For professionals seeking a sealing solution that combines exceptional chemical resistance, broad temperature tolerance, and reliable performance, PTFE Teflon Gaskets stand as the industry benchmark. PTFE, or Polytetrafluoroethylene, often known by the DuPont brand name Teflon®, is a synthetic fluoropolymer prized for its inertness and versatility. At Kaxite, we engineer premium PTFE gaskets that meet the rigorous demands of chemical processing, pharmaceutical, food and beverage, and semiconductor manufacturing. Our commitment is to deliver not just a component, but a guarantee of system integrity, safety, and longevity.
Unlike conventional elastomers or compressed materials, PTFE gaskets offer a unique set of properties that make them indispensable for sealing aggressive media, ultra-pure processes, and extreme environments.
Our gaskets are manufactured from 100% virgin PTFE polymers or tailored compounds to achieve specific performance characteristics. Below are the detailed technical parameters for our standard Virgin PTFE Gasket material.
| Property | ASTM Test Method | Typical Value (Virgin PTFE) | Units |
|---|---|---|---|
| Specific Gravity | D792 | 2.15 - 2.20 | g/cm³ |
| Tensile Strength | D638 | 25 - 35 | MPa (psi) |
| Elongation at Break | D638 | 300 - 500 | % |
| Compression Set (22 hrs @ 25°C) | D395 Method B | 40 - 60 | % |
| Continuous Service Temperature | - | -268°C to +260°C | °C (°F) |
| Thermal Conductivity | C177 | 0.25 | W/(m·K) |
| Coefficient of Linear Thermal Expansion | D696 | 12 x 10-5 | cm/cm/°C |
| Dielectric Strength | D149 | 19.7 | kV/mm |
| Water Absorption | D570 | < 0.01 | % |
We provide PTFE gaskets in various forms to suit all application needs:
Q: What is the main difference between "PTFE" and "Teflon"?
A: PTFE is the generic name for the chemical polymer Polytetrafluoroethylene. "Teflon" is a registered trademark of Chemours (formerly DuPont) for their brand of PTFE. In industrial contexts, the terms are often used interchangeably, but all PTFE is not necessarily "Teflon" brand. Kaxite gaskets are manufactured from high-quality PTFE polymers that meet or exceed the performance standards associated with the trademark.
Q: Can Kaxite PTFE gaskets handle strong acids like sulfuric or hydrochloric acid?
A: Yes, absolutely. This is one of the primary strengths of PTFE. It is highly resistant to virtually all aggressive chemicals, including concentrated sulfuric, hydrochloric, nitric, and hydrofluoric acids, as well as strong caustics like sodium hydroxide. This makes Kaxite PTFE gaskets the default choice for chemical processing plants and laboratory equipment.
Q: Are PTFE gaskets suitable for high-pressure applications?
A: PTFE has good mechanical properties but is a relatively soft material compared to metals. Its performance under pressure depends on the design. For standard flat-face flanges, PTFE sheet gaskets are typically used for low to medium pressures. For higher pressures, a confined design (like a groove) or a reinforced PTFE gasket (such as a jacketed gasket with a metal core) from Kaxite is recommended to prevent extrusion and creep.
Q: What is "creep" or "cold flow" in PTFE gaskets, and how does Kaxite address it?
A: Creep (or cold flow) refers to the tendency of PTFE to slowly deform under sustained load, which can lead to a loss of bolt load and potential leakage over time. Kaxite addresses this in several ways: 1) By designing gaskets with adequate thickness and stress calculations. 2) By offering filled PTFE compounds (with materials like glass, bronze, or carbon) which significantly improve creep resistance for critical applications. 3) By providing expert consultation on proper flange design and bolt torque procedures to minimize this effect.
Q: How do I choose the right thickness for my PTFE gasket?
A: The ideal thickness depends on flange surface finish, flatness, pressure, and bolt load. A general rule is that softer gaskets for uneven surfaces require more thickness. For standard ANSI flanges, 1.5mm (1/16") and 3mm (1/8") are common. For thin, sharp flange faces or high pressure, a thinner gasket (0.5mm to 1mm) may be better. Kaxite's technical team can advise based on your specific flange specifications and operating conditions.
Q: Can Kaxite PTFE gaskets be used in oxygen service?
A: Yes, but with critical precautions. Virgin PTFE is generally acceptable for oxygen service because it is non-flammable in the traditional sense. However, in high-pressure oxygen systems, any contaminant (like grease or dust) on the gasket can pose an ignition risk. Kaxite can supply specially cleaned and packaged PTFE gaskets for oxygen service, ensuring they meet the required cleanliness standards (such as CGA G-4.1 for oxygen equipment).
Q: Are your PTFE gaskets blue? What do the colors mean?
A: Not all PTFE is blue. Virgin PTFE is naturally an opaque white. Colored PTFE usually indicates a filled compound:
Q: How should I store and handle Kaxite PTFE gaskets?
A: PTFE is robust but should be stored properly. Keep gaskets in their original packaging in a cool, dry place away from direct sunlight and heat sources. Avoid sharp bends or kinks, especially on thin gaskets. Ensure flanges are clean, free of old gasket material, and properly aligned before installation. Use a uniform, star-pattern bolt tightening sequence to the recommended torque value to ensure an even seal.
The unique properties of PTFE make Kaxite gaskets essential across a wide spectrum of industries:
Choosing Kaxite means selecting a partner dedicated to precision, quality, and technical expertise. We don't just sell materials; we provide engineered sealing solutions. Our process involves understanding your specific application challenges—pressure, temperature, media, and flange type—to recommend the optimal PTFE gasket material and design. We utilize state-of-the-art machining and skiving equipment to ensure every gasket meets precise dimensional tolerances. Our commitment to quality control means you receive a product that performs reliably from the first installation, reducing downtime and maintenance costs. For your most demanding sealing applications, trust the material expertise and manufacturing excellence of Kaxite.