Kaxite Sealing manufactures PTFE modified material by compounding virgin PTFE suspension resin with glass fiber, carbon, graphite, bronze, MoS₂, barium sulfate and other fillers. Looking for a PTFE compound that survives where standard virgin PTFE creeps, wears or deforms? The result is a family of high-performance PTFE grades with improved compressive strength, thermal conductivity, wear resistance and dimensional stability. With 15+ years of sealing manufacturing experience, in-house compounding and moulding, full batch traceability and export to 60+ countries, we help buyers select the right modified PTFE grade and cut total sealing cost — not just supply a material code.
PTFE modified material is made from PTFE suspension resin with proper fillers such as glass fiber, glass microsphere, graphite, barium sulfate (BaSO₄), carbon fiber, molybdenum disulfide (MoS₂), polyphenyl, argil, etc., in the process of molding or skiving. Pure PTFE offers excellent chemical resistance and low friction, but it also has relatively low mechanical strength, poor creep resistance and low thermal conductivity. By adding fillers, these properties can be significantly improved while keeping the material suitable for demanding sealing, bearing and anti-corrosion applications.
These compounds are widely used for mechanical seals, chemical anticorrosion components, chemical process vessel seals, machine tool guideways lubrication, bridge construction support sliders and various kinds of pipe sealing in high temperature and high corrosive conditions. If your application demands better wear life, higher load capacity or improved heat dissipation than virgin PTFE can offer, a modified grade is usually the correct choice.
See our full range of PTFE and PEEK seals for related products, or explore PTFE parts for custom machined components.
Choosing the right filler is the single most important buying decision. The table below summarises the most common modified PTFE grades, their key advantages and typical applications. We compound these grades in-house — see PTFE modified material for the full filler portfolio.
| Grade | Filler | Key Advantage | Typical Applications | Food / Pharma Grade |
|---|---|---|---|---|
| Glass fiber filled | Glass fiber | High stiffness, low creep, good dimensional stability | Static seals, structural parts, high-load flanges | No |
| Carbon filled | Carbon | Higher compressive strength, better wear and thermal conductivity | Hydraulic fittings, rotary shafts, valve seats | No |
| Graphite filled | Graphite | Low friction at high PV, good heat dissipation | Compressors, pumps, dynamic seals | No |
| Bronze filled | Bronze | Highest compressive strength and thermal conductivity | Heavy-duty hydraulics, high-pressure valves | No |
| MoS₂ filled | Molybdenum disulfide | Reduced friction, improved wear under high loads | Bearings, sliding components, guideways | No |
| BaSO₄ filled | Barium sulfate | Improved chemical resistance and dimensional stability | Chemical processing equipment, pipe seals | No |
| Glass microsphere filled | Glass microsphere | Lower density, reduced warpage, good surface finish | Precision parts, thin-wall components | No |
| Property | Unit | Value |
|---|---|---|
| Material | — | PTFE + Glass fiber / Carbon / Graphite / Bronze / MoS₂ / BaSO₄ |
| Temperature Range | °C | -200 to +260 |
| Pressure Range | MPa | 0–35 (dependent on grade & design) |
| Hardness | Shore D | 55–75 |
| Tensile Strength (min.) | MPa | 14–25 |
| Elongation (min.) | % | 40–80 |
| Compressibility | % | 40–70 |
| Recovery | % | ≥ 60 |
| Permanent Set | % | < 25 |
| Static Coefficient of Friction | — | 0.04–0.15 (filler dependent) |
| Color | — | White, black, grey, brown (custom colors on request) |
| Standard | — | ASTM D4894 / D4895, ISO 13000, GB/T 1190 |
Kaxite supplies PTFE modified material in multiple forms to suit different processing routes. Because we compound and mould in-house, we can also produce custom dimensions, filler contents and one-off sizes directly from your drawing or sample without excessive tooling cost.
| Form | Size Range | Typical Applications |
|---|---|---|
| Rod | Diameter 5–300 mm, length up to 2000 mm | Machined seals, bearings, bushings, valve seats |
| Tube | OD 10–500 mm, wall thickness 2–50 mm | Bushings, sleeves, guide rings, insulators |
| Sheet | Thickness 1–50 mm, width up to 1200 mm | Gaskets, sliding plates, bridge bearings, liners |
| Ring / Custom Part | To drawing or sample | Mechanical seals, chemical vessel seals, pipe seals |
This is the most common question we receive from purchasing teams. The answer depends on the load, temperature, motion type and chemical environment. The table below compares virgin PTFE with the most common modified grades.
