Manufacturing Capabilities
Compression molding, cryogenic trimming, and in-house toolmaking — all under one roof.
Company Overview
We are a vertically integrated O-ring manufacturer, not a trading company. Our facility handles compounding, mold fabrication, compression molding, flash removal, inspection, and packaging internally. This integration is what allows us to offer custom sizes with no mold fees, fast prototyping, and consistent quality.
Vertical integration means we control every variable that affects seal performance. When you order from us, your parts never leave our facility until they are fully inspected and certified. There are no third-party subcontractors introducing variability, no delays while waiting for outsourced tooling, and no quality gaps caused by fragmented responsibility. Our engineers can walk from the mixing room to the molding floor to the inspection station in minutes, identifying and resolving issues in real time rather than discovering them weeks later when a subcontractor delivers non-conforming parts.
Quality control is embedded in every process step, not applied as an afterthought at the end of the line. Incoming raw materials are verified against supplier certificates of analysis before release to production. Molding parameters are monitored continuously with alarms for temperature or pressure deviation. Cryogenic deflashing is performed with calibrated liquid nitrogen dosing to ensure consistent flash removal without damaging seal edges. Final inspection includes 100% visual screening plus statistical dimensional sampling with calibrated instruments. This layered approach ensures that defects are caught at the source, not after parts have been packaged and shipped.
Flexible manufacturing is another advantage of vertical integration. We can pivot quickly from high-volume standard sizes to single-piece custom prototypes without reconfiguring an external supply chain. Our in-house mold shop means that custom tooling can be produced in days rather than weeks. Our multi-press configuration allows us to allocate capacity dynamically between urgent prototype orders and scheduled production contracts. This flexibility is essential for customers who need both development support and production supply from a single, reliable source.
Our manufacturing philosophy is built on three principles: precision, consistency, and responsiveness. Precision means every part meets the dimensional tolerances specified by AS568, ISO 3601, or your custom drawing. Consistency means batch 100 performs identically to batch 1, with statistical process control data to prove it. Responsiveness means we can adapt our production schedule to accommodate your urgent requirements without compromising the quality of scheduled orders. These principles have guided our investment decisions for 20 years and continue to drive our operational priorities today.
Production Process
Material Mixing
Raw polymer, fillers, curatives, and accelerators are weighed and mixed on internal mixers and two-roll mills to precise compound recipes. Each batch is assigned a unique lot number at the mixing stage, establishing the foundation of our traceability system. Mixing parameters including time, temperature, and shear rate are controlled to ensure homogeneous dispersion of ingredients, which is critical for consistent cure behavior and final physical properties. After mixing, the compound is sheeted, inspected visually for homogeneity, and sampled for hardness verification before being released to the molding department.
Compression Molding
Preforms are loaded into heated steel molds and cured under pressure in our compression molding presses. This is our primary molding method for NBR, FKM, EPDM, and Silicone, chosen for its excellent cavity fill, minimal flash, and superior material integrity compared to injection molding for many elastomer applications. Our press fleet ranges from 15 to 200 tons with both vacuum and non-vacuum configurations. Cure temperature, time, and pressure are monitored continuously for each batch, with automatic alarms for parameter deviation. Mold maintenance is performed on a scheduled basis to ensure cavity dimensions remain within tolerance throughout the production run.
Cryogenic Trimming
Flash is removed via cryogenic tumbling or precision auto-trim equipment, preserving seal edge integrity which is critical for dynamic seals. In cryogenic deflashing, parts are chilled with liquid nitrogen to embrittle the flash, then tumbled with media that fractures the flash away from the parting line without damaging the seal surface. This process achieves flash removal to microscopic levels that manual trimming cannot match, ensuring that dynamic seals perform reliably without flash-induced leakage or accelerated wear. For certain materials and geometries, precision auto-trim equipment provides an alternative with equally clean results.
