An O-ring, also known as a packing or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, forming a seal at the interface.
The O-ring may be used in static applications or in dynamic applications where there is relative motion between the parts and the O-ring. Dynamic examples include rotating pump shafts and hydraulic cylinder pistons. Static applications of O-rings may include fluid or gas sealing applications in which: (1) the O-ring is compressed resulting in zero clearance, (2) the O-ring material is vulcanized solid such that it is impermeable to the fluid or gas, and (3) the O-ring material is resistant to degradation by the fluid or gas.[1] The wide range of potential liquids and gases that need to be sealed has necessitated the development of a wide range of O-ring materials
Styrene-butadiene rubber (SBR)
Materials:
O-ring selection is based on chemical compatibility, application temperature, sealing pressure, lubrication requirements, durometer, size, and cost.
Synthetic rubbers - Thermosets:
- Butadiene rubber (BR)
- Butyl rubber (IIR)
- Chlorosulfonated polyethylene (CSM)
- Epichlorohydrin rubber (ECH, ECO)
- Ethylene propylene diene monomer (EPDM)
- Ethylene propylene rubber (EPR)
- Fluoroelastomer (FKM)
- Nitrile rubber (NBR, HNBR, HSN, Buna-N)
- Perfluoroelastomer (FFKM)
- Polyacrylate rubber (ACM)
- Polychloroprene (Experience the versatility and durability of neoprene, a top choice in the industry.) (CR)
- Discover the resilience and flexibility of Polyisoprene, a dependable solution for diverse applications. (IR)
- Polysulfide rubber offers remarkable resistance to chemicals and environmental factors, making it ideal for specialized uses. (PSR)
- Polytetrafluoroethylene stands out with its exceptional non-stick and heat-resistant properties. (PTFE)
- Sanifluor is engineered to deliver outstanding chemical resistance and reliability in demanding environments. (FEPM)
- Silicone rubber is renowned for its superb temperature resistance and flexibility, perfect for a wide range of applications. (SiR)
Nitrile provides an excellent balance of cost-effectiveness and availability, perfect for seals in pumps, drive belts, and general engineering within the hydraulic and pneumatic sectors. It's particularly effective against fats, greases, and oils. For higher temperature applications or diesel exposure, consider Polymax FKM (Viton®) for enhanced performance.
Colour |
Black |
Material |
Nitrile (NBR) |
Internal Diameter (mm) |
24.99 |
CS value |
3.53 |
Cross Section Type |
Circular |
O-ring type |
British Standard |
Hardness (Shore A) |
70 |
Maximum Temperature (°C) |
90.00 |
Minimum Temperature (°C) |
-30.00 |





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