Company Profile

Bulk PTFE Gaskets: Material Grades, Custom Sizing, and Wholesale Supply

Quick Answer: Bulk PTFE gaskets are flat static seals cut from virgin or filled PTFE sheet, or machined from PTFE rod or billet. CORASEALS is a bulk PTFE gasket supplier for standard flange dimensions and custom ID × OD × thickness sizes. Request a quote with the PTFE grade, dimensions, temperature, pressure, medium, and required quantity.

What Is a Bulk PTFE Gasket?

A bulk PTFE gasket order usually contains one size in high volume, multiple sizes for a maintenance project, or a repeat production batch. The main selection points are PTFE grade, gasket profile, thickness, flange standard, and operating conditions. CORASEALS supplies bulk PTFE gaskets for chemical, pharmaceutical, food, water treatment, and general industrial flange sealing.

PTFE Gasket Material Grades

Bulk PTFE gaskets can be cut from sheet or machined from rod. The gasket shape can be a flat ring, full face, oval, rectangular, or a custom profile according to a drawing. Common material options for PTFE gaskets include:

• Virgin PTFE for broad chemical resistance and clean service.
• Glass filled PTFE for lower cold flow and better compression resistance.
• Carbon filled PTFE for chemical service where lower creep is required.
• Graphite filled PTFE for reduced permeability and lower friction on flange faces.
• Barium sulfate filled PTFE for selected food and pharmaceutical applications when the grade is approved by the end user.
• Bronze filled PTFE for selected non-chemical applications where higher hardness is required.

Do not select a filled PTFE grade by cost alone. The filler changes chemical compatibility, hardness, surface finish, and gasket seating behavior. The end user must confirm the PTFE grade against the actual process medium and operating limits. A filler that improves creep resistance can reduce chemical compatibility in strong acids or oxidizing media.

Standard and Custom Dimensions

CORASEALS produces bulk PTFE gaskets according to customer drawings, flange standards, or sample measurement. The required size must be stated as ID × OD × thickness. For full face gaskets, also provide the bolt circle diameter and number of bolt holes.

Common flange standards used for PTFE gasket orders include ASME B16.5, ASME B16.47, EN 1092-1, JIS B2220, and DIN flange dimensions. Some older equipment uses non-standard flanges. In those cases, a physical sample or dimension sketch is more reliable than a type code.

Typical PTFE gasket thicknesses are selected from 0.5 mm to 6 mm. Thinner gaskets are often used for smooth flange faces and lower bolt loads. Thicker gaskets can absorb more flange irregularity but may increase creep and relaxation. The correct thickness depends on flange design, bolt load, temperature, and pressure.

For critical jobs, CORASEALS confirms sheet availability, filler content, and dimensional tolerance before quotation. Do not assume every PTFE grade is available in every sheet thickness or sheet size.

Operating Limits and Material Limitations

PTFE gaskets are widely used in chemical, acid, caustic, solvent, food, pharmaceutical, and water treatment flanges. Virgin PTFE has excellent chemical resistance, but it can creep under high bolt load and elevated temperature.

The general continuous temperature limit for virgin PTFE gaskets is about 260 °C. Actual service temperature may be lower because of pressure, flange load, thermal cycling, and gasket thickness. Filled PTFE grades may improve creep resistance, but the filler can change chemical compatibility.

PTFE gaskets are not always suitable for high pressure steam lines, aggressive thermal cycling, or flanges with poor bolt control. For those services, the maintenance team may need to consider a filled PTFE gasket