bulk expanded PTFE gasket

Bulk Expanded PTFE Gasket for Chemical, Cryogenic and Low Bolt Load Flanges

Quick Answer: Expanded PTFE gaskets are soft, conformable PTFE sheet gaskets with a microporous structure. Bulk expanded PTFE gasket material is used for chemical service, fragile flanges and low bolt load joints. CORASEALS can supply expanded PTFE gasket sheets, rolls and custom cut gaskets to the dimensions, thickness and flange standard you specify.

Expanded PTFE gasket material is a practical choice for volume users. The expanded structure improves compressibility and reduces the bolt load required to seat the gasket. The material suits plastic flanges, FRP flanges, glass lined equipment and flanges with surface damage or misalignment.

What Is an Expanded PTFE Gasket?

Expanded PTFE is produced by expanding PTFE into a microporous structure. The result is a soft gasket sheet that is more compressible than skived PTFE. It conforms to irregular sealing surfaces and seals at lower gasket stress. The material remains flexible at cryogenic temperatures and resists most industrial chemicals.

Bulk Supply Forms

Bulk supply covers several formats. Common forms include:

Expanded PTFE sheet in standard sheet sizes
Expanded PTFE roll in selected widths and thicknesses
Custom cut gaskets in annular, full face and non standard shapes

For maintenance teams and gasket cutters, sheet and roll formats reduce cutting waste. For OEM production and MRO kits, custom cut gaskets can be packed in exact sizes and quantities.

Performance and Service Limits

Typical expanded PTFE gasket material can operate from -268 °C to 260 °C in continuous service. The actual temperature limit depends on grade, thickness and service fluid. The material has broad chemical resistance to acids, alkalis, solvents and many aggressive chemicals. It is not suitable for molten alkali metals and elemental fluorine in certain conditions.

Expanded PTFE gaskets are generally used on low to medium pressure flanges. Pressure capability depends on sheet thickness, flange design, gasket stress and operating temperature. Thin sheets normally suit higher internal pressure, but thin sheets need better flange surfaces and more accurate installation.

PTFE based gaskets can relax after thermal cycling. Some installations require retorque after the first cycle. Follow the gasket manufacturer instructions for the selected grade.

Applications

Bulk expanded PTFE gasket material is used in chemical piping, acid transfer lines, pharmaceutical equipment, food processing, water treatment, heat exchangers, glass lined reactors, FRP flanges and cryogenic piping. The same material can be supplied as cut gaskets for flange repair work and for equipment where flange surfaces are no longer smooth.

Material Comparison

Expanded PTFE vs skived PTFE vs filled PTFE for gasket selection
Property	Expanded PTFE	Skived PTFE	Filled PTFE
Compressibility	High	Low to medium	Low to medium
Conformability	Good on irregular flanges	Limited	Limited
Chemical resistance	Broad	Broad	Broad, limited by filler
Typical temperature range	-268 °C to 260 °C	-200 °C to 260 °C	-200 °C to 260 °C
Common use	Fragile flanges, chemical service, low bolt load	Rigid flanges, general chemical service	Higher load applications, some compressor and pump services

These values are typical supplier data. The selected grade and data sheet must govern the final gasket choice.

How to Specify and Request a Bulk Quote

For a bulk expanded PTFE gasket quote, prepare the following information:

Gasket type, full face or inside bolt circle
Inside diameter, outside diameter and thickness in mm or inches
Sheet size or roll width for bulk material
Flange standard such as ASME B16.21 or EN 1514-1
Operating temperature, pressure and fluid
Required quantity and any packaging requirement

Send us the gasket type, ID, OD, thickness, flange standard, fluid, pressure, temperature, required quantity and any drawing or sample photo. Submit the details through the CORASEALS contact page for a bulk expanded PTFE gasket quote.

If the flanges require a harder or filled material, compare PTFE gasket options or industrial gasket types.

Frequently Asked Questions

What is the difference between expanded PTFE and skived PTFE gaskets? Expanded PTFE is softer and more compressible. Skived PTFE is stiffer and requires higher bolt load. Expanded PTFE usually seals better on fragile or irregular flanges.

Can bulk expanded PTFE gasket material be used in food service? Food grade grades are available. Specify FDA compliant expanded PTFE when the application requires food contact compliance. Do not use a general industrial grade unless the supplier confirms the grade is suitable.

What flange standards can be supplied? Bulk expanded PTFE gaskets can be cut to common flange standards including ASME B16.21 and EN 1514-1. Custom shapes are also possible. Send a drawing for non standard flanges.

What details should I send for a custom cut gasket quote? Send the ID, OD, thickness, gasket type, flange standard, fluid, temperature, pressure and required quantity. A drawing or sample photo helps confirm the shape and bolt holes.

Does CORASEALS supply both sheet material and finished gaskets? CORASEALS can supply bulk expanded PTFE gasket sheets, rolls and custom cut gaskets. The supply format depends on your cutting capability and production volume.