High-Quality PTFE Gaskets for Industrial Applications Made in China

PTFE Gaskets represent the pinnacle of sealing technology, engineered to handle the most demanding industrial applications where chemical resistance, thermal stability, and purity are non-negotiable. For industries ranging from chemical processing and pharmaceuticals to food and beverage and semiconductor manufacturing, PTFE (Polytetrafluoroethylene) gaskets offer an unparalleled combination of inertness and performance. Kaxite Sealing has dedicated decades to mastering the formulation and fabrication of these critical components, establishing ourselves as a trusted global supplier of high-integrity sealing solutions. Our commitment extends beyond supply; we provide engineering expertise to ensure your systems achieve leak-free operation, maximum safety, and extended service life. PTFE, commercially known as Teflon®, is a fully fluorinated synthetic polymer. Its unique molecular structure, a carbon chain surrounded by fluorine atoms, grants it exceptional properties that make it ideal for gasket materials. Unlike elastomers or compressed non-asbestos materials, PTFE is chemically inert, meaning it resists attack from virtually all industrial chemicals and solvents. It operates across a vast temperature range, maintains flexibility at cryogenic levels, and does not become brittle or degrade like many alternative materials. For sealing flanges in aggressive service, specifying a PTFE gasket from a reputable manufacturer like Kaxite Sealing is often the most reliable and cost-effective long-term decision. ### Key Advantages of Kaxite Sealing PTFE Gaskets Choosing our PTFE gaskets brings a suite of critical benefits to your operation: * **Universal Chemical Resistance:** Inert to nearly all chemicals, including strong acids, bases, halogens, and organic solvents. This eliminates swelling, softening, or degradation common with rubber-based gaskets. * **Extreme Temperature Suitability:** Performs consistently from cryogenic temperatures as low as -268°C (-450°F) up to +260°C (+500°F) continuously, with short-term peaks even higher. * **Excellent Anti-Stick & Non-Contaminating Properties:** The low-friction, non-stick surface prevents adhesion of process media and allows for easy gasket removal during maintenance. It is also FDA-compliant for food contact and ultra-pure for semiconductor applications. * **Superior Weatherability & UV Resistance:** Unlike many polymers, PTFE is completely unaffected by sunlight, ozone, or weathering, making it suitable for long-term outdoor installations. * **Excellent Electrical Properties:** Serves as an effective electrical insulator with a high dielectric strength. * **Zero Moisture Absorption:** PTFE does not absorb water or process fluids, ensuring dimensional stability and preventing corrosion under the gasket (CUG). * **Long-Term Creep Resistance (with proper design):** Through advanced fillers and manufacturing techniques, Kaxite Sealing mitigates the cold flow tendency of pure PTFE, ensuring a lasting seal. ### Comprehensive Product Parameters & Specifications Our PTFE gaskets are available in multiple forms, each tailored for specific pressure, flange type, and application requirements. #### 1. PTFE Sheet Gaskets (Cut or Skived) Ideal for standard flanges (ANSI, DIN, JIS) in low to medium-pressure services. | Parameter | Specification | Details / Benefit | | :--- | :--- | :--- | | **Material Grade** | Pure Virgin PTFE, Glass Filled, Carbon Filled, Bronze Filled | Filled grades improve creep resistance and thermal conductivity. | | **Sheet Thickness** | 0.5mm (1/64") to 6.0mm (1/4") | Standard and custom thicknesses available. | | **Standard Size Sheets** | 1m x 1m, 1.2m x 1.2m, 1.5m x 1.5m | Efficient for in-house cutting or custom die-cut orders. | | **Color** | Pure White (Virgin), Brown/Bronze (Filled) | Easy visual identification of material type. | | **Temperature Range** | -268°C to +260°C (-450°F to +500°F) | Full-range capability. | | **Pressure Rating** | Up to 150 psi (10 bar) for pure PTFE; higher with filled grades. | Dependent on flange design and service conditions. | | **Standards** | FDA CFR 21, USP Class VI, EU 10/2011, ISO 10993 | Compliant for sanitary and pharmaceutical uses. | #### 2. PTFE Envelope Gaskets A cost-effective solution combining a soft PTFE envelope with an inner core of resilient material (like compressed non-asbestos). | Parameter | Specification | Details / Benefit | | :--- | :--- | :--- | | **Envelope Material** | 100% Virgin PTFE Film (0.2mm to 0.5mm thick) | Provides full chemical resistance on sealing faces. | | **Filler/Core Material** | Compressed Non-Asbestos (CNA), Ceramic, Graphite | Provides compressibility and recovery for lower bolt loads. | | **Temperature Range** | -40°C to +200°C (-40°F to +392°F) | Limited by core material. | | **Pressure Rating** | Up to 300 psi (20 bar) | Suitable for a wider range of pressures. | | **Flange Types** | Raised Face (RF), Flat Face (FF) | Most common for pump covers, manways, and heat exchangers. | #### 3. PTFE Thread Seal Tape (Plumber's Tape) For sealing tapered pipe threads (NPT) in liquid and gas systems. | Parameter | Specification | Details / Benefit | | :--- | :--- | :--- | | **Width** | 12mm (1/2"), 19mm (3/4"), 25mm (1") | Standard widths for all common pipe sizes. | | **Length per Roll** | 5.2m (17 ft), 10m (33 ft), 20m (66 ft) | Various