Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of silicone rubber gaskets in China. The company has world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale custom made silicone rubber gaskets from our factory.
Silicone Rubber Gaskets
Zhonggao manufactures custom silicone rubber gaskets for industrial, equipment, electrical, food-contact, medical-related, and other sealing applications. Gaskets can be produced according to your drawings, samples, dimensions, material requirements, and working conditions, with manufacturing and inspection processes designed for consistent repeat orders.
Silicone Rubber Gasket Specifications
|
Parameter |
Typical / Reference Range |
|
Material |
Silicone Rubber (VMQ) |
|
Hardness |
30–80 Shore A |
|
Operating Temperature |
-60°C to +200°C |
|
Short-Term Temperature |
Up to +230°C |
|
Tensile Strength |
5–10 MPa |
|
Elongation at Break |
200–800% |
|
Compression Set |
≤30% |
|
Tear Strength |
10–30 kN/m |
|
Density |
1.10–1.30 g/cm³ |
|
Thickness |
0.5–10 mm, Custom |
|
Mold Accuracy |
Within ±0.01 mm |
*Typical values are for reference only and may vary according to silicone compound, hardness, formulation, curing system, test method, and operating conditions. Project-specific material data should be confirmed before production.
Custom Silicone Gasket Manufacturing
We manufacture custom silicone rubber gaskets according to your drawings, samples, dimensions, material requirements, and sealing conditions.
We can produce silicone rubber gaskets in different dimensions and geometries according to the sealing interface and equipment design:
• Custom ID, OD, length, width, and thickness
• Round, rectangular, square, oval, and flange shapes
• Irregular profiles, holes, slots, grooves, and cutouts
Silicone rubber compounds can be selected according to the required temperature range, hardness, sealing conditions, and application environment:
• General-purpose VMQ compounds
• Different Shore A hardness levels
• High- and low-temperature requirements
• Food-contact requirements where applicable
• Medical-related application requirements where applicable
• UV, ozone, and outdoor exposure
• Static sealing requirements
You can provide the technical information available for your existing or new gasket design:
• CAD or technical drawings
• Dimensions and tolerances
• Material and hardness requirements
• Physical gasket samples
• Equipment or assembly information
• Operating temperature and sealing conditions
We can review these requirements to determine the suitable gasket structure, material, manufacturing method, and production approach.
For molded silicone rubber gaskets, tooling and production methods are selected according to the gasket structure, dimensional requirements, and order volume:
• Compression molding
• Transfer molding
• Injection molding
• Die cutting
• Custom mold development
• Prototype and sample production
Samples can be produced for dimensional or application approval before mass production.
OEM production can be arranged according to your product specifications, branding, packaging, and tooling requirements:
• Customer drawings
• Customer-provided samples
• Customer-owned molds
• Custom part numbers
• Custom packaging
• Labels and identification
• OEM production
For customer-provided molds, production can be carried out according to the customer's tooling and project requirements, with confidentiality measures applied to protect drawings and technical information.
Silicone Rubber Gasket Applications
Silicone rubber gaskets can be customized for sealing interfaces and equipment requirements across food processing, medical, electrical, HVAC, and industrial applications.
• Food Processing Equipment
• Medical Equipment
• Electrical Enclosures
• HVAC Equipment
• Industrial Equipment
FKM Gasket Manufacturing Capability
Zhonggao operates a 5,000 m² factory with 20 production lines, more than 20,000 molds, and a team of 40+ experienced technicians, with a stated monthly production capacity of up to 10 million rubber parts. Its manufacturing resources cover molding, material processing, tooling, and inspection, providing the production base required for both custom development and high-volume rubber component orders.
Silicone Rubber Gasket Quality Control
Raw Material Inspection
Silicone rubber materials are checked against the approved compound, hardness, and material requirements before production to verify material conformity and batch consistency.
