Kaxite Sealing manufactures extrusion PTFE rods (paste-extruded and ram-extruded Teflon® rods) from 100% virgin PTFE resin. Our extrusion line produces continuous, uniform round bar with tight diameter tolerances, longer standard lengths and consistent density — the raw material professional machine shops rely on to CNC seals, bushings, valve seats and insulators in volume. Procurement teams choose us for factory-direct bulk pricing, documented traceability and 7–15 day lead times.
Extruded rod is the economical choice for small and medium diameters. Continuous production keeps the same density and diameter tolerance down the whole length, so the parts you machine on day 1 and day 100 match exactly. This matters most when you are running hundreds of seals, valve seats or insulating rings per week.
Controlled paste extrusion and sintering gives uniform specific gravity 2.14–2.16 g/cm³ from end to end. No density drift, no mid-rod surprises when you machine the far end of a 1 m length.
Held to standard commercial tolerance on Ø3–50 mm and practical tolerance on Ø50–200 mm. Cuts first-operation setup time because the OD needs less cleanup than molded rod.
Virgin white, 15/25% glass, carbon-graphite, bronze and modified PTFE (TFM) — all available in extruded form for Ø5–50 mm. Matched grade to application, documented on the delivery note.
We cut to your exact length to reduce waste, or ship in coils for small diameters. Free short samples of standard grades for machinability and dimensional verification before you commit to a bulk order.
Precision paste-extruded virgin PTFE rod engineered as raw stock for high-volume CNC machining of seals, gaskets, valve seats, insulating rings and wear parts. Smooth surface, consistent OD, low ovality — the workhorse extruded grade for small and medium diameters.
Ram or paste extruded virgin PTFE round bar with a continuous uniform structure, long standard lengths and consistent diameter tolerance. Chemically inert across pH 0–14, self-lubricating and an excellent dielectric. More economical than molded rod across the full small and medium diameter range.
| Property | Typical Value | Test Method | What It Means |
|---|---|---|---|
| Material | Virgin PTFE (unfilled) | ASTM D1710 | Full chemical purity for food / pharma service |
| Standard Diameters | 3 – 200 mm (1/8" to 8") | — | Covers most machined seals and bushings |
| Standard Lengths | 900 mm, 1000 mm, coils for small Ø | — | Fewer joints, less waste per part |
| Specific Gravity | 2.14 – 2.20 g/cm³ | ASTM D792 | Consistent across the rod length |
| Tensile Strength | 25 – 35 MPa (3600 – 5000 psi) | ASTM D638 | Withstands handling and machining |
| Elongation at Break | 300% minimum | ASTM D638 | High ductility, resists tearing during turning |
| Melting Point | 327 °C (621 °F) | ASTM D4591 | No true melt — sintered polymer |
| Service Temperature | -200 to +250 °C | — | Cryogenic to process steam |
| Coefficient of Friction | 0.05 – 0.10 (dynamic) | ASTM D1894 | Self-lubricating, low wear |
| Dielectric Strength | > 45 kV/mm | ASTM D149 | Excellent electrical insulation |
| Water Absorption | < 0.01 % | ASTM D570 | Dimensionally stable in humid service |
Machined into V-rings, backup rings, flange gaskets, valve stem seals and O-rings for chemical, oil & gas and pharmaceutical service. Pair with PTFE gaskets from the same bulk order.
Low friction and wear resistance suit bearings, bushings and slide pads in food machinery, chemical pumps and textile equipment. Filled grades recommended for high PV duty.
Dielectric strength above 45 kV/mm makes extruded rod the material of choice for stand-offs, spacers and wire insulation in high-temperature or corrosive electrical environments.
Machined into lab equipment liners, pipe plugs, column packing supports and dip pipes where full pH 0–14 inertness is required. Often specified alongside PTFE tubes in the same installation.
Guide rails, wear strips and scraper blades. Virgin grades comply with FDA 21 CFR 177.1550 and can be supplied with USP Class VI certification on request.
Lightweight, chemically resistant and thermally stable across the full aerospace service envelope. Available in modified PTFE (TFM) for improved dimensional stability where tight tolerances matter.
MOQ negotiable for trial and prototype orders. Free short cut samples of standard grades available for machinability testing before bulk.
7–15 days for standard diameters and cut lengths; longer for non-standard diameters, custom compounds or machined parts.
FOB Ningbo / Shanghai, CIF and DDP available. T/T and L/C payment terms confirmed at quotation.
Inspection report with every shipment. FDA 21 CFR 177.1550, RoHS and REACH documentation with full resin-lot traceability.
Molded rod is compressed in a mold and then sintered, so it is generally limited in length and can have slight density variation between the two ends. Extruded rod is forced through a die as a continuous paste and then sintered, giving long uniform lengths with consistent diameter and density — hundreds of metres for small diameters. Choose extruded for long sections or when you need consistency across many parts from one bar; choose molded for large diameters above roughly 200 mm.
Virgin PTFE cold-flows under sustained pressure. For moderate-pressure static seals it performs well. For dynamic seals or high-pressure static service we recommend filled grades — glass, carbon or bronze — which significantly improve compressive strength and creep resistance. Our engineering team reviews your pressure, temperature and media before confirming the grade.
PTFE machines easily with sharp high-speed steel or carbide tooling. Use high cutting speeds and slow feed rates; keep tools sharp to avoid tearing or stretching; and use coolant or compressed air to clear chips and prevent heat build-up. For threading, coarse threads are more robust than fine threads. Detailed machining guidelines are supplied on request.
Continuous service is -200 °C to +250 °C. Thermal expansion is roughly ten times that of steel (10–12 × 10⁻⁵ /°C), so assemblies that see wide temperature swings must allow for dimensional change. PTFE does not truly melt — it softens above 260 °C, and prolonged exposure above 300 °C leads to degradation. Keep operating conditions inside the rated continuous range.
Yes. While we stock a wide range of standard diameters, our extrusion line supports non-standard diameters, cut-to-length supply to reduce your waste, and custom-compounded grades (bronze, MoS₂, graphite, or specific colours) for OEM applications. Send a drawing or a diameter/length list for a quotation.
For maximum chemical purity and dielectric strength, choose virgin PTFE. For improved mechanical strength and creep resistance, choose glass-filled. For better wear resistance, lower friction and improved thermal conductivity, choose carbon-filled. For the highest wear and load-bearing capability, choose bronze or stainless-steel filled. TFM modified PTFE is the right choice when dimensional stability under thermal cycling is the priority.
Yes. Precision fabrication is a core service. We CNC-turn and mill extruded PTFE rod into finished seals, bushings, thrust washers, valve seats and insulators to your drawings — reducing your lead time and eliminating material waste on your side. Send your drawing and we will quote the finished part.
Store horizontally on a flat, supportive surface in a cool dry place away from direct sunlight and heat. Keep the rod in its original protective packaging until you are ready to machine it. Avoid dropping or impacting the rod — virgin PTFE grades can be marked or dented. Under these conditions, the shelf life is effectively unlimited.
Send us your diameter, length, grade, annual volume or finished-part drawing. Our export team replies within 24 hours and confirms grade selection, lead time, packaging and documentation before you place a bulk order.
