Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of rubber ring gaskets in China. The company has world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale custom made rubber ring gaskets from our factory.
Rubber Ring Gaskets for Application-Specific Sealing
Custom rubber ring gaskets are manufactured to match specific sealing dimensions, rubber materials, hardness requirements, and equipment interfaces. Zhonggao supports drawing- and sample-based production for industrial buyers requiring consistent sealing performance, repeatable dimensions, and stable batch supply.
Technical Specifications
Rubber Material Selection
|
Material |
Operating Temperature |
Key Resistance |
|
EPDM |
-50°C to +150°C |
Water, Steam, Weather & Ozone |
|
NBR |
-40°C to +120°C |
Oil, Fuel & Hydraulic Media |
|
FKM |
-20°C to +200°C |
Oil, Fuel & Chemicals |
|
CR |
-40°C to +120°C |
Weather & Environmental Exposure |
|
Silicone |
-70°C to +220°C |
Wide-Temperature Flexibility |
Custom Rubber Ring Gasket Specifications
|
Parameter |
Options / Reference |
|
Rubber Material |
NBR, EPDM, FKM, Silicone (VMQ), CR |
|
Hardness |
NBR: 55–75 Shore A; EPDM: 40–90 Shore A; FKM: 65–85 Shore A; Silicone (VMQ): 55–65 Shore A; CR: 60–75 Shore A |
|
Inside Diameter (ID) |
10–500 mm* |
|
Outside Diameter (OD) |
15–550 mm* |
|
Thickness / Cross-Section |
1.5–10 mm* |
|
Dimensional Tolerance |
±0.10–±0.30 mm |
|
Operating Temperature |
NBR: -40°C to +120°C; EPDM: -50°C to +150°C; FKM: -20°C to +200°C; Silicone (VMQ): -70°C to +220°C; CR: -40°C to +120°C |
|
Pressure Rating |
NBR: <16 MPa; EPDM: <2.5 MPa; FKM: ≤20 MPa; Silicone (VMQ): ≤10 MPa; CR: ≤10 MPa |
|
Compression Set |
≤35%; automotive-grade compounds: ≤20% at 70°C × 22h |
|
Tensile Strength |
NBR: 8–14 MPa; EPDM: ≥7 MPa; FKM: 10–18 MPa; Silicone (VMQ): 6–10 MPa; CR: 9–15 MPa |
|
Elongation at Break |
NBR: 200–400%; EPDM: ≥200%; FKM: 150–300%; Silicone (VMQ): 200–500%; CR: 300–500% |
*Specifications are customized according to the gasket design, sealing structure, material requirements, operating conditions, and approved drawing or sample.
Custom Rubber Ring Gaskets
Rubber ring gaskets can be customized according to the sealing structure, operating conditions, installation requirements, and purchasing specifications.
We can provide:
• NBR
• EPDM
• FKM
• Silicone
• CR
• Application-specific compounds
Material and compound selection depends on the sealing medium, temperature, pressure, and required performance.
We can produce:
• ID
• OD
• Thickness / Cross-section
• Profile
• Dimensional tolerances
• Drawing-based specifications
Hardness can be selected according to:
• Available Shore A hardness
• Customer-specified hardness
• Application-based hardness recommendation
Available configurations include:
• Flat ring
• Molded ring
• Grooved profile
• Custom sealing profile
• Groove-matched design
Custom molds can be developed for molded gaskets. Available processes include:
• Compression molding
• Transfer molding
• Injection molding
• Die cutting
• CNC machining
• Extrusion & Splicing
• New tooling
• Existing tooling
• Prototype
• Sample approval
Samples can be produced for approval before mass production.
We can offer:
• Bulk packaging
• Individual packaging
• Customized labels
• Part numbers
• Batch identification
• Customer-specific packaging
You can provide:
• Customer drawings
• Customer specifications
• Private labeling
• Approved sample retention
• Repeat-order specifications
We can use these details to evaluate and develop the gasket according to your requirements.
Manufacturing Capacity
Zhonggao operates a 5,000 m² manufacturing facility with 20 production lines, 40+ technicians, and 20,000+ molds, with a stated monthly production capacity of up to 10 million rubber parts. This manufacturing setup supports prototype development, small-batch production, and large-volume repeat orders.
Quality Control
Raw Material Inspection
Rubber compounds are checked against the approved material, hardness, and formulation requirements before production.
Dimensional Inspection
Critical ID, OD, thickness, cross-section, and profile dimensions are inspected against approved drawings and specified tolerances.
