Custom Rubber O-Rings, Seals & Molded Parts
Hongjie manufactures rubber O-rings, seals, gaskets, washers, grommets, and custom molded rubber parts for automotive, medical, fluid-handling, and industrial applications, using 3,500+ standard profiles and existing tooling for established sizes or geometries, with custom molding for drawings, samples, and application-specific requirements.
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Products
Featured Products
Custom-molded O-rings, gaskets, and seals manufactured to IATF 16949 & ISO standards. Delivering high-reliability components for automotive, medical, and industrial applications.
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Custom O-Rings & Rubber SealsWaterproof Rubber Seals -
Custom O-Rings & Rubber SealsO-Rings for Valves -
Custom Rubber PartsSilicone Rubber Gaskets -
Custom Rubber PartsCustom Rubber Bushings -
Custom Rubber PartsRubber Parts for Plumbing Systems -
Custom O-Rings & Rubber SealsPlumbing O-Rings -
Custom O-Rings & Rubber SealsOil Resistant O-Rings -
Custom Rubber PartsNeoprene Rubber Parts -
Custom Rubber PartsNeoprene Gaskets -
Custom Rubber PartsCustom NBR Rubber Parts -
Custom O-Rings & Rubber SealsNBR Rubber O-Rings -
Custom Rubber PartsNBR / Nitrile Rubber Gaskets
Can't Find Your Specific Seal?
Don't settle for "near-fit." Our engineering team specializes in rapid custom-molding for unique technical requirements. Submit your specs for a 24-hour evaluation.
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Selection Guide
How to Find the Right Rubber Sealing Product
Selecting a rubber component involves more than matching its dimensions. Engineers and procurement teams should confirm how the part will operate, what it will contact and which quality requirements apply before choosing a profile or compound.
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Is the Application Static or Dynamic?
Static seals are used between fixed surfaces, while dynamic seals must withstand rotary or reciprocating movement. This affects the seal profile, material hardness, groove design and lubrication requirements.
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What Media Will Contact the Seal?
Identify the oils, water, fuels, gases, chemicals or cleaning agents that may contact the part. NBR, EPDM and FKM each provide different levels of resistance, so material compatibility should be confirmed for the actual application.
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What Are the Operating Conditions?
Temperature, pressure, movement, compression, outdoor exposure and required service life all influence the choice of material, hardness, tolerance and seal geometry.
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Is a Standard or Custom Part Required?
Standard profiles may reduce tooling costs and sample time, while custom molded parts are better suited to special dimensions, complex shapes or application-specific performance requirements.
MATERIAL OPTIONS
Common Rubber Materials for Sealing Applications
Material selection should be based on the complete operating environment rather than a single property.
| Material Options | |
|---|---|
| NBR | A cost-effective material with good resistance to many petroleum-based oils and hydraulic fluids. Commonly used for general industrial O-rings, oil seals and hydraulic components. |
| FKM | Selected for higher temperatures and strong resistance to many oils, fuels and chemicals. Frequently used in automotive, chemical-processing and energy-related applications. |
| EPDM | Offers good resistance to water, steam, ozone and outdoor weathering. Common applications include water systems, HVAC equipment, outdoor machinery and weather-exposed seals. |
| Silicone | Provides flexibility across a broad temperature range and is available in compounds suited to cleanliness-sensitive applications. Often used for medical equipment, food-processing equipment, electronics and soft molded components. |
| HNBR | Provides improved heat, oil, wear and mechanical resistance compared with conventional NBR. It is commonly considered for demanding automotive systems, compressors, oilfield equipment and industrial machinery. |
QUALITY & COMPLIANCE
Manufacturing Standards You Can Verify
For OEM buyers, consistent sealing performance depends on controlled materials, repeatable production processes and inspection records—not only the final dimensions of the part.
- IATF 16949-Certified Production
Hongjie operates under an IATF 16949-certified quality management system supporting automotive-oriented process control, material traceability, production consistency and quality documentation across repeat orders. - Inspection Plans Based on Project Risk
Inspection requirements can be agreed according to the application, order quantity and acceptable risk level, with options including AQL 1.0, 0.65, 0.15 or C=0. Critical dimensions, appearance criteria and material properties should be confirmed before sample approval. - Documentation and PPAP Support
Depending on project requirements, Hongjie can provide or discuss material documentation, dimensional inspection reports, control plans, sample records and PPAP-related documents. Required documents and submission levels should be confirmed during quotation. - Material Compliance Review
Selected compounds and supporting documents can be reviewed against FDA, NSF, WRAS, REACH, RoHS or customer-specific requirements. Compliance applies to the specified material and documentation rather than automatically covering every product.
APPLICATION GUIDE
Tailored Sealing Solutions for Every Industry
Beyond standard catalog parts, we provide material-specific sealing expertise. Whether you face extreme temperatures, chemical exposure, or high-pressure environments, we have the right engineering solution for you.
6+
Major Industries
Served Worldwide
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Automotive & Transportation
O-rings, gaskets, grommets and molded rubber components for engines, fuel systems, transmissions, fluid connections, electrical assemblies and vibration-control applications.
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Healthcare & Medical Devices
Silicone seals, diaphragms, valves and custom molded parts for equipment requiring controlled materials, clean surfaces and application-specific documentation.
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Oil, Gas & Energy
Rubber sealing components for pumps, valves, compressors, connectors and equipment exposed to pressure, oils, fuels, elevated temperatures or demanding chemical environments.
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Industrial Equipment
Custom seals, washers, grommets and molded parts for machinery, automation equipment, pneumatic systems, hydraulic assemblies and general OEM production.
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Water & Fluid Systems
EPDM, silicone and other material options for filtration equipment, plumbing assemblies, pumps, valves and fluid-control systems.
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Agricultural & Outdoor Equipment
Weather-resistant seals, protective grommets, vibration-dampening parts and molded rubber components for outdoor machinery and equipment housings.
