Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of hydraulic rubber gaskets in China. The company has world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale custom made hydraulic rubber gaskets from our factory.
Hydraulic Rubber Gaskets
Custom hydraulic rubber gaskets manufactured to match your sealing interface, dimensions, rubber material, fluid medium, temperature, and pressure requirements. Available in application-specific compounds and configurations with sample approval and repeat production support for hydraulic pumps, valves, cylinders, manifolds, and industrial equipment.
Technical Specifications
Rubber Material Selection
|
Rubber Material |
Key Performance |
|
NBR |
Mineral Oil, Hydraulic Fluid & Fuel Resistance |
|
HNBR |
Hydraulic Fluid, Heat & Wear Resistance |
|
FKM |
High-Temperature & Chemical Resistance |
|
EPDM |
Water, Steam, Ozone & Weather Resistance |
Hydraulic Rubber Gasket Specifications
|
Technical Item |
Reference Value / Range |
|
Rubber Material |
NBR, HNBR, FKM, EPDM |
|
Temperature Range |
NBR: -40°C to +120°C; HNBR: 40°C to +150°C; FKM: -20°C to +200°C; EPDM: -50°C to +150°C; short-term up to +180°C |
|
Rubber Hardness |
NBR: 55–75 Shore A; HNBR: 70–90 Shore A; FKM: 65–85 Shore A; EPDM: 40–90 Shore A* |
|
Tensile Strength |
≥7 MPa; typical 8–20 MPa depending on compound |
|
Elongation at Break |
≥200%*; typical 200–500%* |
|
Compression Set |
≤20% at 70°C × 22 h* |
|
Density |
0.90–1.50 g/cm³* |
|
Thickness |
1.0–10.0 mm* |
|
ID |
10–1,000 mm* |
|
OD |
20–1,200 mm* |
|
Dimensional Tolerance |
±0.10–±0.50 mm, depending on size and geometry |
|
Working Pressure |
Up to 40 MPa (4,000 psi)* |
|
Recommended Compression |
10–30% of gasket thickness* |
|
Flange Surface Roughness |
Ra 1.6–6.3 μm* |
|
Mold Tolerance |
Up to ±0.01 mm |
|
Hardness Tolerance |
±5 Shore A* |
*Actual performance depends on the selected compound, gasket geometry, flange configuration, compression, hydraulic fluid, pressure, and temperature.
Custom Hydraulic Rubber Gaskets
We manufacture custom hydraulic rubber gaskets based on your drawing, sample, equipment, sealing interface, and working conditions.
Rubber material, compound formulation, and hardness can be selected according to:
• Hydraulic fluid or sealing medium
• Operating temperature
• Working pressure
• Compression requirements
• Static or dynamic sealing conditions
• Required hardness and hardness tolerance
Available material options include NBR, HNBR, FKM, and EPDM, with compound selection matched to the actual hydraulic application.
We can produce gaskets to match your sealing interface, including:
• Custom ID, OD, length, width, and thickness
• Cross-section and sealing profile
• Hole patterns, slots, and cutouts
• Flange, ring, rectangular, oval, washer, and irregular geometries
• Other custom dimensions and profiles
Dimensions and tolerances can be manufactured according to approved drawings, samples, and application requirements.
Gasket geometry can be matched to the installation structure and sealing interface, including:
• Groove dimensions
• Compression and compression ratio
• Gland depth
• Sealing clearance
• Mating surface requirements
• Surface finish
• Available installation space
These specifications help ensure the gasket fits the sealing interface and performs correctly after installation.
We support drawing-based and sample-based production for hydraulic rubber gaskets. Available services include:
• Custom mold development
• Prototype and sample production
• Compression molding
• Transfer molding
• Injection molding
• Die cutting
Samples can be produced for approval before mass production, with tooling and production methods selected according to gasket design and order requirements.
Packaging and identification can be arranged according to your supply requirements, including:
• Individual or bulk packaging
• Customer part numbers
• Product labels
• Batch identification
• Custom packaging requirements
These options help align gasket identification, packaging, and batch management with your purchasing and inventory processes.
Hydraulic Rubber Gasket Applications
Custom hydraulic rubber gaskets are used in fluid-handling and hydraulic equipment where reliable sealing is required between mating components
- Hydraulic Equipment
- Fluid & Piping Equipment
- Industrial Machinery
- Sealing Applications
Hydraulic Gasket Manufacturing Capability
We support custom hydraulic rubber gasket production with 20+ production lines, 20,000+ molds, and monthly capacity of up to 10 million rubber parts. Available processes include compression molding, transfer molding, injection molding, and die cutting, with custom tooling, prototype production, sample approval, and repeat production for B2B orders.
