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O-Rings - NBR Nitrile, 70 Shore A
O-rings are circular sealing rings with a round cross-section. When an O-ring is fitted into a groove and compressed between two surfaces, it forms a seal that prevents the escape of liquids or gases. O-rings are suitable for both static and dynamic applications.
These O-rings are made from NBR (nitrile butadiene rubber), which has excellent resistance to mineral oils, hydraulic fluids and greases, along with good mechanical strength and wear resistance. At 70 Shore A, the material offers a good balance of flexibility and durability, making it the standard choice for general-purpose sealing.
Chemical Compatibility
NBR is recommended for use with mineral oils and greases, hydraulic oils, diesel and fuel oils, aliphatic hydrocarbons (such as propane and butane), vegetable oils, silicone greases and water-based hydraulic fluids (HFA, HFB and HFC). Dilute acids and alkaline or saline solutions are generally acceptable at moderate temperatures.
Limitations
NBR is not recommended for use with aromatic hydrocarbons, chlorinated hydrocarbons, ketones (such as acetone), esters, strong acids, glycol-based brake fluids, phosphate-ester hydraulic fluids or methanol. Petrol with a high aromatic or ethanol content may require a specialist grade. NBR has limited resistance to ozone, sunlight and weathering, so it should not be used where it will be exposed outdoors for long periods.
Applications
These O-rings are suitable for hydraulic and pneumatic cylinders, valves, pumps, fuel and lubrication systems, and general industrial machinery.
Installation Guidance
Make sure that the groove and mating surfaces are clean and free from burrs. The 70 Shore A compound is flexible enough to fit easily and to seal well against a range of surface finishes. For high-pressure applications or larger clearance gaps, a harder grade or back-up rings may be required to prevent extrusion. Apply a thin film of compatible lubricant before fitting, and do not stretch or roll the O-ring over sharp edges or threads.
All dimensions are nominal. The information provided by AH Design Components Ltd is for reference only and is not a manufacturing specification. Please confirm that the product is suitable for your application before use.
