PTFE Sheet

PTFE Sheet, also known as Teflon® sheet or Polytetrafluoroethylene sheet, is a versatile, high-performance engineering plastic renowned for its exceptional chemical resistance, outstanding thermal stability, and remarkably low coefficient of friction. As a cornerstone material in demanding industrial applications, it provides reliable sealing, insulation, and non-stick solutions across countless sectors. At Kaxite Sealing, we manufacture premium-grade PTFE sheets that meet the highest standards of quality and consistency, engineered to deliver optimal performance in the most challenging environments. Our commitment at Kaxite Sealing is to provide not just a product, but a comprehensive sealing solution backed by decades of expertise. We understand that the right material specifications are critical to application success. Therefore, our PTFE sheets are available in various forms—including skived (calendered), molded, and filled—to suit specific mechanical, thermal, and chemical requirements. **Key Properties and Advantages of Kaxite Sealing PTFE Sheets:** * **Unmatched Chemical Resistance:** Inert to nearly all industrial chemicals and solvents, making it ideal for aggressive fluid handling. * **Extreme Temperature Tolerance:** Performs consistently from -200°C (-328°F) to +260°C (+500°F) with short-term tolerance even higher. * **Excellent Dielectric Strength:** A superb electrical insulator even in harsh conditions. * **Very Low Friction Coefficient:** Provides inherent lubricity, reducing wear and energy consumption in moving parts. * **Non-Stick and Non-Wetting:** Prevents adhesion of most materials, ensuring easy cleaning and release. * **High Purity and FDA Compliance:** Certain grades are suitable for food, pharmaceutical, and semiconductor applications. * **Zero Water Absorption:** Dimensions and properties remain stable in humid or wet environments. * **Excellent Weatherability and UV Resistance:** Maintains properties when exposed to outdoor elements. ### Detailed Product Specifications of Kaxite Sealing PTFE Sheets To ensure you select the perfect material for your project, we offer a comprehensive range of PTFE sheets with precise specifications. **Standard Material Grades & Types:** | Grade Type | Description | Key Characteristics | Typical Applications | | :--- | :--- | :--- | :--- | | **Virgin PTFE** | 100% pure, unfilled PTFE. | Highest purity, excellent chemical/electrical properties, lower mechanical strength. | Gaskets for ultra-pure systems, medical components, electrical insulation, labware. | | **Glass Filled PTFE** | Reinforced with glass fibers (5%-40%). | Improved compressive strength, reduced creep, better wear resistance. | Bushings, bearings, thrust washers, industrial gaskets under load. | | **Carbon Filled PTFE** | Filled with carbon/graphite powder. | Enhanced thermal conductivity, lower friction, superior wear resistance. | Piston rings, compressor rings, dynamic seals in dry/wet environments. | | **Bronze Filled PTFE** | Filled with bronze powder. | High load-bearing capacity, excellent thermal conductivity, very low wear. | Heavy-duty bearings, wear plates, backup rings for high-pressure seals. | | **Stainless Steel Filled** | Filled with stainless steel powder. | High stiffness, excellent wear resistance, good thermal conductivity. | Seals for abrasive media, chemical pump components, heavy-duty guides. | | **MoS2 (Moly) Filled** | Filled with molybdenum disulfide. | Reduced initial friction, improved break-in characteristics. | Seals and bearings for slow, high-load applications. | **Physical & Mechanical Property Table (Typical Values):** | Property | Test Method | Virgin PTFE | 25% Glass Filled | 20% Carbon Filled | 15% Bronze Filled | | :--- | :--- | :--- | :--- | :--- | :--- | | **Density (g/cm³)** | ASTM D792 | 2.15 - 2.20 | 2.20 - 2.30 | 2.10 - 2.20 | 3.00 - 3.10 | | **Tensile Strength (psi)** | ASTM D638 | 3,000 - 5,000 | 2,500 - 3,500 | 2,200 - 2,800 | 2,000 - 2,500 | | **Elongation at Break (%)** | ASTM D638 | 300 - 500 | 200 - 300 | 150 - 250 | 100 - 200 | | **Compressive Strength (psi)** | ASTM D695 | 1,800 | 3,500 | 3,200 | 4,000 | | **Coefficient of Friction (Dynamic)** | ASTM D1894 | 0.04 - 0.10 | 0.10 - 0.15 | 0.08 - 0.12 | 0.10 - 0.18 | | **Continuous Service Temp.