Physical Property Testing
Finished or sampled materials can be checked for hardness, tensile strength, elongation, and compression set according to the approved material specification and test requirements.
Batch Consistency
Production records, inspection results, and approved samples are used to maintain consistent material and dimensional requirements across repeat orders.
Zhonggao's quality system includes IATF 16949, ISO 9001, ISO 14001, and ISO 45001 certifications.
Compliance & Quality Documentation
• Material test reports
• Dimensional inspection reports
• Physical property test results
• Certificate of conformity
• Relevant Management System Certifications
From Sample Approval to Mass Production
The production workflow follows the approved product requirements from initial review through sample validation and mass production, helping buyers confirm the gasket specification before placing volume orders.
1. Drawing or Sample Review: Review the supplied drawing, sample, dimensions, material, hardness, tolerances, and operating requirements.
2. Material & Process Confirmation: Confirm the selected rubber compound and suitable manufacturing method.
3. Tooling Development: Develop or prepare dedicated tooling when required by the gasket design.
4. Sample Production: Produce samples for dimensional and performance verification.
5. Sample Approval: Confirm the sample and finalized production specifications before volume production.
6. Mass Production: Manufacture the approved gasket specification according to the confirmed production and inspection requirements.
7. Final Inspection & Packing: Complete finished-product inspection, identification, and packaging before shipment.
B2B Order Support
Zhonggao supports sample orders, trial production, and volume orders with flexible purchasing arrangements based on the gasket design, material, tooling requirements, and order quantity.
- Sample Lead Time: 3–15 days
- Mass Production Lead Time: 10–30 days after order details are confirmed
- MOQ: Flexible according to product design, tooling, material, and order quantity
- Order Volume: Supports sample, trial, small-batch, and large-volume production
- OEM Production: Available based on buyer-provided drawings, samples, specifications, or customer-supplied molds
- Repeat-Order Support: Approved drawing, material specification, tooling, approved sample, and inspection requirements can be retained as production references for subsequent orders
FAQ
Q: What Is a Rubber Ring Gasket Used For?
A: A rubber ring gasket is used to create a sealing interface between two mating surfaces, helping prevent the leakage of liquids or gases. It is commonly used in piping, pumps, valves, hydraulic equipment, automotive systems, and industrial machinery.
Q: What Is the Difference Between a Rubber Ring Gasket and an O-Ring?
A: A rubber ring gasket is a broader sealing component category that can include different ring geometries, thicknesses, and sealing profiles. An O-ring has a standardized circular cross-section and is typically installed in a groove designed specifically for O-ring sealing.
Q: How Do I Measure a Rubber Ring Gasket?
A: Measure the inside diameter (ID), outside diameter (OD), and thickness or cross-section of the existing gasket. For non-standard profiles, also measure the profile width, height, holes, cutouts, and installation dimensions, preferably with a drawing or dimensional sketch.
Q: Which Rubber Is Best for Water Sealing?
A: EPDM is commonly selected for water sealing because it provides a working temperature range of approximately -50°C to +150°C and good resistance to water, weathering, and ozone. NBR, FKM, Silicone, and CR may be selected when other operating conditions require different material properties.
Q: Which Rubber Ring Gasket Is Suitable for Oil or Fuel?
A: NBR is commonly used for oil and fuel-related sealing because of its oil resistance and operating temperature range of approximately -40°C to +120°C. FKM can be considered for applications requiring higher temperature resistance, with a typical range of -20°C to +200°C.
Q: What Hardness Should a Rubber Ring Gasket Have?
A: Common rubber ring gasket hardness ranges are approximately 40–90 Shore A, depending on the selected material and sealing design. Softer compounds can provide greater conformability to mating surfaces, while harder compounds can provide greater resistance to deformation under compression.
Q: How Should Rubber Ring Gaskets Be Stored Before Installation?
A: Rubber ring gaskets should be stored in a cool, dry, and clean environment away from direct sunlight, ozone sources, heat, oils, and chemicals. They should also be protected from excessive compression, stretching, bending, or other deformation before installation.
Q: What Shipping Methods Are Available for Rubber Ring Gaskets?
A: Rubber ring gaskets can generally be shipped by air freight, sea freight, courier, or other agreed transportation methods according to order quantity, delivery schedule, destination, and packaging requirements. The suitable shipping method can be confirmed with the buyer before dispatch.
Request a Custom Rubber Ring Gasket Quote
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