O-Ring Type And Material Selection Guide

Type

1.Static O-ring

Used to seal fixed joints, such as pipelines, valves and containers.
Installed between two fixed surfaces to prevent leakage.
The design of the dynamic O-ring is simple and does not require consideration of movement factors.

2.Dynamic O-ring

Used for sealing movable joints such as pistons, hydraulic cylinders and rotating bearings.
Sliding on moving surfaces requires higher sealing performance.
Factors such as surface roughness, lubrication, and contact pressure need to be considered.

3.Rotating O-ring

For sealing of rotating shafts and bearings.
Working on continuously rotating surfaces requires special design and lubrication.
Commonly found in equipment such as pumps, motors and bearings.

4.Reciprocating O-ring

For sealing of reciprocating joints such as pistons and cylinders.
It needs to withstand pressure changes and impacts during back and forth movement.
The material is required to have good elasticity and fatigue resistance.

o-ring-choosing

Material Selection Guide
1.Nitrile rubber (NBR)
High oil resistance, suitable for general industrial applications such as hydraulic systems.
Operating temperature range is -40°C to +100°C.
Has good mechanical strength and wear resistance.

2.Viton (FKM)
Excellent high temperature resistance and chemical resistance, suitable for harsh working environments.
Operating temperature range is -20°C to +200°C.
Widely used in chemical, automotive, aerospace and other industries.

3.Silicone rubber (VMQ)
Good heat resistance and electrical insulation, suitable for food and medical applications.
Operating temperature range is -60°C to +230°C.
Offers excellent weather resistance and softness.

4.Tetrafluoroethylene (PTFE)
Excellent chemical resistance and non-stick, often used in heavy-duty applications.
Operating temperature range is -200°C to +260°C.
Performs well in high temperature and high stress environments.

5.Ethylene propylene rubber (EPDM)
Excellent heat and weather resistance, suitable for high temperature and outdoor applications.
Operating temperature range is -40°C to +150°C.
Has good electrical insulation and chemical stability.

Rubber Type	Main Features Working	Temperature	Main Uses
Nitrile rubber	Oil resistance, heat resistance, wear resistance good. Widely used in making secret Sealed products, but not applicable to Phosphate ester series hydraulic and Polar Additive Gear Oil.	-40～120℃	Used to make "O" rings, Oil seal, suitable for general Hydraulic and pneumatic systems.
Hydrogenated nitrile rubber	High strength, oil-resistant, resistant to Wear-resistant, heat-resistant and aging-resistant.	-40～150℃	Used for high temperature and high speed transportation Re-seal and rotary seal.
fluororubber	"Heat resistance, acid and alkali resistance and other Chemical and oil resistant (including Including phosphate ester series hydraulic oil), suitable for all lubricants Lubricating oil, gasoline, hydraulic oil, synthetic oil"	"-20～200℃	Suitable for sealing high-temperature, chemical, and flame-resistant hydraulic oil in metallurgy and electric power. It is widely used in other industries.
Silicone Rubber	Good heat and cold resistance. press Shrinkage and permanent deformation are small, but machine Low mechanical strength	-60～230℃	Suitable for high and low temperature High-speed rotating seal and food Mechanical seal.
Ethylene propylene rubber	Good weather resistance, in the air Aging resistance and oil resistance in air Average performance, can withstand Freon and a variety of refrigerants.	-50~150℃	Used in refrigerators and refrigeration machines Mechanical seal.
PTFE	Good chemical stability, resistant to Good heat and cold resistance, resistant to Oil, water, steam, medicine, etc. Various media. Mechanical strength High, resistant to high temperature and Grinding, extremely low friction coefficient Good self-lubricating properties.	-55~260℃	Making wear-resistant rings and guides Rings and retaining rings are mechanical Commonly used sealing materials Widely used in metallurgy and petrochemicals Engineering machinery, light industrial machinery Machinery.

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