•NBR rubber seals with compression rate controlled within 25%, featuring oil and pressure resistance for machinery hydraulic systems.
•Manufactured to AS568 standard, Shore A hardness 75 with tolerance ±5.
•NBR O-rings operate reliably at temperatures ranging from -40℃ to 120℃.
•Reliable sealing performance under oily and pressurized working conditions.
NBR Rubber O-Rings are made of nitrile rubber (NBR) material with a black appearance. With a temperature range covering -40°C to 120°C, they offer both oil resistance and water resistance, maintaining reliable sealing performance in oil and water media. These O-shaped rubber sealing rings are commonly used in automotive and pipeline equipment.
The NBR-O rubber O-ring features a compression rate of approximately 20%, a fill rate of about 75%, and a tolerance of ±5. After assembly, it provides uniform stress distribution and durable sealing performance without easy permanent deformation. Backed by mature formulations and processes, these nitrile rubber sealing rings are cost-effective and offer excellent value for money, making them suitable for bulk applications.
With the advantages of oil resistance, water resistance, and wide temperature adaptability, this black O-ring rubber seal is widely used, mainly for sealing positions in automotive engines, fuel systems, and various pipeline equipment. It is an economical and practical O-ring sealing solution for the automotive and pipeline industries.
| Item | Specification |
|---|---|
| Full Material Name | Nitrile Butadiene Rubber (Butadiene-Acrylonitrile Copolymer) |
| Abbreviation | NBR |
| Hardness (Shore A) | 40A–90A |
| Common Hardness in Market | 60A, 70A, 80A (70A widely used for construction machinery) |
| Continuous Operating Temperature | -30℃ ~ +120℃ |
| Short-term Peak Temperature | +135℃ |
| Compression Set (100℃ × 72h) | ≤25% |
| Tensile Strength | ≥12 MPa |
| Elongation at Break | ≥300% |
| Standards | GB/T3452.1, ISO3601-1, AS568, JIS B2401 |
| Compatible Media | Mineral hydraulic oil, engine oil, diesel oil, grease, water, salt water, ethylene glycol antifreeze, normal compressed air |
| Incompatible Media | Benzene, toluene and other aromatic solvents, ketones, esters, strongly polar solvents, high-temperature steam, concentrated strong acid, long-term ozone exposure |
| Typical Products | Standard O-rings, O-ring kits, oil seals, hydraulic sealing parts, pneumatic sealing rings |
| Application Scenarios | Construction machinery, excavators, heavy trucks, automobiles, general hydraulic & pneumatic equipment |
| Main Features | Cost-effective, excellent oil resistance, good wear resistance and processability; moderate ozone resistance and weather resistance |
| Notes | Avoid high-temperature steam; ozone environment accelerates aging; keep away from strong solvents |
High-performance nitrile rubber (NBR) O-ring seals are suitable for static and low-speed dynamic sealing conditions, with stable and reliable sealing performance.
This product boasts excellent oil resistance, being compatible with mineral-based hydraulic oil, diesel, and various lubricating greases; it also has good water resistance, suitable for freshwater, salt water, and ethylene glycol-based antifreeze solutions and other medium environments; it also exhibits good chemical stability towards mild corrosive media such as weak acids and weak alkalis. Its compression permanent deformation rate is low and its resilience is excellent, effectively preventing fluid leakage.
It is widely used in hydraulic systems, automotive components, and industrial machinery and equipment, supporting ISO standard specifications and customer customized requirements.
NBR O-ring provides stable leak-proof sealing for static and dynamic applications.
NBR O-ring resists mild corrosion from weak acid and weak alkali.
NBR O-ring features great oil resistance against mineral oil and grease.
NBR O-ring works reliably in fresh water, salt water and antifreeze.
NBR O-rings, also called nitrile rubber seals, are widely adopted across numerous industrial sectors, including construction machinery, excavators, heavy trucks, automobiles, hydraulic and pneumatic equipment, petroleum, general manufacturing, chemical and power systems.
Jinnai Seal provides customized rubber sealing solutions tailored to diverse industrial needs. Our customization services cover rubber materials, dimensions, shapes and designs, colors, hardness, surface finishes, mold development, and packaging. We support both standard specifications and custom manufacturing based on your drawings, samples, and application requirements, delivering flexible and reliable sealing products for a wide range of industries.
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