Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of hnbr o ring in China. The company has world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale custom made hnbr o ring from our factory.
HNBR O Rings
HNBR O rings provide reliable sealing for applications exposed to heat, oils, fuels, and mechanical wear, depending on compound formulation and operating conditions. Custom sizes, hardness, and tolerances help match sealing grooves, pressure requirements, and equipment specifications.
HNBR O Ring Specifications
|
Parameter |
Specification |
|
Material |
HNBR (Hydrogenated Nitrile Butadiene Rubber) |
|
Hardness |
40–90 Shore A |
|
Operating Temperature |
−40°C to +150°C* |
|
Tensile Strength |
≥15 MPa* |
|
Elongation at Break |
≥250%* |
|
Compression Set |
<35% after 24 h at 125°C* |
|
Heat Aging |
72 h at 150°C* |
|
Inner Diameter (ID) |
1–500 mm* |
|
Outer Diameter (OD) |
1–500 mm* |
|
Cross-Section Diameter (CS) |
1–10 mm* |
*Actual dimensions, material properties, and operating limits depend on the HNBR compound, applicable standards, and application requirements.
Custom HNBR O Ring Manufacturing
We manufacture custom HNBR O rings based on your drawings, samples, sealing groove dimensions, equipment, and operating conditions.
Custom Sizes & Dimensions
We can produce:
- Custom inner diameter (ID), outside diameter (OD), and cross-section diameter (CS)
- Standard and non-standard O ring sizes
- Specified dimensional tolerances
- Dimensions matched to existing sealing grooves and assemblies
HNBR Material & Hardness
HNBR compound and hardness can be selected according to:
- Continuous and peak operating temperatures
- Hydraulic oils, lubricants, fuels, and other contact media
- Operating pressure and extrusion gap
- Hardness and compression requirements
- Static or dynamic sealing conditions
- Wear resistance and expected service life
Drawing / Sample Matching
You can provide:
- CAD drawings or technical specifications
- ID, OD, CS, and dimensional tolerances
- Sealing groove dimensions and mating component details
- Required HNBR grade, hardness, and material properties
- Operating temperature, pressure, and contact media
- Existing O ring samples or part numbers
We use these details to evaluate dimensional compatibility, material suitability, and sealing requirements.
Sealing Design & Performance Requirements
Custom HNBR O rings can be evaluated according to:
- Static, reciprocating, or rotary sealing applications
- Compression and gland design requirements
- Extrusion gap and pressure conditions
- Compression set and thermal aging requirements
- Rapid gas decompression (RGD) resistance, where required
These requirements help identify the appropriate material and design for the intended operating environment.
Mold & Production
Custom molds can be developed for molded HNBR O rings. Available processes may include:
- Compression molding
- Transfer molding
- Injection molding
Samples can be evaluated and approved against agreed specifications before mass production.
OEM Customization
We support project-specific requirements for:
- Dimensions and tolerances
- HNBR compound and hardness
- Application-specific performance requirements
- Packaging and labeling
- Part numbers and product identification
- OEM production using customer-provided molds
For customer-provided molds, mold ownership, authorized use, confidentiality, and intellectual property protection can be defined in the project agreement.
HNBR O Ring Applications
HNBR O rings are used in sealing applications that require resistance to oils, heat, wear, and demanding operating conditions across hydraulic, automotive, oil and gas, and industrial systems.
- Hydraulic & Lubrication Systems
- Automotive & Industrial Equipment
- Oil & Gas Sealing Systems
- High-Temperature Industrial Applications
- Dynamic Sealing & Wear-Prone Assemblies
HNBR O Ring Manufacturing Capability
We provide in-house rubber product design and mold development, supporting custom HNBR O rings based on customer drawings, samples, dimensions, and sealing requirements.
Multiple Rubber Molding Processes
- Compression molding
- Transfer molding
- Injection molding
Process selection depends on O ring dimensions, compound characteristics, mold design, and production requirements.
