Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of rubber flange gaskets in China. The company has world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale custom made rubber flange gaskets from our factory.
Rubber Flange Gaskets for Application-Specific Sealing
Custom rubber flange gaskets provide static sealing between flanged surfaces to help prevent fluid leakage and maintain reliable connections in piping and equipment. Available in multiple rubber compounds, profiles, and configurations, they can be manufactured to match your flange and operating requirements.
Technical Parameters
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 |
Rubber Flange Gasket Specifications
|
Parameter |
Specifications |
|
Gasket Type |
Full-Face, Ring-Type, Custom Profile |
|
Material Option |
EPDM, NBR, FKM, CR, Silicone |
|
Flange Standard |
ANSI / ASME, DIN, JIS, ISO, Drawing-Based |
|
Hardness |
EPDM: 40–90 Shore A; NBR: 55–75 Shore A; FKM: 65–85 Shore A; CR: 60–75 Shore A; Silicone: 55–65 Shore A |
|
Operating Temperature |
EPDM: -50°C to +150°C; NBR: -40°C to +120°C; FKM: -20°C to +200°C; CR: -40°C to +120°C; Silicone: -70°C to +220°C |
|
Short-Term Temperature |
EPDM: up to +180°C |
|
Pressure |
NBR: <16 MPa*; EPDM: <2.5 MPa* |
|
Tensile Strength |
EPDM: ≥7 MPa* |
|
Elongation at Break |
≥200%* |
|
Compression Set |
NBR: ≤20% at 70°C × 22 h |
|
Gasket Thickness |
1.5–6.0 mm* |
|
Nominal Size |
DN15–DN600* |
|
Inside Diameter (ID) |
15–600 mm* |
|
Outside Diameter (OD) |
30–700 mm* |
|
Bolt Hole Diameter |
10–40 mm* |
|
Bolt Hole Quantity |
4–24 holes* |
|
Mold Accuracy |
Within ±0.01 mm |
*Standard references values. Actual performance depends on material grade, specific rubber compound, flange design, dimensions, and operating conditions.
Custom Rubber Flange Gaskets
Manufactured according to your material, size, thickness, profile, bolt pattern, hardness, and flange requirements.
Material & Hardness
Rubber compound and hardness can be selected according to:
• EPDM, NBR, FKM, CR, or Silicone
• Required Shore A hardness
• Sealing medium, temperature, pressure, and environmental conditions
01
Size & Thickness
We can produce:
• Custom ID, OD, and overall dimensions
• Gasket thickness according to drawing or sealing requirements
• Dimensions based on equipment interfaces or specified requirements
02
Profile & Bolt Pattern
Available configurations include:
• Full-face, ring-type, and custom profiles
• Bolt-hole patterns according to flange standards or drawings
• Custom holes, positions, and configurations when specified
03
Flange Standard
We can manufacture according to:
• ANSI / ASME
• DIN, JIS, or ISO
• Customer drawings for non-standard flange configurations
04
Applications
Rubber flange gaskets are used for static sealing at flanged connections across piping, fluid-handling equipment, and industrial machinery.
• Pumps
• Valves
• Tanks
• Piping Systems
• Water Treatment Equipment
• Hydraulic Equipment
• Industrial Machinery
Manufacturing
Drawing / Sample Review → Material Preparation → Cutting or Molding → Inspection → Final QC → Packaging
Zhonggao supports die cutting, compression molding, transfer molding, and injection molding, with 20,000+ molds, 40+ technicians, and a 5,000 m² factory. Mold error is controlled within ±0.01 mm for applicable tooling, ensuring manufacturing consistency of rubber flange gaskets.
For production planning, we supports quantities such as 5,000, 50,000, or 500,000 pieces, with a monthly production capacity of up to 10 million rubber parts across its production operations.
Rubber Flange Gasket Quality Control
Material & Hardness Inspection
Rubber compounds are checked against the approved EPDM, NBR, FKM, CR, or Silicone material and specified hardness requirements before production to verify material conformity.
Dimensional Inspection
Critical ID, OD, overall dimensions, and thickness are inspected against approved drawings, specifications, and applicable tolerances.
Profile & Bolt Pattern Inspection
Full-face, ring-type, and custom profiles, together with bolt-hole positions and patterns, are checked against the approved drawing or applicable flange requirements.
Flange Standard Verification
Finished gasket dimensions and configurations are verified against applicable ANSI / ASME, DIN, JIS, ISO, or drawing-based requirements to ensure compatibility with the specified flange.
Appearance & Finished Product Inspection
Finished gaskets are inspected for surface defects, cracks, blisters, foreign matter, edge defects, warping, deformation, and other visible issues that could affect installation or sealing.
Zhonggao's quality system includes dedicated QC personnel, laboratory testing equipment, raw-material inspection, and finished-product inspection, with IATF 16949, ISO 9001, ISO 14001, and ISO 45001 certifications.
Sample Approval Before Mass Production
Verify the gasket before volume production through:
Specification Review → Sample Production → Inspection → Customer Approval → Mass Production
Sample production is available with a typical lead time of 3–15 days.
FAQ
Q: Can You Manufacture Gaskets From a Drawing or Sample?
A: Yes. Rubber flange gaskets can be manufactured from a 2D drawing, CAD file, product specification, or existing gasket sample. These references help confirm the required dimensions, profile, bolt pattern, and other production details.
Q: What Information Should I Provide When Ordering Rubber Flange Gaskets?
A: Provide the gasket dimensions, material requirement, thickness, flange standard, bolt pattern, operating temperature, pressure, sealing medium, and order quantity. A drawing or existing gasket sample can also be provided for specification review.
Q: How Do You Handle Custom Rubber Flange Gasket Projects?
A: The process covers specification review, material confirmation, tooling or production preparation, sample production when required, customer approval, mass production, inspection, and shipment.
Q: Can Rubber Flange Gaskets Be Supplied for Repeat Orders?
A: Yes. Confirmed drawings, specifications, material requirements, and production records can be used as references for repeat orders, helping maintain consistency across subsequent batches.
Q: What Is the Lead Time for Large-Volume Rubber Flange Gasket Orders?
A: Mass production typically takes 10–30 days after specifications, materials, tooling, and order details are confirmed. The actual delivery schedule depends on production quantity and project requirements.
Q: What Is the MOQ?
A: MOQ for custom rubber flange gaskets is flexible and depends on the gasket size, material, manufacturing process, tooling requirements, and order quantity. Zhonggao can discuss the appropriate MOQ based on the specific project rather than applying one fixed quantity to every gasket order.
Q: How Are Rubber Flange Gaskets Packaged for Shipment?
A: Gaskets can be packaged according to product dimensions, quantity, and customer requirements to help protect them from deformation, contamination, and damage during handling and transportation.
Q: What Shipping Methods Are Available for Rubber Flange Gaskets?
A: Shipping can be arranged by sea, air, express, or other suitable freight methods according to order quantity, delivery schedule, destination, and customer requirements.
Request a Custom Rubber Flange Gasket Quote
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