Process Control
Molding, vulcanization, trimming, deflashing, and other applicable processing stages are controlled according to the approved production requirements to maintain consistent gasket geometry and manufacturing quality.
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, compression set, tear strength, and other physical properties are tested according to the approved product requirements and relevant test methods.
Appearance Inspection
Finished gaskets are inspected for surface defects, flash, burrs, cracks, blisters, foreign matter, deformation, color inconsistency, and other visible defects that could affect installation or sealing.
Finished Product & Batch Inspection
Finished products are checked against approved specifications before packing and shipment, while production, inspection, and applicable traceability records support consistency across repeat orders.
Zhonggao's quality resources include dedicated QC personnel, laboratory testing equipment, automatic inspection equipment, raw-material inspection, and finished-product inspection. Its manufacturing management systems are supported by IATF 16949, ISO 9001, ISO 14001, and ISO 45001 certifications.
OEM Silicone Gasket Supply
Zhonggao provides OEM rubber gasket support from drawing or sample evaluation through tooling, prototyping, production, and repeat orders, with each stage arranged around the buyer's confirmed specifications and project requirements.
• Drawing / Sample Evaluation
• Material & Hardness Selection
• Mold Design & Development
• Prototype Production
• Sample Approval
• Mass Production
• Customer-Owned Mold Production
• Repeat-Order Support
Production & Supply Information
- Prototype & Sample Lead Time: Prototype and sample production is available before mass production, with a typical sample lead time of 3–15 days.
- Tooling: Custom mold development is available for molded silicone rubber gasket designs.
- MOQ: MOQ is flexible according to gasket size, material, manufacturing process, tooling, and project requirements.
- Mass Production Lead Time: Small, medium, and large-volume orders are supported with a typical lead time of 10–30 days after order details and production are confirmed.
- Inspection Documents: Material and inspection reports can be provided according to project requirements.
- Packaging: Bulk, bagged, labeled, barcode, or customer-specified packaging is available.
- Repeat Orders: Approved drawings, tooling, material specifications, and production requirements can be retained for repeat production.
- International Shipment: Delivery can be arranged under EXW, FOB, CFR, or CIF terms according to the order requirements.
- Quality Issues: A 1-year quality guarantee is provided for qualified product quality issues.
FAQ
Q: Can Silicone Rubber Gaskets Be Used for Static Sealing Applications?
A: Yes. Silicone rubber gaskets are commonly used for static sealing between mating components where the gasket remains compressed after installation. Proper gasket design, compression, surface condition, and material selection are important for maintaining reliable sealing performance.
Q: How Do Silicone Rubber Gaskets Compare With EPDM Gaskets?
A: Silicone is often preferred when a wider temperature range, low-temperature flexibility, or strong resistance to UV, ozone, and weathering is required. EPDM can be a better choice for certain water, steam, and chemical environments, so material selection should be based on the actual operating conditions.
Q: What Causes Silicone Gasket Failure During Equipment Operation?
A: Common causes can include excessive compression, insufficient compression, unsuitable material selection, dimensional mismatch, surface damage, improper installation, or operating conditions beyond the specified material limits. Reviewing the failed gasket and application conditions can help identify the appropriate corrective solution.
Q: How Do Silicone Rubber Gaskets Perform in High-Temperature Applications?
A: Silicone rubber maintains useful flexibility across a wide temperature range and is suitable for many high-temperature sealing applications. However, actual performance depends on the silicone formulation, hardness, compression conditions, exposure time, and operating environment, so the material grade should be confirmed against the required temperature conditions.
Q: What Should Buyers Consider When Selecting Silicone Rubber Gaskets?
A: Buyers should evaluate the sealing geometry, dimensions and tolerances, silicone grade, hardness, operating temperature, compression requirements, media exposure, and applicable compliance requirements. These factors help determine the appropriate gasket structure, material specification, and manufacturing method for the intended equipment.
Request a Custom Silicone Rubber Gasket Quote
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