Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of epdm o ring in China. The company has world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale custom made epdm o ring from our factory.
EPDM O Rings
EPDM O rings provide reliable sealing for water systems, HVAC equipment, pumps, valves, and industrial applications requiring resistance to moisture, weathering, and many water-based fluids. Custom sizes, hardness, and material formulations help meet specific operating conditions and sealing requirements.
EPDM O Ring Specifications
|
Parameter |
Typical Reference |
|
Material |
EPDM (Ethylene Propylene Diene Monomer Rubber) |
|
Operating Temperature |
−50°C to +150°C |
|
Short-Term Temperature Resistance |
Up to +180°C |
|
Hardness |
Shore A 40–90 |
|
Density |
0.85–1.30 g/cm³* |
|
Tensile Strength |
≥7 MPa |
|
Elongation at Break |
≥200% |
|
Compression Set |
20–30% typical reference range at 70°C × 22 h* |
|
Recommended Squeeze |
Static sealing: approximately 15–30%*; Dynamic sealing: approximately 10–20%* |
|
Low-Temperature Flexibility |
Down to −50°C* |
|
Volume Resistivity |
≥10¹⁵ Ω·cm |
|
Inner Diameter (ID) |
1–1,000 mm* |
|
Cross-Section Diameter (CS) |
1–20 mm* |
*Final Specification should be confirmed according to compound-specific hardness, mechanical properties, and compression-set limits.
Custom EPDM O Ring Manufacturing
We manufacture custom EPDM O rings based on your drawings, samples, sealing groove dimensions, and operating conditions.
Custom Sizes & Dimensions
We can produce EPDM O rings with customized:
- Inner diameter (ID) and cross-section diameter (CS)
- Dimensional tolerances
- Standard and non-standard sizes
- Dimensions matched to existing equipment and sealing grooves
EPDM Material & Hardness
EPDM compound and hardness can be selected according to:
- Operating temperature
- Water, coolant, or chemical contact
- Working pressure and extrusion risk
- Compression and compression set requirements
- Static or dynamic sealing conditions
Drawing / Sample Matching
You can provide:
- CAD or technical drawings
- Inner diameter, cross-section diameter, and tolerances
- Sealing groove dimensions and assembly requirements
- Material, hardness, and performance requirements
- Existing O ring samples or part numbers
We use these details to evaluate dimensional compatibility and identify a suitable EPDM specification for your application.
Sealing Groove Compatibility
We evaluate the O ring dimensions against your sealing design, including:
- Groove width, depth, and fill ratio
- Installation stretch and compression
- Mating clearance and extrusion risk
- Pressure direction and operating conditions
This helps reduce the risk of leakage, installation damage, and premature seal failure.
Sampling & Production
Samples can be evaluated against your approved specifications before bulk production. Depending on the application, validation may include:
- Dimensional and hardness inspection
- Visual defect inspection
- Compression set and material compatibility testing
- Pressure leakage or temperature testing, where required
Testing requirements can be defined according to your application and acceptance criteria.
OEM Customization
We can support customized EPDM O ring specifications according to your project requirements, including:
- Dimensions and tolerances
- EPDM compound and hardness
- Performance and testing requirements
- Packaging and labeling
- Part numbers and identification requirements
Provide your drawing or sample, target quantity, operating conditions, and required delivery schedule to discuss a suitable EPDM O ring solution.
EPDM O Ring Applications
EPDM O rings are used across a wide range of applications, with material compatibility, temperature resistance, and sealing performance selected according to the specific operating conditions of each system.
- Water & Hot Water Systems
- HVAC & Cooling Systems
- Pumps, Valves & Fluid Connections
- Pneumatic & Industrial Equipment
- Chemical Processing Equipment
EPDM O Ring Manufacturing Capability
Our scalable production capacity, in-house mold manufacturing, and multi-stage quality control help buyers maintain consistent product quality, reduce repeat-order risks, and secure a reliable supply for ongoing demand.
- Production Capacity: 20 production lines and up to 10 million rubber parts per month support volume orders and repeat supply.
- In-house Mold Manufacturing: 20,000+ molds and 40+ technicians support custom tooling and repeat-order consistency.
- Mold Precision: Mold accuracy up to ±0.01 mm supports dimensional consistency in custom rubber components.
- Quality Control: Inspection throughout material processing, molding, vulcanization, and finished-product stages helps maintain batch consistency.
- OEM/ODM Production: Custom manufacturing supports project-specific tooling, production requirements, and repeat orders.
EPDM O Ring Quality Control
-
Dimensional Inspection
ID, cross-section, and dimensional tolerances are checked against approved drawings, specifications, and applicable standards.
-
Hardness Testing
Rubber hardness is verified against the specified Shore A range to support sealing performance and material consistency.
-
Tensile Strength & Elongation Testing
Tensile strength and elongation at break are evaluated against specified material requirements to assess mechanical performance.
-
Compression Set Testing
Compression set is evaluated under defined temperature, duration, and compression conditions to assess the O ring`s ability to recover after compression.
-
Material Compatibility Verification
EPDM compatibility with the specified fluids, chemicals, and operating temperatures is reviewed to reduce the risk of swelling, degradation, and seal failure.
-
Visual Inspection
EPDM O rings are checked for cracks, flash, surface defects, cuts, and molding imperfections that may affect sealing integrity.
-
Batch Consistency Inspection
Production batches are checked against approved material and product specifications to help maintain consistent quality across repeat orders.
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.
B2B Ordering & Supply Support
Sample Lead Time: Samples are available in 3–15 days for specification verification before bulk production.
Bulk Production Lead Time: Standard orders typically require 10–30 days after order details and production requirements are confirmed.
MOQ: In-stock products have no MOQ; custom orders are discussed according to size, material, and production requirements.
Packaging & Shipping: Packaging can be arranged for bulk or OEM orders, with shipping options confirmed according to order quantity and destination.
Shipping & Delivery Terms: Available delivery terms include EXW, FOB, CFR, and CIF, allowing buyers to select arrangements based on destination, freight costs, and import requirements.
Quality Warranty: A 1-year quality guarantee covers manufacturing defects under normal usage conditions.
FAQ
Q: Can EPDM O rings be used with hydraulic fluids?
A: EPDM O rings are generally unsuitable for petroleum-based hydraulic oils, so fluid compatibility should be verified before selection.
Q: What causes EPDM O rings to swell or shrink?
A: Incompatible fluids, temperature changes, and compound selection can cause dimensional changes that compromise sealing performance.
Q: How do I prevent EPDM O ring leakage during installation?
A: Use the correct gland dimensions, avoid twisting or cutting the ring, and ensure the mating surfaces are clean and free of sharp edges.
Q: Can EPDM O rings be used for outdoor applications?
A: Yes, EPDM generally offers good resistance to ozone, UV exposure, and weathering, making it suitable for many outdoor sealing applications.
Q: What is the difference between EPDM and NBR O rings?
A: EPDM generally performs better in outdoor, water, and weather-exposed applications, while NBR is typically preferred for petroleum-based oils and fuels.
Q: How should EPDM O rings be stored before installation?
A: EPDM O rings in a cool, dry, dark environment away from direct sunlight, ozone sources, heat, and contact with incompatible chemicals.
Q: When should EPDM O rings be replaced?
A: Replace them when inspection reveals cracks, permanent deformation, swelling, hardening, or leakage, or when the specified maintenance interval is reached.
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