- Custom cast polyurethane O rings for high-wear sealing applications.
- Low compression set and long cycle life for dynamic seals.
- Food‑grade and anti‑static urethane O ring options available.
- Competitive pricing, fast samples, and global agent support.
- Free samples and low MOQ for testing and ordering.
INDUSTRIES SERVED: Automotive , Industrial Equipment, Electronics, Oil and Gas Industry
We are a China manufacturer and supplier of molded polyurethane O rings, offering custom cast urethane seals with tight tolerances and proven durability. Our production combines precision molds, controlled curing, and quality testing so PU O rings deliver superior abrasion resistance, low compression set, and reliable sealing under dynamic loads.
Our urethane o rings serve hydraulic and pneumatic systems, industrial pumps, food processing equipment, packaging machines, automotive assemblies, semiconductor tooling, and bottling lines. They excel in sealing fluids, gases, and contaminants, adapting to both standard and custom equipment requirements across sectors.
| Customization Parameters | Available Options | Recommended Use |
|---|---|---|
| Inner Diameter (ID) | 1mm – 500mm (custom sizes) | PU o rings for hydraulic cylinder precise fitting |
| Cross-Section (CS) | 0.5mm – 20mm | Urethane o rings for small electronic device sealing |
| Durometer (Shore A) | 50A – 95A | Polyurethane o rings for high-friction industrial machinery |
| Material Grade | Polyether, Polyester, Food-Grade, High-Temp | Chemical-resistant urethane o rings for solvent handling; FDA-compliant PU o rings for food processing |
| Seal Type | Static, Dynamic, High-Pressure | Dynamic polyurethane o rings for pneumatic piston rods |
| Certifications | FDA, REACH, RoHS | Food-grade PU o rings for beverage production lines |
| Temperature Range | -40°C to +120°C (grade dependent) | PU O rings for compressor and pump operating ranges. Heat-resistance grade for automotive engine compartments or off-road equipment in extreme climates |
- Automotive hydraulic and transmission systems.
- Food processing equipment sanitary sealing.
- Industrial pneumatic and hydraulic machinery.
- Medical device sterile fluid containment.
- Electronic equipment moisture/waterproofing.
- Marine hydraulic systems corrosion resistance.
- Packaging and bottling equipment seals.
- Automotive transmission and fuel system seals.
- Semiconductor handling and cleanroom seals.
- Superior abrasion resistance, significantly outperforming standard rubber materials for longer service life.
- Excellent load-bearing capacity and high tensile strength, handling extreme pressure without extrusion.
- Good resistance to oil, grease, and ozone, ensuring stability in challenging industrial environments.
- Maintain flexibility and sealing force across a wide range of operating temperatures.
- Can be custom-cast to achieve specific physical properties not available in off-the-shelf products.
- Cost advantage: Competitive pricing from China manufacturer with bulk discounts.
- Parameter edge: Higher abrasion resistance vs. standard rubber/competitor urethane o rings.
- Sample policy: Free prototype samples to test equipment compatibility.
- Low MOQ: Starts at 50 units, suitable for small-scale repairs or trials.
- After-sales service: 6-month warranty + 24-hour technical support for installations.
- Engineering support: assist with material selection and ring design.
- Hydraulic Equipment Manufacturer: A European client replaced rubber o rings with our custom cast polyurethane o rings. Reduced leak-related downtime by 70% and extended replacement intervals from 3 to 9 months, cutting maintenance costs by 45%.
- Food Processing Plant: Our FDA-compliant PU o rings solved sanitization issues for a U.S. facility. The non-toxic, easy-to-clean design met strict food safety standards and eliminated contamination risks from degraded rings.
- Identify operating temperature, pressure, and media compatibility first.
- Determine static vs. dynamic application to select appropriate hardness.
- Specify ID and cross‑section with tolerance requirements.
- Request material datasheets, test reports, and performance parameters.
- Order samples for in‑situ wear and leakage testing.
- Compare price versus expected lifetime for total cost of ownership.
Polyurethane O rings offer vastly superior abrasion resistance, higher tensile strength, and better performance under high-pressure conditions. While Nitrile has excellent oil resistance, urethane O rings are the preferred choice for applications involving heavy wear and tear.
es, we encourage it. We have a sample policy to provide qualified potential clients with free samples. This allows you to verify the dimensions, performance, and suitability for your application.
What information do you need to quote polyurethane O rings? A: Provide ID, cross section, material grade, operating temperature, pressure, and application details.
Yes, bonded polyurethane O rings with stainless or plated inserts are available.
Yes. We are manufacturer. Welcome to visit our factory.
Yes. The process includes Share needs → design & quote → prototype (opt) → production → delivery.
We have 10 inspectors to carry out raw material inspection, process control ,first article inspection and final inspection.
We use the ERP system to execute orders, and can check the order status and expected delivery time at any time.
All of products with 3-6 months guarantee (except very frequently wearing parts).
We will response in 24 hours with solutions such as replacement or reworking.
We have dedicated personnel to sort out and maintain molds regularly.
20,000 times for compressions molds and 30,000 time for casting molds
Due to the large quantity of molds, we can keep the molds for free for 2 to 3 years even if no order.
Customers only need to pay mold cost once. We will cover the cost if molds are damaged or reach the lifespan.
