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PTFE O-Ring
Kaxite Seals's PTFE O-Rings are made from virgin or filled PTFE for sealing applications that require chemical resistance, low friction, and stable performance from -200°C to +260°C. They are available in AS568 and custom sizes, with carbon-, glass-, bronze-, or graphite-filled PTFE compounds and FDA-compliant grades. Pressure resistance is up to 35 MPa depending on size, groove design, and backup ring. Typical applications include automotive, aerospace, chemical processing, food, medical, and semiconductor equipment.
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Product Description
Virgin & Filled PTFE · AS568 & Custom Sizes
PTFE O-Ring — High-Temperature, Chemical-Resistant Teflon O-Ring Manufacturer & Custom Seal Supplier
PTFE O-Ring (also called a Teflon O-Ring) is a circular sealing element made from polytetrafluoroethylene — a fluoropolymer with the lowest coefficient of friction of any solid material and near-universal chemical inertness. Kaxite Seals manufactures PTFE O-Rings in virgin and filled compounds (carbon, glass, bronze, graphite) for sealing applications where rubber elastomers such as NBR, FKM or EPDM would swell, harden or fail.
Standard operating range is -200°C to +260°C with pressure resistance up to 35 MPa depending on size, groove design and backup ring. Tensile strength is ≥ 16 MPa, hardness 70–90 JIS Hs, and compression set resistance is excellent for long service life. Available in AS568 standard sizes or fully custom dimensions, including FDA-compliant grades for food, pharmaceutical and medical equipment.
-200 ~ +260°C Temperature Range
0 – 35 MPa Pressure Resistance
≥ 16 MPa Tensile Strength
70–90 JIS Hs Hardness
AS568 + Custom Size Standards
Product Overview
What is a PTFE O-Ring and why is it used?
Direct answer: A PTFE O-Ring is a circular sealing element made from polytetrafluoroethylene (PTFE), also known as Teflon. It prevents leaks in static or dynamic applications by providing a chemically inert, low-friction sealing barrier across an extremely wide temperature range of -200°C to +260°C. Unlike rubber O-rings, PTFE O-rings do not swell or degrade in aggressive acids, solvents, fuels, steam or oxidizers, and they can operate at pressures up to 35 MPa when supported by a backup ring. They are specified wherever chemical resistance, thermal stability and purity matter more than elastomeric elasticity.
Superior Chemical Resistance
Withstands strong caustics, moderate acids, chlorine, gases, water, steam, hydrocarbons and hydrogen. Only elemental fluorine and molten alkali metals attack PTFE.
Wide Temperature Range
Continuous service from -200°C to +260°C (-328°F to +500°F) — far beyond the limits of NBR, EPDM or silicone rubber O-rings.
Lowest Friction of Any Solid
The non-stick PTFE surface reduces breakaway friction, lowers wear and cuts energy consumption in dynamic sealing applications.
High Purity & FDA Grades
FDA-compliant virgin PTFE grades are available for food, beverage, pharmaceutical and medical device applications with no extractables.
Multiple Filled Compounds
Virgin, carbon-filled, glass-filled, bronze-filled and graphite-filled PTFE options to balance chemical resistance, wear and mechanical strength.
Long Service Life
Excellent compression set resistance and dimensional stability keep sealing force stable over thousands of thermal and pressure cycles.
Specifications
What are the technical specifications of the PTFE O-Ring?
Direct answer: Kaxite PTFE O-Rings are manufactured from virgin or filled PTFE with hardness 70–90 JIS Hs, tensile strength ≥ 16 MPa, elongation at break ≥ 60%, compressibility 50–60% and recovery > 85%. The operating temperature range is -200°C to +260°C and the pressure range is 0–35 MPa. Standard cross-sections run from 1.80 mm to 16.00 mm with nominal inside diameters from 20 mm to 2000 mm, in AS568 or custom sizes.
