PTFE Flat Gasket is a flat sealing component made from polytetrafluoroethylene (PTFE) for static sealing between mating surfaces. It is commonly used in flanges, valves, pumps, pipe connections, chemical equipment, and fluid-handling systems where resistance to corrosive media is required.
PTFE provides excellent resistance to a broad range of acids, alkalis, solvents, and process chemicals. Unlike metal gaskets, it does not corrode, and its low surface adhesion helps reduce sticking to mating surfaces during disassembly.
JAIFUXIN manufactures PTFE flat gaskets in custom ID, OD, thickness, and shapes according to drawings, samples, or dimensional requirements. Virgin PTFE and selected filled PTFE grades are available for different sealing conditions.
PTFE Flat Gasket Specifications
| Property | Specification |
|---|---|
| Material | PTFE / Polytetrafluoroethylene |
| Type | Flat Gasket |
| Standard Shape | Round / Ring |
| Inside Diameter (ID) | Custom |
| Outside Diameter (OD) | Custom |
| Thickness | Custom |
| Other Shapes | Available to Drawing |
| Material Options | Virgin PTFE / Filled PTFE |
| Manufacturing | Machined / Cut |
| Drawing-Based Production | Available |
| Sample-Based Production | Available |
For custom gaskets, specify ID × OD × thickness, material grade, quantity, and operating conditions.
Where Are PTFE Flat Gaskets Used?
PTFE flat gaskets are primarily used for static sealing between two mating surfaces. When compressed between the surfaces, the gasket fills small surface irregularities and helps limit fluid leakage from the joint.
Typical installation locations include:
- Pipe flanges
- Valve connections
- Pump housings
- Chemical tanks
- Process vessels
- Fluid fittings
- Filter housings
- Laboratory equipment
- Chemical delivery systems
- Semiconductor wet-process equipment
The actual gasket dimensions and material grade should be selected according to the joint design and service conditions.
PTFE Flat Gaskets for Chemical Service
Chemical compatibility is a major reason for specifying a PTFE gasket instead of conventional rubber or fiber gasket materials.
PTFE is resistant to many aggressive process media and is commonly used in chemical-handling systems involving acids, alkalis, solvents, and corrosive fluids.
Typical industries include:
- Chemical processing
- Semiconductor manufacturing
- Pharmaceutical processing
- Laboratory equipment
- Electronics manufacturing
- Fluid handling
- Industrial process equipment
Chemical resistance alone does not determine whether a gasket is suitable. Temperature, pressure, flange design, bolt load, surface condition, and long-term compression should also be considered when selecting the gasket.
Custom ID, OD and Thickness
Most PTFE flat gaskets are specified by three basic dimensions:
ID × OD × Thickness
For example, a customer may specify a gasket based on:
- Inside diameter required to clear the fluid passage
- Outside diameter required to fit the sealing surface
- Thickness required by the joint design
JAIFUXIN can manufacture both metric and inch-size PTFE flat gaskets. For non-standard equipment, production can be based directly on a dimensional drawing or existing sample.
Round and Custom-Shaped PTFE Gaskets
Although ring-shaped gaskets are common, not every sealing surface is circular.
Custom PTFE flat gaskets can also be manufactured in:
- Round
- Square
- Rectangular
- Oval
- Flange profiles
- Multi-hole patterns
- Irregular shapes
Bolt holes, slots, locating holes, and other features can be incorporated according to the drawing.
Virgin PTFE and Filled PTFE Options
The gasket material should be selected according to the actual sealing conditions.
Virgin PTFE
Virgin PTFE flat gaskets are commonly selected where broad chemical resistance, low contamination, and electrical insulation are important.
Filled PTFE
Filled PTFE modifies specific properties of virgin PTFE. Depending on the application, available materials may include:
- Glass-filled PTFE
- Carbon-filled PTFE
- Graphite-filled PTFE
- Bronze-filled PTFE
Filled grades should not be selected simply because they are mechanically stronger. The filler can change chemical compatibility, electrical properties, wear behavior, and other material characteristics.