100% Visual Inspection
Operators inspect each part for parting-line flash, voids, cracks, contamination, and dimensional anomalies before release. Inspection criteria are documented and based on established visual quality standards, with periodic inter-laboratory comparison to maintain consistency across operators and shifts. Critical applications receive enhanced inspection protocols including magnification and automated optical detection. Any part not meeting acceptance criteria is segregated immediately and counted in the batch nonconformance record. This 100% screening ensures that only visually acceptable parts proceed to final packaging.
Final QC & Packaging
Hardness and spot-check dimensions are recorded on the batch report. Parts are counted, bagged, labeled with batch and part number, and boxed for shipment. Packaging materials are selected based on part size and material compatibility—some elastomers require specific packaging to prevent ozone or UV degradation during transit and storage. The batch report is finalized with all inspection data, process parameters, and operator signatures, creating a complete manufacturing record that supports traceability and customer audit requirements. Labels include barcode tracking for customers who integrate our parts into their own traceability systems.
Equipment List
| Compression Molding Presses | 15-ton to 200-ton capacity, vacuum and non-vacuum configurations. Vacuum presses eliminate air trapping in complex cavity geometries, producing parts with superior surface finish and fewer internal voids. The press fleet is sized to handle everything from micro-seals with 1mm cross-sections to large-diameter flanged rings requiring multi-cavity tooling. |
| Cryogenic Deflashing System | Liquid nitrogen tumbling for clean, non-destructive flash removal. The system includes programmable temperature control, variable tumble speed, and media selection optimized for different materials and part geometries. Deflashing parameters are recorded per batch and correlated with visual inspection results for continuous process optimization. |
| CNC Mold Shop | In-house mold fabrication for AS568, ISO 3601, and custom profiles. Our toolroom machines hardened tool steel molds with tolerances of plus or minus 0.01mm, ensuring that finished parts meet specification from the first shot. Standard profile tooling is maintained in inventory, enabling immediate production for catalog sizes without tooling delays. |
| Shore A/D Hardness Testers | Calibrated digital durometers with certificate traceability to national standards. Hardness testing is performed on every production batch and on incoming raw material lots, providing early warning of compound variations that could affect sealing performance. Instruments are recalibrated annually and verified weekly with certified reference blocks. |
| 2D Measuring Systems | Digital optical and contact measurement for ID and CS verification with resolution to 0.01 millimeters. These systems enable rapid dimensional verification without part distortion, and measurement data is stored electronically for statistical process control analysis and customer dimensional reports. |
Capability Highlights
No Mold Fees (Standard Profiles)
For standard cross-sections, we absorb tooling costs. You only pay for the parts. This is possible because we have invested in maintaining an extensive inventory of standard mold tooling for AS568 and ISO 3601 profiles. When you order a standard size, we select the appropriate mold from our toolroom inventory and proceed directly to production. This eliminates the tooling cost barrier that prevents many engineers from ordering exactly the size they need, and it enables low-cost prototyping and small-batch orders that would be uneconomical with custom tooling charges.
Prototype to Production
First article samples in 3-5 days. Production ramp-up within 7-15 days standard lead time. Our in-house mold shop and flexible press scheduling allow us to move quickly from prototype validation to production volume. When your design is approved, we can maintain the same tooling and process parameters, ensuring that production parts match prototype performance exactly. This continuity eliminates the common problem of prototype parts performing well but production parts failing due to process or tooling changes between prototype and production suppliers.
Custom Cross-Sections
Any inner diameter by cross-section combination. We also manufacture square-cut rings, X-rings, and special profiles. Our CNC mold shop can produce tooling for unique geometries based on your drawing, sample, or dimensional specification. For non-standard profiles, we provide design for manufacturability feedback to optimize the part for molding and ensure that the finished seal performs reliably in your application. Custom profiles are common in OEM equipment where standard O-rings do not provide the required sealing performance or fit within the available groove space.