| Property | Value |
|---|---|
| Product Name | PTFE O-Ring / Teflon O-Ring |
| Material | Virgin PTFE or filled PTFE (carbon, glass, bronze, graphite) |
| Temperature Range | -200°C to +260°C (-328°F to +500°F) |
| Pressure Range | 0 – 35 MPa (0 – 5,000 psi) |
| Hardness | 70–90 JIS Hs (60–75 JIS Hs for soft grade) |
| Tensile Strength | ≥ 16 MPa |
| Elongation at Break | ≥ 60% |
| Compressibility | 50–60% |
| Recovery | > 85% |
| Compression Set | < 10% (230°C × 24 h) / < 20% (175°C × 70 h) |
| Cross-Section Diameter | 1.80 mm – 16.00 mm |
| Nominal Inside Diameter | 20 mm – 2000 mm |
| Size Standard | AS568 (standard) and fully custom dimensions |
| Colours | White (virgin), black, red — custom colours on request |
| Chemical Resistance | Strong caustics, moderate acids, chlorine, gases, water, steam, hydrocarbons, hydrogen and aluminium fluoride — except elemental fluorine and molten sodium |
| Certification | ISO 9001 manufacturing; FDA-compliant grades available |
Data per Kaxite material datasheet. Non-nominal and compound-specific O-rings can be produced on request. Send your drawing or sample for a custom quotation.
Material Comparison
Virgin PTFE vs filled PTFE O-Rings — which compound should you choose?
Direct answer: Virgin PTFE gives the best chemical resistance, the lowest friction and the highest purity — choose it for aggressive chemicals and FDA/food applications. Filled PTFE compounds improve mechanical strength, wear resistance and thermal conductivity — choose carbon-filled for general dynamic sealing, glass-filled for dimensional stability, bronze-filled for the highest thermal conductivity and compressive strength, and graphite-filled for self-lubricating dry-running service. All grades retain the -200°C to +260°C operating range of the base polymer.
| PTFE Compound | Best For | Wear Resistance | Chemical Resistance | Typical Applications |
|---|---|---|---|---|
| Virgin PTFE | Maximum chemical inertness and purity | Moderate | Excellent | Food, pharma, medical, semiconductor, aggressive acids |
| Carbon-Filled PTFE | General-purpose dynamic sealing | High | Very good | Hydraulic and pneumatic O-rings, pumps, valves |
| Glass-Filled PTFE | Dimensional stability under load | High | Good | Static seals, chemical processing equipment |
| Bronze-Filled PTFE | Highest thermal conductivity and compressive strength | Very high | Good | High-load dynamic seals, hydraulic cylinders, presses |
| Graphite-Filled PTFE | Self-lubricating dry-running service | High | Very good | Dry-running compressors, high-speed rotating seals |
Data per Kaxite material datasheet. Kaxite's technical team will recommend the optimal compound based on your media, temperature, pressure and motion profile.
Applications
Where are PTFE O-Rings used?
Direct answer: PTFE O-Rings are used in automotive fuel and brake systems, aerospace hydraulic and pneumatic systems, chemical pumps, valves and reactors, food and beverage processing equipment, medical devices and analytical instruments, and semiconductor manufacturing equipment — anywhere a seal must survive aggressive media, extreme temperatures or high-purity requirements.
Automotive
Fuel systems, brake systems, engine components and sensors where resistance to fuels, oils and high under-hood temperatures is essential.
Aerospace
Hydraulic and pneumatic systems requiring reliable sealing across extreme temperature swings and aggressive aerospace fluids.
Chemical Processing
Chemical pumps, valves, reactors and analytical instruments where PTFE's near-universal chemical inertness prevents seal degradation.
Food & Beverage
Processing and filling equipment using FDA-compliant virgin PTFE O-rings with no extractables and no effect on product taste.
Medical & Analytical
Medical devices, laboratory instruments and diagnostic equipment that demand high purity, sterilisability and chemical resistance.
Semiconductor
Semiconductor manufacturing equipment where ultra-high-purity, low-particle PTFE seals protect wafer process integrity.
FAQ
Frequently asked questions about PTFE O-Rings
Q1What is a PTFE O-Ring?
