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No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
In the demanding world of industrial sealing, reliability and chemical resistance are non-negotiable. Among the elite materials that meet these rigorous standards, PTFE, or Polytetrafluoroethylene, stands supreme. Known commercially as Teflon®, PTFE is a synthetic fluoropolymer celebrated for its exceptional inertness and wide temperature range. PTFE Gaskets manufactured from this material are the go-to solution for sealing applications involving aggressive chemicals, extreme temperatures, and stringent purity requirements. At Kaxite Sealing, we leverage decades of material science expertise to engineer PTFE gaskets that deliver uncompromising performance and longevity, ensuring your operations run smoothly and leak-free.
The selection of a gasket material is critical to system integrity. PTFE offers a unique combination of properties that make it indispensable across countless industries, from pharmaceutical and food processing to chemical and semiconductor manufacturing.
Kaxite Sealing’s PTFE gaskets are precision-manufactured to harness these inherent properties, providing a seal that maintains its characteristics over time without leaching, corroding, or degrading.
Our product lineup is designed to cater to diverse pressure classes, flange types, and specific application challenges. Below are the detailed specifications for our standard and enhanced PTFE gasket offerings.
| Grade | Description | Density (g/cm³) | Tensile Strength (MPa) | Continuous Service Temp. | Primary Applications |
|---|---|---|---|---|---|
| Virgin PTFE | 100% pure, uncompounded Polytetrafluoroethylene. | 2.15 - 2.20 | 25 - 35 | -200°C to +260°C | Ultra-pure, food, pharmaceutical, aggressive chemicals. |
| Reinforced PTFE | PTFE compounded with glass, carbon, or bronze fibers. | 2.2 - 2.5 | 30 - 45 | -200°C to +260°C | Higher pressure applications, improved creep resistance. |
| Expanded PTFE (ePTFE) | Microporous structure from expanded PTFE tape. | 0.4 - 1.2 | 10 - 25 (varies) | -240°C to +315°C | Jacketing, spiral wounds, sheet gasketing for uneven surfaces. |
| Chemically Modified PTFE | PTFE with altered polymer structure for improved weldability. | 2.15 - 2.17 | 30 - 40 | -200°C to +260°C | Complex molded parts, linings, and components requiring thermal bonding. |
| Flange Type (ASME B16.21) | Standard Size Range (NPS) | Thickness (inch/mm) | Pressure Class (ANSI) | Color Code (Kaxite) |
|---|---|---|---|---|
| Flat Ring | 1/2" to 60" | 1/16" (1.6mm), 1/8" (3.2mm) | 150, 300, 600 | White (Virgin), Beige (Reinforced) |
| Full Face | 1/2" to 24" | 1/16" (1.6mm), 1/8" (3.2mm) | 150 | White |
| RF Raised Face | 1/2" to 24" | 1/16" (1.6mm), 1/8" (3.2mm) | 150, 300 | White with Blue Stripe |
Note: Custom sizes, thicknesses, and shapes (oval, square, irregular) are available upon request. Kaxite Sealing utilizes advanced CNC cutting and skiving technology for precise, burr-free edges.
Q: What is the main advantage of PTFE over rubber gaskets?
A: The primary advantage is PTFE's near-universal chemical resistance. While rubber gaskets (like EPDM or Nitrile) can degrade when exposed to oils, acids, or solvents, PTFE remains unaffected by almost all industrial chemicals. Additionally, PTFE offers a much wider operating temperature range.
Q: Can PTFE gaskets be used for high-pressure applications?
A: Pure, virgin PTFE has a tendency to "cold flow" or creep under sustained high pressure and bolt load. For high-pressure applications, Kaxite Sealing recommends our Reinforced PTFE grades. The added fillers (like glass or carbon) significantly improve compressive strength and reduce cold flow, making them suitable for higher pressure classes.
Q: Are PTFE gaskets suitable for food and pharmaceutical use?
A: Absolutely. Virgin, unpigmented PTFE is compliant with FDA regulations CFR 21.177.1550, EU Regulation 10/2011 for food contact, and USP Class VI for pharmaceutical applications. Kaxite Sealing's virgin PTFE gaskets are manufactured in a controlled environment to ensure the highest purity standards.
Q: How do I choose between Virgin PTFE and Expanded PTFE (ePTFE)?
A: Virgin PTFE is ideal for static sealing of flat, smooth flanges with standard bolt loads, especially where maximum chemical resistance is needed. Expanded PTFE (ePTFE) is softer, more conformable, and excels at sealing uneven or slightly damaged flange surfaces, low bolt load situations, and as a jacketting material for spiral wound gaskets. It also has excellent thermal insulation properties.
Q: What is the shelf life of PTFE gaskets? Do they degrade over time?
A: PTFE is an incredibly stable polymer. When stored properly in a cool, dark place away from direct UV light and extreme heat, PTFE gaskets have an essentially indefinite shelf life. They do not dry out, harden, or become brittle like elastomers.
Q: How do I determine the correct thickness for my application?
A: The standard thicknesses are 1/16" for ASME B16.21 style gaskets and 1/8" for full-face gaskets. Thinner gaskets (1/32") may be used for low-pressure, low-temperature applications with very smooth flanges. Thicker gaskets can compensate for flange misalignment or surface imperfections. Our engineering team at Kaxite Sealing can advise on the optimal thickness based on your specific flange condition, pressure, and temperature.
Q: Can Kaxite Sealing provide custom-shaped PTFE gaskets?
A: Yes, custom fabrication is a core strength at Kaxite Sealing. We can produce gaskets in any shape—oval, square, rectangular, or completely irregular—from CAD drawings, samples, or templates. We also specialize in large-diameter gaskets and complex molded PTFE components.
The versatility of PTFE makes it a critical component in sealing solutions across a broad spectrum of industries. Kaxite Sealing's products are trusted in these demanding environments:
0086-574-87527773
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China