PTFE O-Ring
Discover the Kaxite Sealing PTFE O-Ring, an exceptional sealing solution crafted for demanding industries like chemical processing and aerospace. Its PTFE material ensures superior resistance to extreme temperatures and corrosive fluids, providing unmatched durability and reliable performance. Ideal for engineers and professionals seeking enhanced safety and efficiency in their operations, this O-ring delivers peace of mind by preventing leaks and reducing downtime. Unlike conventional seals, Kaxite Sealing's innovative design offers a unique blend of flexibility and strength, setting a new standard in sealing technology. Experience the difference and elevate your projects with our high-quality guarantee.
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Product Description
Custom PTFE O-Ring Manufacturer & Supplier for Chemical, Pharmaceutical, and High-Purity Applications
As a professional PTFE O-ring manufacturer and supplier, Kaxite Sealing designs these seals for applications requiring exceptional chemical resistance, wide temperature tolerance, and low friction. Unlike standard elastomeric O-rings, our O-rings deliver reliable sealing performance in aggressive media, cryogenic environments, and high-purity processes where conventional rubber compounds would degrade or fail. Custom sizes and non-standard compounds are available on request.
Key Takeaways
- Chemical resistance: Resists nearly all industrial chemicals, acids, bases, and solvents, except molten alkali metals and elemental fluorine.
- Temperature range: -50°C to +250°C, depending on the selected PTFE compound.
- Pressure capability: Up to 35 MPa in static sealing applications.
- Compound options: Brown (A), black (B), and red (C) PTFE compounds for different temperature and mechanical requirements.
- Custom sizes: Standard section diameters from 1.80 mm to 6.00 mm, with nominal inside diameters from 20 mm to 2,000 mm. Non-standard compound O-rings are available on request.
Main Properties
Kaxite Sealing supplies PTFE O-rings in three standard compounds (A, B, and C) to suit different operating conditions. We can also produce non-standard compound O-rings to match specific chemical or temperature requirements. The table below summarizes the key physical and mechanical properties.
| Condition | Property | Unit | Type A (Brown) | Type B (Black) | Type C (Red) |
|---|---|---|---|---|---|
| Normal Conditions | Hardness | JIS Hs | 70-90 | 70-90 | 60-75 |
| Elongation, min. | % | 60 | 60 | 80 | |
| Tensile Strength, min. | MPa | 16 | 16 | 16 | |
| Compressibility | % | 50-60 | 50-60 | 60-75 | |
| Recovery | % | >85 | >85 | >70 | |
| Permanent Set | % | <10 | <10 | <20 | |
| 230°C × 24 h Hot Air Ageing | Change of Hardness, max. | JIS Hs | -5 to +5 | -5 to +5 | -5 to +5 |
| Change of Tensile Strength, max. | % | -15 | -15 | -15 | |
| Change of Elongation, max. | % | -20 | -20 | -20 | |
| Compression Permanent Set (175°C × 70 h) | Compression Permanent Set | % | ≤20 | ≤20 | ≤30 |
| Colour | Colour | — | Brown | Black | Red |
| Applications | Temperature Limits | °C | -20 to 250 | -20 to 200 | -50 to 200 |
| Pressure Limits | MPa | 0-35 | |||
| Strong caustics, moderate acids, chlorine, gases, water, steam, hydrocarbons, hydrogen, and aluminum fluoride — except elemental fluorine and molten sodium. | |||||
Specifications
Standard PTFE O-ring sizes cover section diameters from 1.80 mm to 6.00 mm and nominal inside diameters from 20 mm to 2,000 mm. The table below lists the standard dimensional ranges. Custom sizes and non-standard compounds are available on request.