A PTFE O-Ring is a circular sealing element made from polytetrafluoroethylene (PTFE), also known as Teflon. It is used to prevent leaks in static or dynamic applications, offering excellent chemical resistance and high-temperature performance from -200°C to +260°C.
Q2What temperature range can a PTFE O-Ring handle?
Standard PTFE O-Rings operate from -200°C to +260°C (-328°F to +500°F). For sustained service above +260°C, filled PTFE compounds or PEEK seals may be recommended. Kaxite's technical team can advise on the correct grade for your temperature profile.
Q3Are PTFE O-Rings suitable for high-pressure applications?
Yes. They withstand pressures up to 35 MPa (5,000 psi) depending on size, groove design and backing ring configuration. For extreme pressures, Kaxite recommends using a PTFE or PEEK backup ring to prevent extrusion of the O-ring into the clearance gap.
Q4What is the difference between virgin PTFE and filled PTFE O-Rings?
Virgin PTFE offers the best chemical resistance and the lowest friction. Filled PTFE (with glass, carbon, bronze or graphite) improves mechanical strength, wear resistance and thermal conductivity, making it suitable for higher pressure and dynamic applications.
Q5What sizes are available — AS568 or custom?
Kaxite supplies PTFE O-Rings in AS568 standard sizes as well as fully custom dimensions. Cross-sections range from 1.80 mm to 16.00 mm and nominal inside diameters from 20 mm to 2000 mm. Send your drawing or sample for a custom quotation.
Q6What chemicals are PTFE O-Rings resistant to?
PTFE O-Rings resist strong caustics, moderate acids, chlorine, gases, water, steam, hydrocarbons, hydrogen and aluminium fluoride. Only elemental fluorine and molten alkali metals (such as molten sodium) attack PTFE at service temperature.
Q7Are FDA-compliant PTFE O-Rings available?
Yes. Kaxite supplies FDA-compliant virgin PTFE O-Rings for food, beverage, pharmaceutical and medical device applications. These grades contain no extractable additives and do not affect product taste, odour or purity.
Q8Why choose PTFE instead of rubber (NBR, FKM, EPDM)?
Rubber elastomers swell, harden or crack in aggressive chemicals and cannot operate above roughly 200–230°C. PTFE is chemically inert to nearly all industrial media, operates from -200°C to +260°C, and has the lowest friction coefficient of any solid material — making it the preferred choice for aggressive or high-temperature sealing.
Q9Can Kaxite manufacture custom PTFE O-Rings?
Absolutely. Kaxite manufactures custom PTFE O-Rings to your exact specifications, including non-standard sizes, filled PTFE compounds, special tolerances and special colours. Send us your drawing or sample for a quick quote.
Q10What is the MOQ and lead time?
MOQ depends on O-ring size, compound and quantity. Sample lead time is typically 5–7 days. Production lead time for standard and custom orders is typically 15–25 days after order confirmation.
Why Kaxite
Why choose Kaxite Seals as your PTFE O-Ring manufacturer?
ISO 9001 Certified Manufacturing Ningbo Kaxite Sealing Materials Co., Ltd. combines advanced production technology with strict quality control across every batch.
Full Material Range Virgin, carbon-filled, glass-filled, bronze-filled and graphite-filled PTFE — plus FDA-compliant grades for sensitive applications.
OEM & Custom Engineering Custom sizes, cross-sections, tolerances and compounds manufactured to your drawing — with expert technical support for material selection.
Fast Delivery, Wholesale Pricing Competitive wholesale pricing, 5–7 day sample lead time and 15–25 day production lead time with comprehensive material certification.
Request a quote for PTFE O-Rings
Send us your O-ring size (inner diameter × cross-section), quantity, PTFE compound preference, and application details — including working temperature, pressure, media and whether the seal is static or dynamic. Kaxite's technical team will respond within 2 business hours with pricing and lead time. For custom sizes, include a drawing with all dimensions and tolerances.
Hot Tags: PTFE O-Ring, Teflon O-Ring Manufacturer, Custom High-Temperature Seals
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