Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of rubber flat gaskets in China. The company has world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale custom made rubber flat gaskets from our factory.
Rubber Flat Gaskets for Application-Specific Sealing
Rubber flat gaskets provide reliable static sealing between mating surfaces to help prevent liquid and gas leakage. Zhonggao supplies custom flat gaskets for industrial equipment, piping, automotive, HVAC, pumps, valves, and other sealing applications.
Technical Parameters
Rubber Material Selection
|
Material |
Operating Temperature |
Key Resistance |
|
NBR |
−40°C to +120°C |
Oil, Fuel & Hydraulic Media |
|
EPDM |
−50°C to +150°C |
Water, Steam, Weather & Ozone |
|
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 Flat Gasket Specifications
|
Parameter |
Specifications |
|
Rubber Material |
NBR, EPDM, FKM, CR, Silicone |
|
Hardness |
Shore A 30–90 |
|
Tensile Strength |
≥5 MPa* |
|
Elongation at Break |
≥200%* |
|
Compression Set |
≤35%* |
|
Tear Strength |
≥15 kN/m* |
|
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 |
|
Operating Pressure |
NBR: <16 MPa*; EPDM: <2.5 MPa* |
|
Inside Diameter (ID) |
15–600 mm* |
|
Outside Diameter (OD) |
30–700 mm* |
|
Thickness |
1.5–6.0 mm* |
|
Dimensional Tolerance |
±0.01 mm mold-making accuracy |
*Standard reference values. Actual performance may vary with material grade, rubber compound, gasket dimensions, sealing conditions, and operating conditions.
Custom Rubber Flat Gaskets
Custom rubber flat gaskets can be manufactured from drawings, samples, or defined technical requirements.
Custom Size & Shape
We can produce:
• Custom ID, OD, and thickness
• Flat, ring, full-face, square, rectangular, and other gasket shapes
• Holes, slots, cutouts, and application-specific profiles
Rubber Material & Hardness
Material and hardness can be selected according to:
• Sealing medium
• Operating temperature
• Pressure
• Environmental exposure
• Required Shore A hardness
Available materials include NBR, EPDM, FKM, CR, and Silicone / VMQ.
Dimensional Tolerance
Dimensional requirements can be controlled according to:
• ID, OD, and thickness tolerances
• Critical sealing dimensions
• Hole and cutout locations
• Approved technical drawings
Physical Properties
Product performance requirements can be specified for:
• Tensile strength
• Elongation at break
• Compression set
• Tear strength
• Other project-specific physical properties
Drawing / Sample
You can provide:
• CAD or technical drawings
• Dimensions and tolerances
• Material and hardness requirements
• Existing gasket samples
We can use these details to evaluate the design and develop the required gasket.
OEM Production
We support:
• Drawing- or sample-based manufacturing
• Custom tooling for molded gaskets
• OEM production with customer-provided molds
• Custom packaging, labels, and part numbers
Applications
Rubber flat gaskets are used for static sealing between mating surfaces across fluid-handling equipment, piping systems, machinery, and other industrial assemblies.
• Pumps
• Valves
• Piping Systems
• Industrial Machinery
• HVAC Equipment
• Automotive Systems
• Water & Wastewater Equipment
• Hydraulic Equipment
Manufacturing, Prototyping & Mass Production
Manufacturing methods are selected according to gasket geometry, material, tolerance, and order volume.
• Die Cutting
• Compression Molding
• Transfer / Injection Molding
• Prototyping
• Mass Production
Sample Lead Time: 3–15 days
Typical Delivery: 10–30 days after order confirmation
Our manufacturing resources support:
• 20 Production Lines for different rubber product requirements
• 20,000+ Molds for molded rubber components
• Up to 10 Million Parts / Month production capacity
• Automated cutting, molding, vulcanizing, and testing equipment
• Production support from prototype development to mass production
Quality Control
Zhonggao's quality control covers raw materials, dimensions, physical properties, appearance, and finished products, supported by 6 full-time QC inspectors and laboratory testing equipment.
Raw Material Inspection
Rubber materials are checked against the approved material and compound requirements before production to verify material conformity.
Dimensional Inspection
Critical ID, OD, thickness, profiles, holes, cutouts, and other dimensions are inspected against approved drawings, specifications, and applicable tolerances.
Physical Property Testing
Applicable tensile strength, elongation, compression set, hardness, and tear strength are tested according to approved product requirements and relevant test methods.
Appearance Inspection
Finished gaskets are inspected for surface defects, cracks, contamination, deformation, edge conditions, and other visible issues that could affect installation or sealing.
Finished Product & Batch Inspection
Finished gaskets are checked against approved specifications before shipment, while production and inspection records support quality consistency across repeat orders.
Certifications
Zhonggao's quality and management systems are certified to IATF 16949, ISO 9001, ISO 14001, and ISO 45001.
Production Capacity, Order Support & Delivery
Zhonggao supports prototype, low-volume, and mass-production requirements with production equipment, tooling resources, material sourcing, and dedicated quality inspection.
- MOQ: Project-dependent based on design, material, tooling & quantity
- Sample Lead Time: 3–15 days
- Mass Production Lead Time: Typically 10–30 days
- Repeat Orders: Controlled against approved specifications
- Packaging: Protective packing, quantity control & batch identification
- Delivery: Packaging and logistics arranged for international shipment
FAQ
Q: Can Rubber Flat Gaskets Be Used for Flange Sealing?
A: Yes. Rubber flat gaskets are commonly used for flange sealing in piping, pumps, valves, HVAC systems, and industrial equipment. The gasket dimensions, thickness, hardness, and material should match the flange design and operating conditions.
Q: Can You Supply 50,000 Rubber Flat Gaskets Per Month?
A: Yes. Zhonggao supports small-, medium-, and large-volume rubber gasket orders. Monthly supply capacity depends on gasket size, material, manufacturing process, tooling, and production scheduling, so recurring high-volume requirements can be evaluated based on the specific project.
Q: How Do You Maintain Consistency for Repeat Rubber Gasket Orders?
A: Repeat orders are produced against the approved material, tooling, drawings, dimensions, and inspection requirements. Production and inspection records help maintain consistent specifications and quality across repeat batches.
Q: What Shipping Methods Are Available for Custom Rubber Flat Gaskets?
A: Shipping can be arranged according to order quantity, delivery schedule, destination, and logistics requirements. Common options include sea freight, air freight, and express delivery, allowing buyers to balance transportation cost and delivery time.
Request a Custom Rubber Flat Gasket Quote
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