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1.NBR 90 Shore A O-Ring Performance Specifications
NBR 90 durometer is a harder nitrile compound specifically formulated for high-pressure applications where standard 70 durometer material would be prone to extrusion.The higher hardness provides superior resistance to extrusion and abrasion,preventing the seal from being forced into clearance gaps under extreme pressure,which can cause nibbling or tearing.90 durometer nitrile offers the maximum extrusion resistance possible from nitrile compounds while retaining excellent compatibility with mineral-based hydraulic oils, petroleum fluids,and greases.Standard operating temperature range for NBR 90 is typically-40℃ to+110℃(-40°F to 230°F),with good performance in water,dilute acids, and aliphatic hydrocarbons.The increased hardness improves mechanical strength and reduces the risk of seal failure in dynamic high-pressure environments.
2.Injection Molding,Extruders,and Blow Molders Working Conditions
Heavy-duty plastic processing equipment such as injection molding machines,extruders, and blow molding machines operates under high hydraulic and pneumatic pressures,often exceeding 200 bar in clamping units and hydraulic manifolds.These systems experience rapid pressure spikes,intense friction,and elevated temperatures from continuous cycles. Standard softer seals frequently fail due to extrusion,abrasion,or leakage in control valves, cylinders,and manifold blocks.NBR 90 durometer seals are widely specified in these applications to maintain volumetric efficiency,prevent oil leaks,and withstand the aggressive mechanical stress in hydraulic circuits.In injection molding and extrusion equipment,high-pressure nitrile seals ensure reliable performance in valves,actuators,and pressure sensors,protecting against downtime caused by seal degradation.
3.AS-009 Size Chart &Dimensions for Pressure Systems
The AS-009 o ring is a small but critical size commonly used in hydraulic valve assemblies, pressure sensors,and compact manifold blocks.
|
AS568 Dash No. |
Inside Diameter (ID) |
Cross Section (CS) |
Material |
Hardness |
|
AS-008 |
0.176 in (4.47 mm) |
0.070 in (1.78 mm) |
NBR (Buna-N) |
90 Shore A |
|
AS-009 |
0.208 in (5.28 mm) |
0.070 in (1.78 mm) |
NBR (Buna-N) |
90 Shore A |
|
AS-010 |
0.239 in (6.07 mm) |
0.070 in (1.78 mm) |
NBR (Buna-N) |
90 Shore A |
Conclusion
For the demanding high-pressure environments of injection molding machines,extruders, and blow molders,NBR 90 durometer o-rings provide the best protection against extrusion and pressure-related failures.The AS-009 size delivers a precise,compact sealing solution for critical valve and sensor components.Always confirm the 90 durometer rating to
ensure the seals can handle the extrusion risks and pressure spikes typical in plastic processing equipment.