| Property | Virgin PTFE | Glass fiber filled | Carbon / Graphite filled | Bronze filled |
|---|---|---|---|---|
| Chemical resistance | Excellent | Very good | Very good | Good |
| Compressive strength | Low | Medium–High | Medium–High | Very High |
| Creep resistance | Low | High | High | Very High |
| Thermal conductivity | Low | Medium | Medium–High | Very High |
| Wear resistance | Medium | Medium–High | High | High |
| Best sealing mode | Static, low load | Static, structural | Dynamic, high PV | Heavy-duty dynamic |
These modified materials are widely used in equipment exposed to aggressive chemicals, high temperature, high load or continuous sliding motion:
For B2B buyers, a material failure is far more expensive than the part itself. Our quality control process is built around preventing that risk:
We operate an ISO 9001 quality management system and have supplied sealing components to customers in more than 60 countries, including OEM and MRO distributors across Europe, North America, the Middle East and Southeast Asia. Learn more about our factory and capabilities.
Kaxite Sealing offers a full custom service to meet your specific material requirements:
| Item | Details |
|---|---|
| MOQ | 50 kg per grade (standard); sample orders accepted for evaluation |
| Sampling | Free samples for standard grades; buyer covers courier cost, refundable against first bulk order |
| Lead time | 7–15 days standard forms / 15–25 days custom sizes after order confirmation |
| Packaging | Inner PE bag → export carton → plywood pallet; private-label and size-kitted packaging available |
| Shipping | Express (DHL / FedEx / UPS), air freight, sea freight, or buyer's forwarder |
| Incoterms | EXW, FOB Ningbo / Shanghai, CIF, DDP on request |
| Payment | T/T, L/C at sight, Western Union, PayPal for samples |
| Documents | Commercial invoice, packing list, B/L or AWB, certificate of origin, material and inspection reports |
Explore our full sealing products catalogue, compare complementary products such as PTFE rod, PTFE tube, PTFE ball, PTFE hose, PTFE fiber, PTFE film and PTFE parts, or contact our sales team directly.
PTFE modified material is a compounded polytetrafluoroethylene produced by mixing virgin PTFE suspension resin with fillers such as glass fiber, carbon, graphite, bronze, MoS₂ or BaSO₄. The filler improves specific mechanical, thermal or tribological properties while retaining most of PTFE's chemical inertness and wide temperature range.
Common fillers include glass fiber, carbon, graphite, bronze, MoS₂, BaSO₄ and glass microsphere. Glass fiber improves stiffness and creep resistance; carbon and graphite improve wear and thermal conductivity; bronze gives the highest compressive strength and thermal conductivity. Tell us your load, speed, temperature and chemical environment and we will recommend the right grade.
We supply PTFE modified material as rod (diameter 5–300 mm), tube (OD 10–500 mm), sheet (thickness 1–50 mm) and fully machined custom parts. Non-standard sizes can be produced to drawings or samples, normally without excessive tooling charges.
Filled grades are generally not recommended for food, pharmaceutical or high-purity chemical contact. For these industries, specify virgin PTFE with FDA or USP Class VI documentation. We can supply virgin PTFE grades that meet these requirements.
Virgin PTFE offers the best chemical resistance, lowest friction and highest purity, but lower mechanical strength and creep resistance. Modified PTFE grades trade a small amount of chemical resistance and purity for much better compressive strength, creep resistance, thermal conductivity and wear performance.
We control raw material batches, keep full batch traceability from resin to finished part, compound and mould in-house, inspect density, hardness, tensile strength and dimensions against ASTM D4894 / D4895, ISO 13000 or GB/T 1190, and carry out AQL-based pre-shipment sampling with an inspection report supplied with the goods.
Yes. We offer laser marking, custom labels, poly-bagging by size and full private-label packaging with your brand and part numbers. MOQ for private-label packaging starts at 200 kg per grade.
Standard MOQ is 50 kg per grade, with lower trial quantities accepted for first orders. Standard forms ship in 7–15 days; custom sizes take 15–25 days after order confirmation.
Send us your application details, media, temperature, load and required form — our engineers will confirm the correct grade, dimensions and price within 12 hours on business days.
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No. 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
