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 reliable, efficient seal at the interface, ensuring strong protection.
The versatile 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 the precise 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 expertly 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 showcases resilience by being 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 diverse range of O-ring materials, each tailored to excel in specific situations.
Styrene-butadiene rubber (SBR)
Materials:
O-ring selection is based on chemical compatibility, application temperature, sealing pressure, lubrication requirements, durometer, size, and cost, ensuring optimal performance across applications.
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 (Neoprene - A versatile synthetic rubber offering excellent resistance to temperature variations and chemical exposure, ideal for numerous industrial applications.Chloroprene Rubber (CR) - Known for its outstanding durability and flexibility, making it perfect for applications requiring reliable performance in challenging environments.
- Polyisoprene - A synthetic version of natural rubber, renowned for its elasticity and resilience, suitable for a vast array of sealing and protective uses. (IR) - A top choice for applications requiring natural rubber-like properties with enhanced consistency and dependability.
- Polysulfide Rubber - Offers exceptional chemical and weather resistance, making it a preferred material for demanding sealing solutions. (PSR) - Designed to excel in environments with potential chemical exposure, providing long-lasting performance and reliability.
- Polytetrafluoroethylene - Known for its non-stick properties and resistance to heat, chemicals, and weather, PTFE is indispensable in high-tech and industrial applications. (PTFE) - The go-to option for applications demanding superior electrical insulation and minimal friction.
- Sanifluor - Engineered for unmatched resistance to chemicals and extreme temperatures, Sanifluor stands out in specialty applications. (FEPM) - A high-performance elastomer for applications requiring exceptional thermal and chemical resistance.
- Silicone Rubber - Offers exceptional flexibility and stability over a wide temperature range, ideal for medical, automotive, and industrial seals. (SiR) - Chosen for its excellent electrical insulation properties and resistance to extreme temperatures, perfect for critical applications.
Nitrile - The ultimate cost-effective rubber O ring material, perfect for seals in pumps and drive belts. NBR excels in hydraulic and pneumatic uses, handling fats, greases, and oils effortlessly. For diesel exposure or temperatures beyond 120°C, consider Polymax FKM (Viton®) for superior 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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