Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of silicone o ring in China. The company has world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale custom made silicone o ring from our factory.
Silicone O Rings
Silicone O rings provide flexible, reliable sealing for applications requiring temperature resistance, electrical insulation, and protection against moisture and environmental exposure. Custom dimensions, hardness, and material specifications help meet equipment requirements and maintain consistent sealing performance.
Silicone O Ring Specifications
|
Parameter |
Typical Reference |
|
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% |
|
Tear Strength |
10–30 kN/m |
|
Compression Set |
≤30%; test conditions to be specified |
|
Density |
1.10–1.30 g/cm³ |
|
Inner Diameter (ID) |
1–1,000 mm* |
|
Outside Diameter (OD) |
3–1,040 mm* |
|
Cross-Section Diameter (CS) |
1–20 mm* |
*Actual available sizes and tolerances depend on tooling, mold design, and manufacturing requirements.
Custom Silicone O Ring Manufacturing
We manufacture custom silicone O rings based on your drawings, samples, equipment, and operating conditions.
Custom Sizes & Dimensions
We can produce:
- Custom inner diameter (ID) and cross-section diameter (CS)
- Standard and non-standard O ring sizes
- Specified dimensional tolerances
- Dimensions matched to existing sealing grooves and assemblies
Silicone Material & Hardness
Silicone compound and hardness can be selected according to:
- Continuous and peak operating temperatures
- Contact media and chemical compatibility
- Hardness and compression requirements
- Tensile strength and tear resistance
- Static or dynamic sealing conditions
Drawing / Sample Matching
You can provide:
- CAD or technical drawings
- ID, CS, and dimensional tolerances
- Sealing groove dimensions and assembly requirements
- Silicone material, hardness, and performance requirements
- Existing O ring samples or part numbers
We use these details to evaluate dimensional compatibility and identify a suitable silicone specification for your application.
Mold & Production
Custom molds can be developed for molded silicone O rings. Available processes may include:
- Compression molding
- Transfer molding
- Injection molding
Samples can be submitted for approval before mass production to verify dimensions, material properties, and sealing requirements.
OEM Customization
We support customized requirements for:
- Dimensions and tolerances
- Silicone compound and hardness
- Color and application-specific performance
- Packaging and labeling
- Part numbers and product identification
- OEM production using customer-provided molds
For customer-provided molds, mold ownership, authorized use, confidentiality, and intellectual property protection can be defined according to the project agreement.
Silicone O Ring Applications
Silicone O rings serve a wide range of applications where temperature flexibility, moisture resistance, electrical insulation, and reliable sealing are essential to equipment performance and service life.
- Food-Contact Equipment & Processing Systems
- Medical & Laboratory Equipment
- HVAC, Appliances & Electrical Equipment
- Outdoor Equipment & Environmental Sealing
- Industrial Equipment Requiring Wide-Temperature Sealing
Silicone O Ring Manufacturing Capability
Our scalable production capacity, precision mold manufacturing, and multi-stage quality control help buyers secure consistent silicone O ring quality, reduce dimensional defects, and maintain reliable supply for repeat orders.
Scalable Production Capacity
5,000 m² factory, 20 production lines, and capacity of up to 10 million rubber parts per month.
20,000+ molds and 40+ technicians support custom tooling and repeat-order supply.
Precision Mold Manufacturing
In-house mold design and manufacturing based on drawings or samples.
Mold error controlled within ±0.01 mm to support dimensional consistency and assembly fit.
Rubber Molding Processes
Compression, transfer, and injection molding support different part designs and production requirements.
Quality Control & Batch Consistency
Raw material and production-process inspections, plus 100% inspection before shipment, help reduce defects and maintain consistent quality.
Silicone O Ring Quality Control
-
Material Verification
Silicone rubber materials are checked against the specified compound, hardness, and application requirements to support consistent sealing performance.
-
Dimensional Inspection
Critical ID, OD, cross-section diameter, and other dimensions are inspected against approved drawings, specifications, and applicable tolerances.
-
Hardness Testing
Shore A hardness is checked against the specified range to verify material consistency and sealing compression requirements.
-
Mechanical Performance Testing
Tensile strength, elongation at break, tear resistance, and compression set are evaluated against specified requirements where applicable.
-
Visual & Surface Inspection
O rings are checked for cracks, flash, cuts, deformation, and surface defects that could compromise sealing integrity.
-
Production Process Control
Quality checks cover rubber molding and vulcanization through final inspection to help maintain consistency between production batches.
-
Final Inspection & Certification
Our quality system includes 6 full-time QC inspectors and automatic full-inspection equipment. Its management systems are certified to IATF 16949, ISO 9001, ISO 14001, and ISO 45001.
B2B Ordering & Supply Support
Sample Availability: Samples are available for pre-production evaluation, with a typical lead time of 3–15 days; sample charges may apply, while shipping costs are payable by the buyer.
MOQ & Order Flexibility: MOQ is flexible for custom silicone O rings and depends on dimensions, material, tooling, production process, and order requirements.
Bulk Production Lead Time: Standard production typically takes 10–30 days after order details and production requirements are confirmed.
Packaging & Shipping Terms: Packaging is arranged according to product and order requirements, with EXW, FOB, CFR, and CIF delivery terms available to suit different logistics needs.
Quality Assurance & Warranty: A 1-year quality guarantee covers manufacturing defects under normal usage conditions; inspection or third-party testing documentation can be arranged upon request.
FAQ
Q: Can silicone O rings be used in vacuum applications?
A: Silicone O rings can be used in some vacuum systems, but gas permeability and outgassing requirements should be evaluated for the specific application.
Q: Are silicone O rings suitable for high-purity water systems?
A: Silicone O rings may be suitable for high-purity water systems when the selected compound meets the system`s purity, extractables, and contamination-control requirements.
Q: What causes silicone O rings to swell or deteriorate?
A: Exposure to incompatible chemicals, excessive heat, mechanical stress, or unsuitable cleaning agents can cause swelling, hardening, cracking, or premature failure.
Q: Can silicone O rings be used with compressed air?
A: Silicone O rings can seal compressed-air systems when pressure, temperature, gas permeability, and the operating environment are compatible with the selected compound.
Q: How can silicone O ring leakage be prevented?
A: Correct gland design, suitable squeeze, smooth mating surfaces, compatible lubricants, and careful installation help reduce leakage and premature wear.
Q: Are silicone O rings compatible with cleaning and disinfecting chemicals?
A: Compatibility depends on the chemical concentration, temperature, contact duration, and silicone formulation, so testing under actual cleaning conditions is recommended.
Q: How should silicone O rings be stored to prevent premature aging?
A: Store silicone O rings in sealed, clean packaging in a cool, dry, dark environment away from direct sunlight, ozone sources, excessive heat, and incompatible chemicals.
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