Flexible Graphite Gaskets

Flexible graphite (often sold under trade names like Grafoil® or Graphtek®) is a thin-foil gasketing material made from expanded mineral graphite. It is the specification for the hottest, most chemically aggressive flange sealing applications where elastomers and compressed fiber materials cannot survive.

Durometer
0.015" to 0.125" thickness
Highlight
Exceptional thermal stability
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Custom Graphite gaskets from Cannon Gasket
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Properties of Graphite gaskets

Cannon Gasket cuts Graphite gaskets to your drawing in durometer and thickness specifications of 0.015" to 0.125" thickness. Broad resistance across aggressive media including acids, bases, and solvents. Excellent in high-temperature steam and thermal cycling service.

Graphite tolerances and customization

Standard dimensional tolerances on Graphite gaskets land around ±0.010" to ±0.015" on OD and ID, depending on material durometer and thickness. Tighter tolerances are available on selected grades. Cannon Gasket cuts Graphite to custom profiles in-house and matches lead times to your production volume. PSA backing, pad printing, custom packaging, and kitting are all on the menu when you need them.

How Flexible Graphite Performs

- Resistance to virtually all chemicals except strong oxidizers. - Excellent recovery and compressibility — adapts to flange face roughness. - Reinforced grades (with stainless steel insert) handle high bolt loads.

Where Graphite Gaskets Are Specified

Refinery and petrochemical pipe flanges, power generation steam and feedwater service, high-temperature heat exchangers, chemical processing, and applications where temperature or aggressive chemistry rules out fiber and rubber.

Reinforced vs Pure Sheet

- Pure graphite sheet — best chemical resistance, lower mechanical strength. - Stainless-reinforced graphite — stainless mesh or perforated insert for high bolt loads. - Tanged graphite — for higher-pressure applications.

Manufacturing Methods

Die-cut, Flash cut and steel-rule-cut. Often cut as ring gaskets for pipe flanges.

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Key Properties
  • Thickness
  • Exceptional thermal stability
  • High compressibility & recovery
  • Low creep relaxation
  • Thermal cycling capable
Engineering Tools
Applications
  • High-temperature flanges
  • Steam systems
  • Power generation
  • Refinery piping
  • Chemical processing
  • Thermal cycling applications
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Frequently Asked Questions

Common Graphite questions.

Are you ISO 9001 certified?
Yes, ISO 9001:2015 certified. Documented quality management covers incoming material verification, in-process inspection, calibrated measurement, final inspection, non-conformance handling, corrective action, and full lot traceability. AS9100-ready for aerospace, with MIL-spec and FDA 21 CFR 177.2600 / USP Class VI grades available on request.
Can you cut custom gasket profiles?
Yes. Custom steel-rule and rotary tooling is built in-house from your drawing or DXF. Complex profiles, multiple through-cuts, tight bolt patterns, and irregular perimeters are all standard work.
Can you supply PSA-backed gaskets?
Yes. Pressure-sensitive adhesive backing is a standard option on most rubber and fiber gasketing, with either permanent or removable liners. Kiss-cut on liner and through-cut both supported on flatbed and rotary presses.
What tolerances can you hold on gasket dimensions?
Standard die-cut tolerance is ±0.010 to ±0.015 inch on OD and ID, depending on material durometer and thickness. Tighter tolerances are available on select grades and thicknesses. Ask if your drawing specifies something tighter and we will confirm feasibility during the quote.
Which gasket material is right for my application?
Start with temperature range, fluid contact, and regulatory requirements. Buna-N is the default for oil and fuel. EPDM for weather, water, and steam. Silicone for extreme temperature and FDA grades. Viton for aggressive chemicals. Our gasket material selection guide walks through the decision framework.
How fast do you return a quote?
Most RFQs come back within one business day. Simple profile updates to an existing tool quote same-day. Send a drawing, DXF, or competing part number and our engineering team reviews material, tolerance, and volume before pricing.
What is the minimum order quantity?
Minimums depend on the part and material. We cut prototype and first-article quantities for engineering evaluation, then scale up to production volumes from the same tooling. For high-volume programs we run JIT, VMI, and Kanban replenishment out of Fontana, California.
What should I send with an RFQ?
Ideal: a drawing or DXF, material spec (or compound family), estimated annual volume, and any regulatory callouts (FDA, USP Class VI, AS9100, MIL-spec). If you only have a sample or a part number from a competing supplier, send that and we will reverse-engineer the spec before quoting.
What are typical lead times?
Prototype and first-article parts usually ship in 5-10 business days. Production runs from existing tooling are 2-3 weeks depending on volume and material lead time. Rush and expedite options available on a case-by-case basis.
Need custom Graphite gaskets?
From prototype to production, any shape, any volume.
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ISO 9001 CertifiedAS9100-ReadyMIL-Spec CompatibleFDA / USP Class VIEst. 1971ISO 9001 CertifiedAS9100-ReadyMIL-Spec CompatibleFDA / USP Class VIEst. 1971ISO 9001 CertifiedAS9100-ReadyMIL-Spec CompatibleFDA / USP Class VIEst. 1971ISO 9001 CertifiedAS9100-ReadyMIL-Spec CompatibleFDA / USP Class VIEst. 1971