Need more? Manufactured within Fifteen working days from order.
Buy More And Save With Our Quantity Discounts · Buy More And Save With Our Quantity Discounts
O-Rings - HNBR, Black, 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 HNBR (hydrogenated nitrile butadiene rubber), which is produced by the hydrogenation of nitrile rubber. This process gives HNBR higher heat resistance and better resistance to ozone and ageing than standard NBR, while retaining its resistance to oils and fuels. HNBR also has high mechanical strength and abrasion 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
HNBR is recommended for use with petroleum oils and greases, hydraulic oils, aliphatic hydrocarbons, vegetable and animal oils and fats, silicone greases, water-based hydraulic fluids (HFA, HFB and HFC), water and hydrogen sulphide (H₂S). Dilute acids, alkalis and saline solutions are generally acceptable at moderate temperatures.
Limitations
HNBR is not recommended for use with aromatic hydrocarbons, chlorinated hydrocarbons, ketones (such as acetone), esters, ethers, strong acids, glycol-based brake fluids or fuels with a high aromatic content.
Applications
These O-rings are suitable for hydraulic systems, oil and gas equipment, automotive fuel 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.
