PTFE Ring Gasket

What is a PTFE Ring Gasket

A PTFE Ring Gasket is a flat, ring-shaped sealing element machined or molded from polytetrafluoroethylene and installed between two flange faces. Compared with other plastics, PTFE offers superior resistance to chemicals and temperature, making it the standard choice for flanges handling corrosive fluids, food-grade products or pharmaceutical media.

Because PTFE is chemically inert, the ring does not react with the process fluid and does not contaminate it. It is also non-stick, low-friction and electrically insulating. For higher pressure classes, a filled PTFE grade or a stainless steel core with PTFE envelope can be used to improve creep resistance. The right grade and thickness depend on media, temperature, pressure class and flange face.

Why buyers source from Kaxite

1. Direct factory supplyMachined in our Ningbo workshop — no trading layer, no hidden margin.
2. Machined to your drawingNon-standard IDs, ODs, thicknesses and bolt-hole patterns produced to DWG, DXF or sample.
3. Virgin and filled grades in one orderChoose per flange — no need to split the order across multiple suppliers.
4. Batch traceabilityPTFE resin batch and machining dimensions recorded per production lot for project documentation.
5. Fast turnaround on repeat sizesStandard sizes and stock thicknesses ship quickly; project sizes scheduled per order.

Material and construction

Two standard product forms

• Virgin PTFE ring gasket — default for chemical, food and pharmaceutical service. Best chemical resistance and no media contamination.
• Filled PTFE ring gasket — glass fiber, carbon, graphite, bronze or MoS2 filled for higher pressure classes and improved creep resistance.
• Envelope-style ring — stainless steel or fiber core wrapped in PTFE, for high pressure and thermal cycling where a solid PTFE ring would cold-flow.
• Thickness — typically 1.5 mm to 6 mm depending on flange size and pressure class. Thicker rings available on request.

Typical applications

Technical data

Material

Virgin PTFE or filled PTFE (glass fiber, carbon, graphite, bronze, MoS2)

Temperature range

−200 °C to +260 °C (continuous service)

Chemical range

pH 0–14, resistant to acids, bases and most solvents

Standard thickness

1.5 mm to 6 mm, thicker on request

Size range

DN15 to DN1200 nominal, plus custom IDs / ODs to drawing

Flange compatibility

Raised face, flat face, tongue-and-groove, male-and-female

Surface finish

Machined or skived, Ra 0.8–3.2 µm typical

Customization

Custom ID, OD, thickness, bolt-hole pattern, marking

How to order

To quote accurately and quickly, please provide the following with your inquiry:

1. Flange standard and pressure class (e.g. ASME B16.5 Class 150 / EN 1092 PN16 / JIS 10K)
2. Nominal size or specific ID / OD / thickness in mm
3. Grade — virgin PTFE or a specific filled grade
4. Quantity per size and required delivery date
5. Documentation required — material certificate, dimensional inspection report

Frequently asked questions

Related products: Pure PTFE Gaskets Expanded PTFE Gaskets PTFE Envelope Gaskets Modified PTFE Gaskets