| Section Diameter (mm) | Nominal Inside Diameter (mm) | Section Diameter (mm) | Nominal Inside Diameter (mm) |
|---|---|---|---|
| 1.80 ± 0.10 | 20 ± 0.10 to 300 ± 1.60 | 6.00 ± 0.13 | 80 ± 0.80 to 400 ± 2.00 |
| 2.60 ± 0.10 | 20 ± 0.15 to 300 ± 1.60 | 6.30 ± 0.14 | 80 ± 0.80 to 400 ± 2.00 |
| 3.55 ± 0.10 | 25 ± 0.15 to 300 ± 1.60 | 7.00 ± 0.14 | 100 ± 0.65 to 1,000 ± 4.00 |
| 4.00 ± 0.10 | 40 ± 0.20 to 300 ± 1.60 | 8.00 ± 0.16 | 110 ± 1.00 to 2,000 ± 4.00 |
| 4.60 ± 0.10 | 40 ± 0.20 to 300 ± 1.60 | 10.00 ± 0.18 | 200 ± 1.50 to 2,000 ± 6.00 |
| 5.00 ± 0.10 | 40 ± 0.25 to 400 ± 1.80 | 12.00 ± 0.18 | ≥400 ± 1.50 to 6.00 |
| 5.30 ± 0.13 | 60 ± 0.30 to 400 ± 1.80 | 14.00 ± 0.18 | ≥400 ± 1.50 to 6.00 |
| 5.50 ± 0.13 | 60 ± 0.30 to 400 ± 1.80 | 16.00 ± 0.18 | ≥400 ± 1.50 to 6.00 |
| 5.70 ± 0.13 | 60 ± 0.30 to 400 ± 2.00 | — | — |
Application Scenarios
Chemical Processing
The O-rings resist aggressive acids, bases, solvents, and corrosive media that degrade standard rubber seals. They are widely used in chemical pumps, valves, reactors, and transfer lines where chemical compatibility is critical. See our PTFE gaskets and PTFE machined parts for related chemical sealing solutions.
Pharmaceutical and Food Industry
With non-toxic, non-stick, and low-extraction properties, PTFE O-rings meet FDA and USP Class VI requirements. They are ideal for pharmaceutical reactors, food processing equipment, and sterile filling systems where contamination must be avoided. Explore our PTFE tubing for high-purity fluid handling.
Semiconductor and High-Purity Applications
The O-rings offer ultra-low extractables and excellent purity, making them suitable for wet benches, wafer cleaning, and high-purity gas delivery systems. They prevent contamination in sensitive semiconductor manufacturing processes. Pair them with our PTFE film for complete high-purity sealing systems.
Oil and Gas
The O-rings withstand hydrocarbons, sour gas, and high pressures up to 35 MPa. They are used in downhole tools, wellhead equipment, and refinery valves where chemical resistance and thermal stability are essential. See our PTFE rods for related high-pressure sealing components.
Cryogenic and Low-Temperature Systems
Type C (red) O-rings operate reliably down to -50°C, making them suitable for LNG, liquid nitrogen, and other cryogenic applications where standard elastomers become brittle.
Custom O-Ring Solutions
Kaxite Sealing produces non-standard compound O-rings and custom dimensions to match specific media, temperature, and pressure requirements.
Related PTFE Products
Kaxite Sealing also manufactures a full range of PTFE machined parts including PTFE rods, PTFE tubes, PTFE balls, PTFE film, and PTFE fiber for chemical, pharmaceutical, and food processing applications. For related sealing solutions, see our PTFE gaskets.
FAQs
Q: What makes the O-rings different from standard rubber O-rings?
A: PTFE O-rings offer near-universal chemical resistance and a wider temperature range than rubber O-rings. They also have lower friction, making them suitable for aggressive media, high-purity processes, and applications where rubber would swell or degrade.
Q: Which O-ring compound should I choose?
A: Type A (brown) and Type B (black) suit temperatures from -20°C to +250°C and +200°C respectively, with high recovery above 85%. Type C (red) handles lower temperatures down to -50°C but has lower recovery. Selection depends on your chemical media and temperature profile.
Q: Can O-rings be used in high-pressure applications?
A: Yes. Standard O-rings handle static pressures up to 35 MPa. For higher pressures, a back-up ring or a different seal design may be required.
Q: Do you offer custom sizes or non-standard compounds?
A: Yes. We produce non-standard compound O-rings and custom dimensions. Send your drawing, media, temperature, and pressure details for a same-day recommendation.
Need help selecting the right O-ring compound or size for your application? Our engineering team responds within one business day.
Hot Tags: PTFE O-Rings, Custom Seals Manufacturer, Bulk O-Rings Supplier
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