agents
Compatibility issue	Glycol-based brake fluids Ammonia gas Organic acids with a low molecular weight (formic and acetic acids)
Temperature range	-20°C / +200°C (short-term peak at +230°C) -40°C / +200°C with particular FKMs

EPDM

As an Ethylene Propylene Diene Monomer copolymer, EPDM is commonly used for hot water taps, cooling systems, brake systems, dishwashers and washing machines.

Chemical resistance	Hot water and steam up to +150°C Glycol-based brake fluids (Dot 3 & 4) and silicone-based brake fluids (Dot 5) Organic and inorganic acids Cleaning agents, sodium and potassium alkalis Hydraulic fluids (HFD-R) Silicone oils and greases
Compatibility issue	Mineral oils and greases Hydrocarbons Low impermeability to gas
Temperature range	-45°C / +150°C (short-term peak at +175°C)

VMQ

This FVMQ-based rubber is very often used in fuel systems.

Chemical resistance	Animal and vegetable oils and greases. Water for operation at an average temperature. Diluted saline solutions. Atmospheric and ozone agents.
Compatibility issue	Superheated steam up to +120°C. Chlorinated hydrocarbons with a low molecular weight (trichlorethylene) Aromatic hydrocarbons (benzene, toluene)
Temperature range	-60¬°C / +200°C (short-term peak at +230°C)

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