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  • Flexible Graphite Gaskets
Flexible Graphite Gaskets

Flexible Graphite Gaskets

Flexible Graphite Gaskets

Flexible Graphite Gaskets - Once considered as a specialty gasket material for extreme temperature and chemical services, Flexible Graphite Sheet Gasket material can now be found in more typical applications. Flexible graphite has emerged as an affordable option for the majority of applications due to today's economies of scale and increased competition. The primary reason for an increased demand in flexible graphite is due to its ability to replace a wide range of gasket materials. This increases safety and simplicity when selecting the correct material for the job. What was once an expensive and complicated decision for choosing gasket materials, is now an easy and affordable choice thanks to flexible graphite. The graphite sheets are available with an anti-stick coating that avoids sticking, aides in easy gasket removal, and keeps the flanges cleaner. The anti-stick properties are independent of temperature and stress, and the cost of the coating is insignificant when compared to the cost of cleaning the flanges.


Flexible Graphite Gasket Common Applications

High Temp applications - Flexible Graphite seals in applications to 850°F with absolute confidence. Flexible graphite may still be applicable when conditions exceed 850°F.


This is possible for two reasons:

    1) An oxidation inhibitor is present in some grades of flexible graphite, this provides capability of sealing up to 900°F.

    2) The combination of heat and oxygen are the first thing to attack flexible graphite, not heat itself.

Flexible graphite can withstand up to 5,400°F as long as oxygen is not present. At 850°F and above it’s a sliding scale. In applications with steam or any other reduced oxygen atmosphere flexible graphite will handle 1200°F. If you have any questions or doubts about your application please contact us at support@aspseal.com.


Flexible Graphite can now seal chemical applications previously only sealed by Kalrez, Viton, Chemrez, PTFE, or Gylon. However, the ability for flexible graphite to seal these chemicals is dependent upon the amount of pressure applied. Sulfuric acid and Nucleic acids are used to produce flexible graphite, therefore reintroducing it to those chemicals can also break it down.


Steam Applications? Flexible Graphite will seal it!

Note: When using flexible graphite on stem flanges, be aware that while the steam is sealed, due to flexible graphite’s conductivity characteristics it can appear to "sweat" (but not leak) in humid areas.

Oil and Gas was once always sealed with non-asbestos gasket materials. While non-asbestos does a good job, flexible graphite gasket material does a better job! EQMD, Air quality leakage rates control is met every day by refineries around the world using flexible graphite. Like most materials, it is possible to replace non-asbestos with flexible graphite in the interest of standardizing on one material.


Flexible Graphite NOT Recommended Applications:

Do not use flexible graphite sheet gasket material for Food, FDA, NSF, or any application where graphite contamination could be an issue. Flexible graphite will particle transfer. It’s carbon, so it will act like a lead pencil.


Flexible Graphite Gasket Material

Flexible graphite made from material typically 98% graphite. Leachable chloride typically less than 50 ppm. Sulfur content: 1200 ppm. Compressibility: 45% Recovery: 20%. Creep relaxation: 5%. Density: 62.4 lbs/ft. Tensile strength: 700 PSI. Temperature range (oxidizing atmosphere): -400°F to 750°F.


Flexible Graphite Products


FlexiGraf FGS1

Flexible graphite laminate reinforced with a pure nickel foil core. The minimum temperature peak is -328°F. The maximum temperature peak is 1022°F. Creep relaxation is less than or equal to 5%. Compressibility is between 30 and 45%. Recovery is between 3 and 7%.


FlexiGraf FGS3

Flexible graphite laminate reinforced with a tanged stainless steel core. The properties of this material replicate those of FlexiGraf FGS1, however the FGS3 can tolerate slightly more pressure.


FlexiGraf FGS4

Flexible graphite laminate reinforced with a flat stainless steel core. The properties of this material also replicate those of FlexiGraf FGS1.


FlexiGraf FGS1200

Flexible graphite laminate reinforced with a pure alluminum alloy core. The properties of this material are similar to the FGS1,2, and 4. The main difference is the amount pressure this product can tolerate. The FGS1200 can withstand a maximum operating pressure of 1450 PSI.


Flexigraf Multiflex HTP

Flexible graphite laminate reinforced with a tanged stainless steel multilayers core. The properties of this material replicate those of the FlexiGraf family. The MultiFlex HTP has a higher maximum operating pressure, withstanding pressure up to 4350 PSI.


Flexigraf Multiflex

Flexible graphite laminate reinforced with a flat stainless steel multilayers core. This material has identical properties of the MultiFlex HTP. The only differences are the color of the material and its flat stainless steel.


FlexiGraf Unigraph 500

This material is composed of flexible graphite based with polymer coating on both sides. The material can withstand a minimum temperature of -328°F and a maximum temperature of 842°F. The UNIGRAPH 500 can tolerate a maximum operating pressure of 1450 PSI. Creep relaxation is less than or equal to 8%. Compressibility is 40-50%. Recovery is 3-7%.


Flexigraf Unigraph 500 HD

This product is identical to the UNIGRAPH 500. The only differences are its density: 1,3 - 1,5 (g/cm³) and its compressibility: 25-35%.


FlexiGraf Unimetal

This material is composed of flexible graphite based wire mesh reinforced with polymer coating on both sides. The UNIMETAL can withstand a minimum temperature of -328°F and a maximum temperature of 842°F. The material can tolerate a maximum operating pressure at 2175 PSI. Creep relaxation is less than or equal to 8%. Compressibility is between 40-50%. Recovery is between 3-7%.


316 S.S. Foil Inserted Flexible Graphite Material

Flexible graphite sheet reinforced with a 316 stainless steel foil (0.002” thick) made from material typically 98% graphite. Leachable chloride typically less than 50 ppm. Sulfur content: 400 ppm. Compressibility: 35%. Recovery: 18%. Creep relaxation: 12%. Density: 62.4 lbs/ft. Tensile strength: 5000 PSI. Temperature range (oxidizing atmosphere): -400°F to 750°F.


316 S.S. Foil Inserted Flexible Graphite Gasket Material

Flexible graphite sheet laminate gasket material with tang 316 stainless steel insert (0.005” thick) made from material typically 98% graphite. Leachable chloride typically less than 50 ppm. Sulfur content: 400 ppm. Compressibility: 35%. Recovery: 18%. Creep relaxation: 10%. Density: 62.4 lbs/ft. Tensile strength: 5000 PSI. Temperature range (oxidizing atmosphere): -400°F to 750°F.


Flexible Graphite Ribbon Pack Series

This product is mechanical grade 99-99.5% pure graphite ribbon. This ribbon-pack has properties of self-lubrication, corrosive resistant, and can safely operate at all temperatures. The flexible graphite ribbon-pack is simple to install, endures high pressures, and dispels heat. The ribbon-pack is available in several thicknesses & widths for your application.

The ribbon-pack can operate at temperatures between -400°F and 3000°F (in non-oxidizing atmospheres). The temperature range is -400°F to 850°F in oxidizing atmospheres and can reach 1200°F in steam.


Ribbon-pack Styles:

    Flexible Graphite SG63 - 99% pure graphite ribbon
    Nuclear Grade Flexible Graphite SG64 - 99.5% pure graphite ribbon
    Flexible Graphite w/ Adhesive Back SG63 A - 99.0% pure graphite ribbon with pressure sensitive adhesive (PSA) backing.
    Nuclear Grade Flexible Graphite w/ Adhesive Back SG64A - Nuclear grade 99.5% pure graphite ribbon with pressure sensitive adhesive (PSA) backing.

 

 

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