PTFE Envelope Ring Gasket

Product Description

A PTFE Envelope Ring Gasket is a composite gasket designed for sealing applications where chemical resistance and mechanical strength are critical. It typically contains the following components:

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1. Outer Layer: PTFE Envelope

• Material: Made from pure or modified Polytetrafluoroethylene (PTFE).
• Purpose: Provides chemical resistance and prevents media contamination. The PTFE layer ensures compatibility with aggressive chemicals, making it ideal for corrosive environments.
• Design: The envelope is shaped to encase the inner core, either fully or partially, depending on the application.

2. Inner Core (Filler Material)

• Materials: The core is made of a more compressible material that provides structural strength, flexibility, and resilience. Common filler materials include:
  • Elastomers: Nitrile rubber (NBR), EPDM, or silicone for flexibility.
  • Compressed Fiber: Aramid or graphite-reinforced sheets for improved mechanical strength.
  • Soft Materials: Non-asbestos fibers or cork for softer sealing applications.
  • Metallic Core (optional): Stainless steel or other metals for extreme pressure and temperature applications.
• Purpose: Enhances the mechanical properties of the gasket, ensuring a tight and reliable seal under pressure.

3. Sealing Edge

• Construction: The PTFE envelope extends over the sealing surface, ensuring direct contact with the flange to provide a chemical-resistant seal.

Types of PTFE Envelope Configurations

1. Slit-Type Envelope:
   • A single slit cut into the PTFE allows the core to fit inside.
2. Molded-Type Envelope:
   • The PTFE is molded to fully encapsulate the core, offering better durability and resistance to delamination.

Additional Features

• Thickness: Available in various thicknesses to match specific applications.
• Customization: Can include multiple layers of PTFE or other advanced fillers for specialized needs.