From Approved Sample to Repeat Production
Prototype & Sample Process
Drawing/Sample → Material Review → Prototype → Sample Approval
Mass Production Process
Approved Specification → Production → Inspection → Packing → Delivery
Repeat Orders
• Approved specification retention
• Customer part number
• Drawing revision
• Material identification
• Production records
• Repeat-order reference
Hydraulic Gasket Quality Control
Raw Material & Compound Inspection
Hydraulic gasket raw materials are checked against the approved compound, material grade, and hardness requirements before production to verify material conformity.
Dimensional Inspection
Critical ID, OD, thickness, profiles, holes, cutouts, and other dimensions are inspected against the approved drawing, specifications, and applicable tolerances.
Physical Property Testing
Applicable hardness, tensile strength, elongation, and compression-set properties are tested according to approved product requirements and relevant test methods.
Finished Product Inspection
Finished hydraulic gaskets are inspected for surface defects, edge conditions, cracks, blisters, foreign matter, deformation, and critical dimensional features that could affect installation or sealing.
Batch Traceability
Material batches, production batches, inspection records, and shipment records are maintained to support material identification and consistency across repeat orders.
Zhonggao's quality system includes dedicated QC personnel, laboratory testing equipment, raw-material inspection, and finished-product inspection, supported by IATF 16949, ISO 9001, ISO 14001, and ISO 45001 certifications.
B2B Ordering & Supply Support
Order terms can be arranged according to the gasket specification, tooling requirements, and order quantity, with support from specification review and sampling through mass production and shipment.
- MOQ: Flexible according to gasket size, material, tooling, and production requirements.
- Sample Lead Time: Typically 3–15 days for prototype or sample production.
- Mass Production Lead Time: Typically 10–30 days after specifications and samples are confirmed.
- Order Volume: Prototype, small-batch, and large-volume hydraulic gasket orders are supported.
- Specification Review: Drawings, samples, dimensions, materials, sealing requirements, and operating conditions.
- Sample Approval: Prototype samples can be produced for evaluation before mass production.
- Production: Orders are manufactured according to approved specifications, materials, tooling, and production requirements.
- Shipment: Finished gaskets are inspected and prepared according to agreed packaging and identification requirements.
FAQ
Q: What Hydraulic Fluids Are Compatible with Rubber Gaskets?
A: Compatibility depends on the rubber compound and the specific hydraulic fluid. NBR is commonly used with mineral-oil-based hydraulic fluids, while FKM, HNBR, and EPDM may be considered for different temperature, chemical, or water-based fluid conditions. The exact fluid grade should be reviewed before material selection.
Q: Can Hydraulic Rubber Gaskets Be Used for High-Pressure Applications?
A: Hydraulic rubber gaskets can be designed for high-pressure sealing, but pressure capability depends on gasket geometry, material hardness, compression, sealing clearance, flange structure, and operating conditions. The actual working pressure and pressure peaks should be reviewed when confirming the gasket design.
Q: Can You Make Replacement Hydraulic Rubber Gaskets from an Existing Sample?
A: Yes. An existing gasket sample can be provided for evaluation and reproduction. The sample can be reviewed together with available dimensions, equipment information, sealing location, and working conditions to develop a replacement gasket matching the original application.
Q: What Causes Hydraulic Rubber Gaskets to Leak?
A: Leakage can result from incorrect gasket dimensions, unsuitable material compatibility, insufficient or excessive compression, extrusion, surface damage, installation problems, or operating conditions beyond the approved requirements. Reviewing the sealing interface and service conditions can help identify the appropriate gasket design.
Q: Are Hydraulic Rubber Gaskets Suitable for Static and Dynamic Sealing?
A: Hydraulic rubber gaskets are primarily selected according to the sealing structure and application. Static sealing applications are generally more straightforward, while dynamic applications require additional consideration of movement, friction, wear, clearance, pressure, and material properties before the gasket design is confirmed.
Q: Can Hydraulic Rubber Gaskets Be Used for Outdoor Hydraulic Equipment?
A: Yes, when the selected rubber compound provides suitable resistance to the application's temperature, weather, ozone, UV exposure, hydraulic fluid, and other environmental conditions. EPDM, CR, FKM, and other compounds may be considered depending on the actual service environment.
Q: How Should Hydraulic Rubber Gaskets Be Stored Before Installation?
A: Gaskets should be stored in a clean, dry environment away from direct sunlight, ozone-generating equipment, excessive heat, and conditions that could cause deformation or contamination. Packaging and storage requirements can also be specified according to the application and supply requirements.
Q: What Shipping Methods Are Available for Hydraulic Rubber Gasket Orders?
A: Hydraulic rubber gasket orders can be arranged for international shipment according to order quantity, destination, delivery schedule, and packaging requirements. Air, sea, express, or other suitable transportation methods can be discussed during order confirmation.
Request a Custom Hydraulic Rubber Gasket Quote
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