PTFE Gasket

PTFE Gasket Product Overview

The SIYelectric PTFE Gasket is a flat sealing gasket made from PTFE, also known as polytetrafluoroethylene. It is widely used for sealing flange connections, valve connections, pipe joints, instrument accessories, and process equipment interfaces.

PTFE gaskets are known for their excellent resistance to many acids, alkalis, solvents, and corrosive chemicals. Because of this, they are commonly used in chemical processing, water treatment, pharmaceutical systems, food and beverage utilities, laboratory pipelines, valve sealing, and pressure instrumentation applications.

In industrial piping systems, this product may also be called a PTFE flange gasket, PTFE flat gasket, PTFE sealing gasket, or PTFE washer, depending on the installation position and application.

Product Description

A PTFE gasket is mainly used to seal the gap between two connected surfaces. When installed between two flanges, the gasket is compressed by bolts and forms a sealing layer between the flange faces.

Compared with rubber gaskets, PTFE gaskets provide better chemical resistance. Compared with metal gaskets, PTFE gaskets are softer and more suitable for many corrosive media and lower to medium pressure sealing applications.

For flange and valve sealing, PTFE gaskets are often used in systems handling:

• acids and alkalis
• corrosive chemical liquids
• solvents
• water and wastewater
• food and beverage utility media
• pharmaceutical process or utility fluids
• laboratory fluids and gases
• low to medium pressure industrial pipelines

In pressure measurement applications, PTFE gaskets can be used with flanged pressure transmitters, diaphragm seal pressure transmitters, single flange level transmitters, dual flange differential pressure level transmitters, flushing rings, mating flanges, threaded flanges, and flanged pipe fittings.

Key Features

Excellent Corrosion Resistance

PTFE material has strong resistance to many acids, alkalis, solvents, and chemical media, making it suitable for corrosive process environments.

Suitable for Flange and Valve Sealing

The gasket can be installed between pipe flanges, valve flanges, equipment flanges, and instrument connection flanges to help prevent leakage.

Flat Gasket Structure

As a PTFE flat gasket, it provides a simple and effective sealing solution for many standard flange connections.

Non-Metallic Sealing Material

PTFE is a clean, non-metallic material and is useful where metal contamination, corrosion, or chemical reaction must be avoided.

Low Friction and Good Sealing Performance

The smooth PTFE surface helps create stable sealing under proper bolt loading and flange surface conditions.

Custom Sizes Available

PTFE gaskets can be supplied according to different flange standards, pipe sizes, thicknesses, and special drawing requirements.

Technical Specifications

Applications

Flange Sealing

Used as a PTFE flange gasket between pipeline flanges, equipment flanges, vessel nozzles, and process connections.

Valve Sealing

Suitable for valve flange connections and valve-related sealing points in chemical, water, and industrial fluid systems.

Pressure Instrument Connections

Used with flanged pressure transmitters, diaphragm seal transmitters, flushing rings, threaded flanges, and other pressure instrument accessories.

Diaphragm Seal and Level Transmitter Installation

For single flange and dual flange differential pressure level transmitters, PTFE gaskets can be used between the process flange and the diaphragm seal flange when chemical compatibility is suitable.

Chemical Processing

Applied in acid, alkali, solvent, dosing, and chemical transfer systems where corrosion-resistant sealing is required.

Water Treatment and Wastewater Systems

Used in filtration systems, dosing pipelines, wastewater systems, desalination equipment, and water distribution systems.

Pharmaceutical and Food Utility Systems

Suitable for compatible clean utility lines, water systems, and auxiliary process lines where non-metallic sealing material is preferred.

Laboratory and Analytical Systems

Used in small-scale pipelines, test equipment, analytical devices, and laboratory fluid or gas systems.

Advantages

• Excellent chemical resistance for acids, alkalis, solvents, and corrosive media.
• Commonly used as a PTFE flange gasket for industrial flange sealing.
• Suitable for flange and valve sealing gasket applications.
• Soft flat gasket structure supports reliable sealing under proper compression.
• Non-metallic material helps avoid metal corrosion or contamination concerns.
• Can be used with pressure transmitter accessories, including flushing rings and diaphragm seal flanges.
• Available in customized sizes and thicknesses according to flange standards or drawings.
• Suitable for chemical, water treatment, pharmaceutical, food utility, laboratory, and industrial systems.

Selection Notes

When selecting a PTFE gasket, confirm the following details:

1. Flange standard and size
   Confirm whether the flange follows ASME, EN, DIN, JIS, GB, or another standard.
2. Gasket size and thickness
   Confirm inner diameter, outer diameter, bolt hole size, bolt circle diameter, and gasket thickness.
3. Medium compatibility
   PTFE has excellent chemical resistance, but the actual medium concentration, temperature, and pressure should still be checked.
4. Working temperature
   Confirm whether the operating temperature is suitable for PTFE material.
5. Pressure condition
   PTFE gaskets are commonly used in low to medium pressure flange sealing. For high-pressure or severe temperature cycling applications, spiral wound gaskets may be more suitable.
6. Flange face type
   Confirm whether the flange face is RF, FF, or another sealing face type.
7. Instrument application
   If used with pressure transmitters, diaphragm seals, or flushing rings, confirm the gasket size, bolt length, and installation space.