** | — | -200°C to +260°C | -200°C to +260°C | -200°C to +260°C | -200°C to +260°C | **Standard Size & Thickness Availability from Kaxite Sealing:** Our PTFE sheets are produced to meet diverse fabrication needs. * **Sheet Dimensions:** Standard sheets are available in sizes up to 1500mm x 1500mm (59" x 59"). Custom sizes can be manufactured upon request. * **Thickness Range:** We supply sheets in a wide thickness spectrum: * Thin films/sheets: 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.8mm, 1.0mm * Standard sheets: 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm * Thick plates/blocks: 12mm, 15mm, 20mm, 25mm, 30mm, 50mm and above. * **Color Coding:** Virgin PTFE is typically white. Filled grades have characteristic colors (e.g., brown for carbon, tan for glass, metallic for bronze/steel) for easy identification. ### Frequently Asked Questions (FAQ) About PTFE Sheets **Q: What is the main difference between Virgin PTFE and filled PTFE sheets?** A: Virgin PTFE is the pure base polymer, offering the best chemical resistance and electrical properties but is softer and more prone to creep (cold flow) under sustained load. Filled PTFE sheets incorporate materials like glass, carbon, or bronze to enhance specific mechanical properties. Fillers significantly improve wear resistance, reduce creep, increase compressive strength, and can enhance thermal conductivity, making them suitable for demanding mechanical applications like bearings and heavy-duty seals. **Q: How do I choose the right filler type for my application?** A: The choice depends on your primary performance requirement. For general wear resistance and stiffness, glass-filled is a common choice. For applications requiring low friction and good wear in dry or wet conditions, carbon-filled is excellent. For high-load, high-wear applications where heat dissipation is important, bronze-filled is superior. For highly abrasive media or where galvanic corrosion is a concern with bronze, stainless steel filled is recommended. The engineers at Kaxite Sealing can provide detailed guidance based on your specific operating conditions. **Q: Can PTFE sheets be machined or fabricated easily?** A: Yes, PTFE is renowned for its excellent machinability. It can be easily cut, skived, drilled, turned, and milled using standard workshop equipment for metals or plastics. Sharp tools and proper fixturing are recommended to avoid deformation, as the material is soft. Kaxite Sealing provides sheets with consistent density and homogeneity, ensuring clean, precise machining results for complex gaskets, seals, or components. **Q: Are there any chemicals that attack or degrade PTFE?** A: PTFE is virtually inert and is resistant to almost all industrial chemicals, including strong acids, bases, and solvents. The only known chemicals that can affect PTFE at elevated temperatures and pressures are molten alkali metals and certain highly fluorinated compounds. It is this near-universal chemical resistance that makes it the material of choice for gaskets and linings in chemical processing equipment. **Q: What are the temperature limits for PTFE sheets?** A: Kaxite Sealing PTFE sheets maintain useful mechanical properties across an exceptionally broad range. They can be used continuously from cryogenic temperatures as low as -200°C (-328°F) up to +260°C (+500°F). Short-term excursions up to 300°C (572°F) are possible. Prolonged exposure above 260°C can lead to gradual thermal degradation. It does not melt but begins to decompose at temperatures above 327°C (620°F). **Q: Is PTFE safe for use in food contact or medical applications?** A: Yes, Virgin PTFE is physiologically inert and meets FDA regulations for food contact applications under 21 CFR 177.1550. It is also USP Class VI compliant, making it suitable for many medical and pharmaceutical uses. It is critical to ensure that the specific grade used is certified for such applications. Kaxite Sealing offers high-purity, FDA-compliant Virgin PTFE sheets for these sensitive industries. **Q: How does PTFE perform as a gasket material compared to rubber or compressed non-asbestos (CNA)?** A: PTFE outperforms elastomers in extreme chemical and temperature environments where rubbers would fail. It has much lower creep relaxation than traditional soft gaskets, meaning it maintains bolt load better in flanged connections, leading to longer seal life. Compared to CNA, PTFE offers superior chemical resistance, a wider temperature range, and is inherently non-stick. For severe service conditions, PTFE, especially filled grades from Kaxite Sealing, is often the most reliable and cost-effective long-term solution. **Q: Can Kaxite Sealing provide custom-sized or custom-formulated PTFE sheets?** A: Absolutely. While we stock a wide range of standard sheet sizes, thicknesses, and filler grades, Kaxite Sealing specializes in custom solutions. We can manufacture sheets to your exact dimensional requirements. Furthermore, we can develop custom compound formulations with specific filler percentages or blends to meet unique application challenges regarding wear, friction, conductivity, or PV (Pressure-Velocity) limits.