KS-PTFE-M · Compression Molded
Kaxite Sealing manufactures compression-molded PTFE sheet from 100% virgin PTFE resin, sintered to full density and stress-relieved for isotropic properties in all directions. Unlike skived sheet, molded sheet resists creep, machines predictably and holds tight tolerances when you are cutting thick gaskets, thrust washers, insulators or wear pads. We supply standard stock 1.5–50 mm thick in sheet sizes up to 1500 × 1500 mm, plus custom dimensions and CNC-finished parts to drawing. Procurement teams choose us for factory-direct bulk pricing, documented traceability and 7–15 day lead times.
Compression molding followed by free sintering gives a homogeneous sheet with the same mechanical properties along the length, width and thickness. That matters most when you are cutting thick parts under multi-axial stress — thrust washers, bearing pads and heavy-duty gaskets — where skived sheet can delaminate or fail preferentially in one direction.
After sintering, every molded sheet is slow-cooled in a controlled cycle to relieve internal stresses. The result is a low-warp, low-shrink sheet that stays flat through machining and holds tight tolerances even in the 20–50 mm thick range where skived sheet is not economically viable.
Resin sourcing, molding, sintering, skiving and CNC machining all run inside our Ningbo plant. No trading layer, so your PTFE molded sheet price stays stable even on repeat bulk orders. Annual volume discounts available for OEM and distribution partners.
Compression molded from 100% virgin PTFE resin and sintered to full density. Homogeneous, stress-relieved structure with high tensile strength and specific gravity 2.15–2.20 g/cm³. Available in virgin white and filled grades (15/25% glass, carbon-graphite, bronze, MoS₂) for reduced creep, improved wear or greater thermal conductivity. Custom sheet sizes and machined parts to drawing on request.
View full specifications| Property | Test Method | Typical Value | Unit |
|---|---|---|---|
| Tensile Strength | ASTM D638 | 25 – 35 | MPa |
| Elongation at Break | ASTM D638 | 300 – 500 | % |
| Compressive Strength | ASTM D695 | 12 | MPa |
| Coefficient of Friction (static) | ASTM D1894 | 0.04 – 0.08 | — |
| Continuous Service Temperature | — | -200 to +260 | °C |
| Thermal Conductivity | ASTM C177 | 0.25 | W/m·K |
| Dielectric Strength | ASTM D149 | 60 | kV/mm |
| Volume Resistivity | ASTM D257 | > 10¹⁸ | Ω·cm |
| Water Absorption | ASTM D570 | < 0.01 | % |
Die-cut into pure PTFE gaskets and envelope gaskets for aggressive chemical, oil & gas and pharmaceutical flanges.
Chute, hopper and tray liners in food processing and packaging where non-stick release and easy cleaning matter.
Barriers, spacers and insulating washers for high-voltage and high-frequency equipment thanks to >60 kV/mm dielectric strength.
Filled grades machined into bridge bearings, wear strips and slide pads where low friction and long life are essential.
Finished bushings, thrust washers, valve seats and insulators to your drawings — see our PTFE sheets overview for related formats.
Tell us your sheet thickness, sheet size, grade and annual volume, or send a finished-part drawing. Our technical team confirms grade selection before quoting and works with you on cut-to-size layouts to reduce waste.
MOQ negotiable for trial and prototype orders. Free cut samples of standard thickness and grade available for machining evaluation.
7–15 days for standard stock; longer for non-standard sizes, filled grades or CNC-machined parts to drawing.
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 sheet is compression-molded in a die and sintered — its mechanical properties are isotropic (equal in all directions). Skived sheet is peeled from a large cylindrical billet — it can be made thinner and smoother but the properties can be slightly anisotropic. For multi-axial stress or thick sections, molded is the safer choice; for thin gauges under 3 mm, skived is generally more cost-effective. See our PTFE skived sheets category for the thin-gauge format.
Yes — PTFE machines easily with sharp high-speed steel or carbide tooling. Cut, drill, mill, turn and punch with standard plastic or soft-metal workshop equipment. Keep tools sharp to avoid tearing, and use coolant or compressed air to clear chips and prevent heat build-up. Detailed machining guidelines are supplied on request.
PTFE is virtually inert — resistant to concentrated sulfuric and nitric acid, aqua regia, strong bases and organic solvents. The only known exceptions are molten alkali metals (sodium, potassium) and a small number of highly reactive fluorinating compounds at elevated temperature and pressure. For normal industrial service, molded PTFE sheet is considered chemically inert.
Continuous service range is -200 to +260 °C. Short-term exposure up to +300 °C is possible but may cause some degradation. PTFE has a coefficient of thermal expansion roughly ten times that of steel, so fixed assemblies should be designed with allowance for expansion to avoid stress build-up.
Gasket thickness depends on flange surface finish, bolt load, internal pressure and expected flange deflection. For standard ANSI raised-face flanges, 1.5–3 mm is common. Thicker sheet (5–10 mm) is specified for uneven surfaces or where more compressibility is needed. For critical service, our engineers can recommend a value once you share operating conditions.
Yes. For mechanical duty we produce molded sheet with 15/25% glass fibre, carbon-graphite, bronze or MoS₂ fillers. Filled grades deliver improved creep resistance, higher compressive strength, better wear behaviour and, in the case of bronze, higher thermal conductivity. They are the recommended choice for bearing pads, piston rings and wear plates.
Store flat or properly supported in a cool, dry place away from direct sunlight and heat. Keep in original packaging until use to avoid contamination. Handle with clean gloves to prevent oil or dirt transfer, especially for electrical or high-purity applications. Under these conditions, shelf life is effectively unlimited.
Yes. We produce custom thicknesses, lengths and widths, and our in-house CNC department fabricates finished gaskets, thrust washers, bushings, insulators and complex parts to your drawings — reducing your lead time and eliminating scrap on your side. Send your drawing or specification for a quotation.
Send us your thickness, sheet size, 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.
