O-Ring

O-ring, a mechanical gasket, is designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. O-Rings are commonly used to prevent leaks in either fluids or gases from occurring in products, systems, or machinery and find use across a variety of industries.

 

O-Ring Material Selection
 
MATERIAL  Application
Viton® Viton® (fluoroelastomer) is extremely versatile
It can be used in chemical processing, automotive and appliance applications
Nitrile (Buna-N)  Temperature range is between -53°C and 148°C
Nitrile is tear-resistant and able withstand abrasive treatment
It is suitable for use with water, petroleum oils and some hydraulic fluids
Neoprene Temperature range is between -53°C and 148°C
Neoprene is a general purpose elastomer
It has a relatively low compression set with good resilience and abrasion. It is also a flex cracking resistant material
Silicone  Temperature range is between -84°C and 232°C
Silicone performs well with water, steam or petroleum fluids. Occasionally, it is used in high temperature fuel injection ports
Due to its poor tear resistance, abrasion and tensile strength, it is more suitable for static function application
Ethylene Propylene Rubber (EPR)  Temperature range is between -53°C and 148°C
Ethylene Propylene Rubber is suitable for use with corrosive Skydrol hydraulic fluid, as well as steam, water, silicone oils, alcohols and brake fluids
It has good heat and compression resistance although EPR is not perfect for a wide-range of applications due to wear and tear issues
It has been used widely in the aerospace industry in hydraulic pumps
Polyurethane Temperature range is between -53°C and 100°C
Polyurethane is well regarded for its all-round general toughness, together with its notable abrasion and extrusion resistance although it is not be suitable for applications requiring good compression and heat resistance
It is often used for pneumatic tools, hydraulic fittings, cylinders and valves