Back up O'ring 114 NBR 90A
Product: Back-Up O-Ring
Material: NBR (Nitrile Butadiene Rubber)
Hardness: 90A
Description
Back-up O-rings are designed to support primary O-rings in high-pressure or extrusion-prone sealing applications. Positioned behind the main O-ring in a gland, they prevent the primary seal from being forced into gaps or extrusion gaps under pressure.
NBR (nitrile) offers good resistance to mineral oils, fuels, hydraulic fluids, and general-purpose industrial lubricants. Its properties make it suitable for hydraulic and pneumatic systems where oil-compatible elastomers are required.
Hardness 90A provides a firmer backing element that resists extrusion while maintaining adequate conformity for sealing support.
Key Features
Material: NBR (suitable for oil and fuel environments)
Shore Hardness: 90A (firm for effective anti-extrusion support)
Function: Prevents extrusion of primary O-rings; improves pressure capability and seal life
Typical Use: Hydraulic cylinders, high-pressure seals, valve stems, piston and rod assemblies
Temperature Range (typical for NBR 90A): approximately -25°C to +100°C (-13°F to +212°F). Exact range depends on compound formulation.
Chemical Resistance: Good to petroleum-based fluids; limited resistance to strong acids, ketones, and some chlorinated hydrocarbons
Installation: Install behind primary O-ring in the gland; ensure correct groove dimensions to avoid overstressing either element
Sizing and Selection Guidance
Select back-up O-ring ID/OD to fit gland design and match the primary O-ring cross-section and dimension. Common cross-sections: square, rectangular, or custom profiles—verify compatibility with your primary seal.
Hardness 90A is typically chosen where higher compressive strength and extrusion resistance are required. For dynamic seals or softer mating surfaces, consider potential wear—verify with application testing.
Confirm operating temperature, fluid compatibility, and gland tolerance. For extreme temperatures or aggressive chemicals, consider alternative elastomers (e.g., FKM, EPDM, PTFE).
Quality and Standards
Typically manufactured to industry tolerances for sealing elements; specify required standards or certifications if needed for critical systems.
Recommend inspection of part dimensions and material certificates for bulk orders.
Ordering
Provide required dimensions (ID, cross-section/thickness), quantity, and any special compound requirements.
For volume or custom-size requests, contact supplier with application details (pressure, fluid, temperature, dynamic/static application) to confirm material suitability and recommend groove design.
Univergo can supply NBR 90A back-up O-rings in standard and custom sizes for industrial and hydraulic applications. Contact us with dimensions and application parameters for a quote.
Back up O'ring 114 NBR 90A
Product: Back-Up O-Ring
Material: NBR (Nitrile Butadiene Rubber)
Hardness: 90A
Description
Back-up O-rings are designed to support primary O-rings in high-pressure or extrusion-prone sealing applications. Positioned behind the main O-ring in a gland, they prevent the primary seal from being forced into gaps or extrusion gaps under pressure.
NBR (nitrile) offers good resistance to mineral oils, fuels, hydraulic fluids, and general-purpose industrial lubricants. Its properties make it suitable for hydraulic and pneumatic systems where oil-compatible elastomers are required.
Hardness 90A provides a firmer backing element that resists extrusion while maintaining adequate conformity for sealing support.
Key Features
Material: NBR (suitable for oil and fuel environments)
Shore Hardness: 90A (firm for effective anti-extrusion support)
Function: Prevents extrusion of primary O-rings; improves pressure capability and seal life
Typical Use: Hydraulic cylinders, high-pressure seals, valve stems, piston and rod assemblies
Temperature Range (typical for NBR 90A): approximately -25°C to +100°C (-13°F to +212°F). Exact range depends on compound formulation.
Chemical Resistance: Good to petroleum-based fluids; limited resistance to strong acids, ketones, and some chlorinated hydrocarbons
Installation: Install behind primary O-ring in the gland; ensure correct groove dimensions to avoid overstressing either element
Sizing and Selection Guidance
Select back-up O-ring ID/OD to fit gland design and match the primary O-ring cross-section and dimension. Common cross-sections: square, rectangular, or custom profiles—verify compatibility with your primary seal.
Hardness 90A is typically chosen where higher compressive strength and extrusion resistance are required. For dynamic seals or softer mating surfaces, consider potential wear—verify with application testing.
Confirm operating temperature, fluid compatibility, and gland tolerance. For extreme temperatures or aggressive chemicals, consider alternative elastomers (e.g., FKM, EPDM, PTFE).
Quality and Standards
Typically manufactured to industry tolerances for sealing elements; specify required standards or certifications if needed for critical systems.
Recommend inspection of part dimensions and material certificates for bulk orders.
Ordering
Provide required dimensions (ID, cross-section/thickness), quantity, and any special compound requirements.
For volume or custom-size requests, contact supplier with application details (pressure, fluid, temperature, dynamic/static application) to confirm material suitability and recommend groove design.
Univergo can supply NBR 90A back-up O-rings in standard and custom sizes for industrial and hydraulic applications. Contact us with dimensions and application parameters for a quote.
Back up O'ring 114 NBR 90A