NBR NB70BK91 O-Ring, Size: -008
Material: NBR NB70BK91 O-Ring
Size: AS568 -008 O-Ring
Part Number: NB70BK91-OR-008
NB70BK91
NBR (Nitrile, Buna-N)
70
Shore A
High Temperature Material
Low Temperature Material
Sulfur Cured
Color: Black
Detailed Description
NB70BK91-OR-008 is a Black, 70 Shore A, Sulfur Cured NBR (Nitrile, Buna-N) O-Ring. NB70BK91 is manufactured with the following features & specifications: High Temperature Material, Low Temperature Material. NB70BK91-OR-008 is AS568 size -008 O-Ring also referred to as 1.78mm (Cross Sectional Diameter (CS)) x 4.47mm (Inside Diameter (ID)).
Material: NBR NB70BK91 O-Ring
Size: AS568 -008, 1.78mm CS X 4.47mm ID (0.070" CS X 0.176" ID)
| Technical Specification | Value |
|---|---|
| Compound Number | NB70BK91 |
| Material | NBR (Nitrile, Buna-N) |
| Cure | Sulfur Cured |
| Color | Black |
| Durometer | 70 Shore A |
| High Temperature | 135 °C / 275 °F |
| Low Temperature | -55 °C / -67 °F |
| Geometry Specifications | |
| Cross Sectional Geometry | O-Ring |
| Size Standard | AS568 |
| Size | -008 |
| Cross Section (CS) | 1.78 mm / 0.070 in |
| Inside Diameter (ID) | 4.47 mm / 0.176 in |
NB70BK91 is Canyon’s extreme temperature, 70 Shore A black nitrile rubber (NBR) compound engineered for O-rings and gaskets that must perform reliably across both low and elevated temperature conditions. This material delivers improved flexibility in cold environments while maintaining mechanical stability and low compression set at higher temperatures, making it suitable for demanding industrial sealing applications. With a service temperature range of -54°C to 135°C (-65°F to 275°F), NB70BK91 offers dependable sealing in petroleum-based oils and common industrial fluids where standard nitrile grades may fall short. Its balanced abrasion resistance and cost-effective formulation support long service life in static and light dynamic applications. Compare NB70BK91 to Parker M83461, N0794-75, N0674-70, N1470-70, and NA151-70 for similar extreme-temperature nitrile performance.
NB70BK91 meets ASTM D2000 M2BF714 requirements and is commonly used in pumps, valves, hydraulic components, and general machinery exposed to wide temperature swings. This compound is selected when designers need a single nitrile material to cover broader thermal ranges without moving to higher-cost specialty elastomers. Canyon Components offers NB70BK91 as a practical solution for extreme-temperature NBR O-rings and gaskets requiring durability, consistency, and value.
Common relevant keywords:
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