Small Batch Friendly
MOQ starts at 1 piece. Whether you need 10 pieces for R&D or 100,000 for production, the process is the same. Our production system does not penalize small orders with punitive pricing or reduced quality attention. Every order receives the same material verification, process monitoring, and inspection regardless of quantity. This makes us an ideal partner for development programs where frequent design iterations require small batches of different sizes and materials before the design is finalized for production.
Quality Control Gates
Incoming Material Inspection
All raw material shipments are received with supplier certificates of analysis and subjected to incoming inspection including visual review, hardness spot-check, and certificate verification. Non-conforming materials are rejected and returned to the supplier before they can enter production.
In-Process Monitoring
Molding parameters including temperature, pressure, and cure time are monitored continuously for each batch. Dimensional spot-checks are performed during production runs to detect drift before it produces out-of-specification parts. Process capability data is reviewed weekly.
Post-Process Verification
After deflashing, parts are subjected to 100% visual inspection against documented acceptance criteria. Hardness testing is performed on every batch, and dimensional inspection is performed on statistical samples. All data is recorded on the batch report.
Outgoing Release
Final batch review confirms that all inspection data is complete, all nonconformances have been dispositioned, and all customer documentation requirements have been met. Only after this review is the batch released for shipment with complete traceability records.
Custom Manufacturing Capabilities
Beyond catalog sizes, we manufacture custom O-rings and related sealing products in-house — from single-piece prototypes to production volumes. Compression molding covers standard and custom profiles; vulcanized splicing covers large diameters without mold tooling. Specify your drawing, sample, or operating conditions and we confirm process, lead time, and documentation.
Compression Molding — Custom Profiles
Custom inner diameter, cross section, and non-round profiles (square-cut, X-rings, D-rings) are molded in-house on CNC-fabricated tooling. Standard AS568 and ISO 3601 profiles use existing cavity inventory at no mold charge. Custom tooling is produced in our mold shop — first articles typically in 3–5 business days after drawing approval.
- ID range: 0.5 mm to 600 mm molded (larger via vulcanizing)
- Cross sections: 0.74 mm to 12.7 mm and custom
- Materials: NBR, HNBR, FKM, EPDM, VMQ, FFKM, PU, CR, AFLAS
- Typical cavity tolerance: ±0.01 mm on new tooling
Large-Diameter Vulcanizing & Cord Splicing
When inside diameter exceeds practical molding limits or quantity is too low to justify large molds, rings are fabricated from extruded cord using hot vulcanized, cold-bonded, or butt-spliced joints. Hot vulcanized joints target 70–90% of parent cord strength — suitable for static flanges, manways, and pressure vessels.
- ID range: 50 mm to 3,000 mm standard; larger by arrangement
- Joint methods: hot vulcanized, cold bonded, butt spliced
- Materials: NBR, FKM, EPDM, VMQ, PTFE cord
- Optional 100% leak test on request
Precision Mold Fabrication
In-house CNC mold shop eliminates third-party tooling delays. Hardened tool steel cavities are maintained for active catalog sizes and produced for custom profiles. Mold maintenance is scheduled from SPC dimensional data to prevent cavity drift during long production runs.
- Standards supported: AS568, ISO 3601, DIN 3771, JIS B 2401, custom
- New custom tool lead time: typically 3–10 business days
- No mold fee on standard profile catalog sizes
Specialty Fabrication
PTFE backup rings, vulcanized cord kits, and bonded metal-elastomer assemblies are produced or sourced under the same quality system. Engineering review confirms gland fill, extrusion gap, and material compatibility before production release.
- Backup rings: virgin, glass-filled, and bronze-filled PTFE
- Bonded seals: metal washer with molded elastomer sealing ring
- ED profile seals for hydraulic port grooves per drawing
Production Capacity
Our facility operates multiple compression molding presses with combined annual capacity suitable for both prototype and high-volume production. We have managed annual contracts exceeding several million pieces for automotive and industrial customers while maintaining the flexibility to support single-piece prototype orders. Production capacity is allocated dynamically based on order urgency, contract commitments, and scheduled delivery programs.
