NBR FKM EPDM Silicone Neoperene HNBR Round Square Oval Flat Rubber Sealing Ring Flange Gasket Part Rubber Seal Washer

Material Processing and Application Suitability

The performance of a rubber seal is fundamentally determined by the elastomer compound used. We process a variety of materials, each selected for specific operational environments:

NBR (Nitrile Butadiene Rubber): NBR is our standard material for applications requiring resistance to petroleum-based oils, fuels, and hydraulic fluids. It operates effectively in continuous temperatures ranging from -40°C to +120°C. It is widely used in automotive, hydraulic, and general industrial sealing.

FKM (Fluoroelastomer / Viton): For applications involving aggressive chemicals, high temperatures, or extreme pressure, we process FKM compounds. FKM maintains sealing integrity from -20°C to +200°C and offers superior resistance to acids, bases, and chlorinated hydrocarbons.

EPDM (Ethylene Propylene Diene Monomer): EPDM is specified for outdoor and water-based environments. It exhibits excellent resistance to weathering, ozone, UV exposure, steam, and hot/cold water. Its typical operating range is -40°C to +130°C.

Silicone (VMQ): Silicone is utilized for extreme temperature applications (-60°C to +200°C) where high dielectric strength and food-grade compliance are required. It is commonly used in medical, food processing, and aerospace applications.

Neoprene (CR): Neoprene offers a balanced profile of moderate oil resistance, good weather resistance, and flame retardancy. It is frequently used in HVAC, marine, and general-purpose sealing applications.

HNBR (Hydrogenated Nitrile): HNBR provides enhanced thermal and chemical resistance compared to standard NBR, with an extended temperature range up to +150°C. It is specified for demanding automotive and oilfield applications requiring superior dynamic performance.

Manufacturing Processes: Molding and Extrusion

We manufacture sealing components using two primary methods based on geometry and volume:

Compression and Transfer Molding: Used for round O-rings, square rings, oval seals, and custom-shaped gaskets. Molding allows for precise control over cross-sectional dimensions and the integration of complex geometries. Tooling is designed to minimize flash on sealing surfaces, and post-molding deflashing is performed to ensure dimensional accuracy.

Extrusion: Flat washers, continuous gasket stock, and long-profile seals are produced through extrusion. Extruded profiles can be die-cut to specific lengths or spliced to form continuous loops. This method is cost-effective for high-volume standard profiles.

Dimensional Tolerances and Quality Verification

Sealing performance depends on precise dimensional control. We verify all critical dimensions using optical comparators, coordinate measuring machines (CMM), and custom functional gauges. Tolerances are maintained in accordance with industry standards (such as ISO 3601 for O-rings) or customer-specified requirements.

Material verification is conducted on a lot basis. Hardness (Shore A), specific gravity, and tensile strength are tested to confirm compound consistency. For critical applications, we perform compression set testing, fluid immersion tests, and thermal aging tests to validate that the material meets the specified performance criteria.

Design and Engineering Support

When specifying rubber seals and gaskets, engineers should consider:

Compression Ratio: Flat gaskets and O-rings require adequate compression to create a seal. Typical compression ratios range from 15% to 30%, depending on material and application.

Chemical Compatibility: The elastomer must be compatible with the media being sealed. We provide chemical resistance charts and can conduct immersion testing for verification.

Temperature and Pressure: Operating conditions must fall within the material's rated limits. For high-pressure applications, anti-extrusion rings or harder durometer compounds may be required.

Regulatory Compliance: We can supply compounds that meet FDA, NSF, UL, RoHS, and REACH requirements. Documentation is provided with production lots.

Production Documentation and Supply

Each production run is documented with material batch records, process parameter logs, and dimensional inspection reports. First article inspection (FAI) is performed for new tooling or design changes. We maintain preventive maintenance schedules for all tooling to ensure consistent part quality over the production life.

For customers with ongoing requirements, we offer scheduled release programs and consignment inventory to support continuous production.

Rubber seals and gaskets are engineered components whose reliability depends on correct material selection, precise manufacturing, and rigorous quality control. Our facility provides the technical capability and process discipline to produce sealing solutions that meet defined specifications consistently.