Factory Scale & Production Capacity
- Factory area: 5,000 m²
- Production lines: 20
- Mold inventory: 20,000+
- Technical team: 40+ technicians
- Monthly production capacity: Up to 10 million rubber parts across product categories
Custom mold development and production planning help align the manufactured parts with the customer's approved specifications and order volume.
HNBR O Ring Quality Control
-
Material & Compound Verification
HNBR material selection is reviewed against specified hardness, operating temperature, contact media, and sealing conditions to reduce the risk of compound incompatibility and premature failure.
-
Dimensional Inspection
Critical ID, OD, cross-section diameter (CS), and dimensional tolerances are checked against approved drawings and applicable specifications to support accurate groove fit and sealing compression.
-
Mechanical & Physical Performance Testing
Laboratory testing equipment is used to evaluate relevant material and product properties, including hardness, tensile strength, elongation, and compression behavior according to project requirements.
-
Heat, Oil & Aging Resistance Validation
HNBR compound suitability is evaluated against specified temperature, oil or fluid exposure, and aging conditions to help maintain sealing performance throughout the intended service life.
-
Surface Defect & Appearance Inspection
Visual and equipment-assisted inspection checks for flash, cracks, cuts, bubbles, deformation, and other molding defects that may affect installation, sealing integrity, or service life.
-
Sealing Failure Prevention
Material selection, dimensional review, and application-condition assessment help address common failure risks such as excessive compression, extrusion, wear, thermal aging, and fluid incompatibility.
-
Quality Management & Certifications
IATF 16949, ISO 9001, ISO 14001, and ISO 45001 are within our quality and management systems. Required certificates, test reports, and product-specific compliance documents can be confirmed according to project requirements.
B2B Ordering & Supply Support
Flexible MOQ & Order Quantities: MOQ varies according to O ring size, material, tooling, and customization requirements, supporting both trial orders and volume production.
Sample Production & Approval: Samples are available for evaluation before bulk production, with a typical lead time of 3–15 days; shipping charges apply to free samples.
Bulk Production & Delivery: Standard orders typically require 10–30 days after order details and production are confirmed, depending on order quantity and customization requirements.
Shipping & Delivery Terms: Available delivery terms include EXW, FOB, CFR, and CIF, allowing buyers to select arrangements based on destination, freight costs, and import requirements.
Packaging & Order Identification: Packaging and labeling requirements can be arranged according to product dimensions, quantities, and customer specifications to support identification and inventory management.
One-Year Quality Guarantee: A 1-year quality guarantee covers manufacturing defects under normal usage conditions, providing support for qualifying product quality issues.
FAQ
Q: What Is the Difference Between HNBR and NBR O Rings?
A: HNBR O rings offer improved heat, ozone, and aging resistance over conventional NBR compounds, making them suitable for more demanding sealing environments.
Q: Are HNBR O Rings Suitable for Refrigerant Systems?
A: HNBR compatibility with refrigerants depends on the specific refrigerant, lubricant, operating temperature, and compound formulation, so application-specific verification is recommended.
Q: Can HNBR O Rings Be Used in High-Pressure Gas Applications?
A: HNBR O rings may be suitable for high-pressure gas service when the compound, extrusion gap, and sealing design meet operating requirements, including rapid gas decompression resistance where necessary.
Q: Are HNBR O Rings Compatible with Biodiesel and Alternative Fuels?
A: Compatibility varies with fuel composition, temperature, and exposure duration, so the selected HNBR compound should be validated against the actual fuel blend.
Q: What Causes HNBR O Rings to Swell or Harden?
A: Excessive swelling or hardening can result from fluid incompatibility, thermal aging, or prolonged exposure to operating conditions beyond the compound`s suitable range.
Q: When Should HNBR O Rings Be Replaced?
A: Replacement intervals depend on operating conditions, service life requirements, and inspection findings such as cracking, permanent deformation, swelling, or loss of elasticity.
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