Process Capabilities
| Process | Capability Range | Typical Tolerance |
|---|---|---|
| Compression Molding | 15–200 ton presses, vacuum and standard configurations | ±0.05 mm typical, ±0.02 mm precision grade |
| Cryogenic Deflashing | NBR, FKM, EPDM, VMQ, FFKM, PTFE | Flash removal to <0.05 mm residual height |
| CNC Mold Fabrication | AS568, ISO 3601, DIN 3771, JIS B 2401, custom profiles | Cavity tolerance ±0.01 mm, surface finish Ra 0.4 µm |
| Large-Diameter Vulcanizing | ID 50 mm to 2,000 mm via precision cord joining | Joint strength >80% of parent material, 100% leak test available |
| Material Compounding | NBR, HNBR, FKM, EPDM, VMQ, PTFE, FFKM, PU, CR, AFLAS | Hardness ±3 Shore A batch-to-batch, color ΔE <1.5 |
Quality Control Flow
Incoming Material
Verify supplier COA, spot-check hardness, visual inspection for contamination
Mixing
Assign batch number, verify homogeneity, confirm hardness within spec
Molding
Monitor temperature/pressure continuously, in-process dimensional checks
Deflashing
Visual inspection for flash residue, verify edge integrity
Final Inspection
100% visual screening, batch hardness test, statistical dimensional sampling
Release
Review batch report, confirm documentation completeness, verify traceability chain
Material Batch Traceability
Every O-ring we manufacture is traceable through four linked levels: raw material supplier, compound batch, molding batch, and finished part packaging. This closed-loop system enables root-cause investigation within hours if a quality issue arises.
Raw Material
Supplier COA, incoming lot number, inspection data, storage location
Compound Batch
Mixing parameters, batch ID, operator, hardness verification, release time
Molding Batch
Press number, cure temperature/time/pressure, mold cavity ID, operator shift
Finished Part
Deflashing batch, inspection operator, packaging date, shipping lot number
Common Defects & Control Measures
Parting Line Flash
Cause: Excess preform weight, worn mold parting surface, or insufficient clamping
Control: Preform weight control per cavity, scheduled mold maintenance, cryogenic deflashing verification
Voids / Blisters
Cause: Trapped air, insufficient cure pressure, contaminated compound, or moisture
Control: Vacuum pressing for critical parts, mold venting maintenance, incoming material screening, desiccant storage
Dimensional Out-of-Spec
Cause: Mold wear, temperature drift, inconsistent preform weight, or compound variation
Control: Scheduled mold dimensional checks, SPC charting, automated temperature alarms, preform weight verification
Compression Set Failure
Cause: Over-cure, wrong compound for temperature, excessive operating heat, or groove over-compression
Control: Cure validation per ASTM D395, material-application review, groove design verification with customer
Frequently Asked Questions
What molding process do you use?
Compression molding is our primary process for O-rings. It provides excellent cavity fill, tight flash control, and is cost-effective for both small and large production runs. Unlike injection molding, compression molding does not subject the material to the high shear rates that can degrade polymer chains and reduce material properties. This makes it particularly suitable for high-performance elastomers like FKM and FFKM where material integrity is critical. Our press fleet includes both vacuum and non-vacuum configurations, with vacuum presses preferred for complex geometries and critical applications where internal voids cannot be tolerated.
Do you make your own molds?
Yes. Our in-house mold shop machines tooling for standard AS568 and ISO 3601 sizes as well as custom profiles. This eliminates third-party tooling delays and hidden costs that are common when mold fabrication is outsourced. Our toolroom is equipped with CNC machining centers capable of producing hardened tool steel molds with tolerances of plus or minus 0.01mm. Standard profile tooling is maintained in inventory, enabling immediate production for catalog sizes. For custom profiles, we can typically produce tooling and deliver first-article samples within 3-5 days, compared to 3-6 weeks typical for outsourced mold making.