lengths for maintenance kits or bulk use. | | **Thickness** | 0.075mm (3 mil) Standard Density, 0.1mm+ (High Density) | High-density tape offers greater strength for high-pressure lines. | | **Color** | White (Standard), Pink (Hi-Density), Yellow (Gas Line) | Color-coding for easy identification of tape grade. | #### 4. Kaxite Sealing PTFE Cord & String Used for packing valve stems, forming custom gaskets on-site, or sealing irregular surfaces. * **Diameters:** 1mm to 25mm (1/16" to 1"). * **Density:** High-purity, extruded for consistency and minimal porosity. * **Packing:** Ideal for static seals or low-speed rotary/stem applications in chemical pumps and valves. ### Critical Selection Factors Choosing the right PTFE gasket involves more than just material. Consider these factors with our technical team: 1. **Chemical Environment:** Provide the full list of media, concentrations, and temperatures. PTFE is nearly universal, but certain rare chemicals (like molten alkali metals) can affect it. 2. **Temperature & Pressure Cycles:** Consider both normal operating conditions and any potential thermal or pressure shock during startups/shutdowns. 3. **Flange Conditions:** Surface finish (ideally 125-250 µin Ra), flatness, bolt load capability, and flange type (RF, FF, RTJ, Tongue & Groove). Poor flange conditions may require a more conformable filled PTFE or envelope design. 4. **Regulatory Requirements:** For food, pharmaceutical, or potable water, ensure the PTFE grade meets FDA, USP, NSF, or WRAS standards. Kaxite Sealing provides full material traceability and certifications. 5. **Creep (Cold Flow) Consideration:** For high-stress applications, specify filled PTFE (glass, carbon, bronze) or consider a PTFE envelope gasket. These resist deformation under constant load better than pure PTFE. ### Frequently Asked Questions (FAQ) About PTFE Gaskets **Q: What is the main difference between Virgin PTFE and Filled PTFE gaskets?** A: Virgin PTFE is 100% pure Polytetrafluoroethylene, offering the best possible chemical resistance and purity. Filled PTFE incorporates materials like glass fibers, carbon, or bronze powder (typically 5-25% by weight) to enhance mechanical properties. The fillers significantly improve creep resistance (reducing cold flow), increase hardness and wear resistance, and enhance thermal conductivity. The choice depends on the application: pure for ultra-corrosive or ultra-pure services, filled for high-stress flanges or where extrusion resistance is critical. **Q: How do I prevent a PTFE gasket from "cold flowing" or creeping out of the flange?** A: Cold flow is the tendency of PTFE to slowly deform under sustained pressure. To prevent it: 1) Use filled PTFE grades from Kaxite Sealing designed for superior creep resistance. 2) Ensure flange surfaces are smooth, flat, and parallel. 3) Use a gasket with adequate thickness—thinner gaskets (1.5mm or 1/16") are often better for pure PTFE. 4) Apply the correct bolt torque in a proper star-pattern sequence to create an even, distributed load. 5) For severe service, consider a PTFE envelope gasket or a Kammprofile gasket with a PTFE layer. **Q: Are PTFE gaskets suitable for high-pressure applications?** A: While pure PTFE sheet gaskets are generally limited to low/medium pressure (e.g., 150 psi), they can be used in higher-pressure systems when designed correctly. For pressures above 300 psi (20 bar), we recommend our filled PTFE grades, PTFE envelope gaskets (which utilize a stronger core), or more advanced designs like PTFE-clad metal gaskets (for Ring Type Joint or other high-integrity flanges). Always consult Kaxite Sealing's engineering department for high-pressure sealing solutions. **Q: Can PTFE gaskets be used for oxygen service?** A: Yes, but with critical precautions. PTFE itself is highly resistant to ignition and is acceptable for oxygen service. However, the gasket must be meticulously clean, free of any organic contaminants (like oil, grease, or cutting debris), and ideally specified as "Oxygen Clean" or "Oxygen Service Ready." Kaxite Sealing offers specialized cleaning and packaging protocols (per ASTM G93) for gaskets used in high-pressure oxygen systems to prevent fire hazards. **Q: How do I install a PTFE sheet gasket correctly?** A: Proper installation is key. Clean both flange faces thoroughly. Inspect the gasket for nicks or damage. Do not use lubricants or adhesives on the gasket. Center the gasket carefully on the flange. Insert all bolts hand-tight. Then, using a calibrated torque wrench, tighten the bolts in a star or crisscross pattern to 30% of the final torque. Repeat the pattern at 60%, and finally at 100% of the recommended torque value. This sequence ensures even compression and prevents the gasket from being pinched or extruded. **Q: Why should I choose Kaxite Sealing for my PTFE gasket needs?** A: Kaxite Sealing brings decades of specialized material science and sealing application expertise. We are not just a distributor; we are technical partners. Our products are manufactured under strict quality controls from certified raw materials. We offer full technical support, from material selection and design review to failure analysis. Our global logistics ensure you get the right seal, at the right time, anywhere in the world. With Kaxite Sealing, you invest in reliability, safety, and total cost-of-ownership reduction for your operations.