Can you manufacture non-standard sizes?
Yes. We can produce any inner diameter and cross-section combination. For custom profiles, we machine the mold in-house and typically deliver samples within one week. Our capabilities extend beyond round O-rings to square-cut rings, X-rings, D-rings, and customer-specific geometries. We also manufacture large-diameter rings that exceed standard catalog limits, as well as micro-seals with cross-sections as small as 1mm. When you submit a custom requirement, our engineering team reviews the design for manufacturability and may suggest modifications to improve molding yield or seal performance.
What is your typical lead time?
Standard lead time is 7-15 days from order confirmation to shipment. Express prototyping is available in 3-5 days for urgent validation work. Lead time depends on material availability, tooling status, and current production schedule. For standard catalog sizes with tooling in inventory and material in stock, lead times are typically at the shorter end of the range. For custom sizes requiring new tooling or specialized materials requiring procurement, lead times may extend toward the longer end. We provide firm lead time commitments at order confirmation and notify customers immediately if any factors change.
How do you control flash on molded O-rings?
Flash control begins at the mold design stage with precision-machined parting lines and appropriate venting. During molding, press pressure and preform weight are optimized to achieve complete cavity fill with minimal flash. After molding, flash is removed through cryogenic tumbling where liquid nitrogen embrittles the flash for clean removal without damaging the seal edge. This multi-stage approach produces parts with flash levels that meet or exceed industry standards for both static and dynamic sealing applications.
What materials can you mold in-house?
We mold NBR, HNBR, FKM, EPDM, VMQ (Silicone), PTFE, and FFKM compounds in-house. Each material family includes multiple hardness grades and specialized formulations for specific applications such as food contact, high temperature, or chemical resistance. Our mixing and molding processes are optimized for each material type to achieve the best combination of physical properties and dimensional accuracy. We do not subcontract molding to third parties, ensuring complete control over quality and traceability.
How do you ensure dimensional consistency across large production runs?
Dimensional consistency is achieved through controlled molding parameters, preventive mold maintenance, and statistical process control. Cure temperature and pressure are monitored continuously, with automatic alarms for deviation. Mold cavities are inspected and maintained on a scheduled basis to prevent dimensional drift caused by wear. During production, spot-check dimensions are measured at defined intervals and plotted on control charts. If trends indicate approaching specification limits, production is paused for investigation before out-of-specification parts are produced.
Can you accommodate urgent orders or production interruptions?
Yes. Our flexible production scheduling allows us to accommodate urgent orders by prioritizing them through available press capacity. For customers with recurring requirements, we offer scheduled delivery programs and safety stock arrangements that buffer against demand spikes or supply chain disruptions. Express production and shipping options can deliver parts in 3-5 days for critical situations. We recommend discussing your consumption patterns with our team so we can design a supply strategy that balances cost, availability, and risk mitigation.
What documentation do you provide with manufactured parts?
Standard documentation includes a material test certificate confirming compound identity and hardness. Additional documentation available on request includes dimensional inspection reports, certificates of conformity, REACH declarations, RoHS declarations, FDA compliance letters, USP Class VI reports, and complete lot traceability records. For PPAP or first article requirements, we provide formatted documentation packages including dimensional results, material reports, process flow diagrams, and control plans.
Do you offer design for manufacturability feedback on custom parts?
Yes. When you submit a drawing or sample for custom manufacturing, our engineering team reviews the design for manufacturability and may suggest modifications to improve molding yield, reduce cost, or enhance seal performance. Common recommendations include adjusting corner radii, modifying groove geometry, or selecting alternative materials that provide equivalent performance at lower cost. This collaborative approach ensures that the parts you receive not only meet your drawing but also perform reliably in your application.
See Our Capabilities in Action
Request samples or schedule a virtual factory tour.