Flexible Graphite Gaskets
Nothing seals better than gaskets made of graphite!
Graphite Gaskets Seal High Temperatures
Flexible Graphite Gaskets –
Once considered as a specialty gasket material for extreme temperature and chemical services, Flexible Graphite gaskets can now be found in more common applications. Flexible graphite has become a far more affordable gasket material. The drop in cost is attributable to today’s economies of scale and increased competition.
Reduced costs and increased leakage regulations are the primary reasons for increased demand in flexible graphite. Graphite gaskets increase the simplicity of selecting the correct gasket for the job. Due to flexible graphites wide range of temperature and chemical compatibility it is ideal for the majority of industrial applications.
What was once an expensive and complicated decision for choosing gasket materials, is now an easy and affordable choice thanks to flexible graphite.
What are common FLEXIBLE GRAPHITE GASKET applications?
Flexible Graphite gaskets can be used in most applications. Graphite is exceptional for High Temp applications, or applications that must be sealed well. – Flexible Graphite seals in applications to 850°F with absolute confidence. Flexible graphite may still be applicable up to 5,400 F if no oxygen is present. If you have an application that exceeds 950 F and has oxygen present, consider Mica Gaskets (up to 1800 F)
This is possible for two reasons:
1) An oxidation inhibitor is present in some grades of flexible graphite, this provides the capability of sealing up to 950°F.
2) The combination of heat and oxygen are the first thing to attack flexible graphite, not heat itself.
At 850°F and above the temperature resistance is a sliding scale. In applications with steam or any other reduced oxygen atmosphere flexible graphite will handle 1200°F. The less oxygen, the higher the temperature resistance. If you have any questions or doubts about your application please contact us at support@aspseal.com.
Flexible Graphite gaskets can 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.
AS&P FLEXIBLE GRAPHITE GASKET MATERIAL
We offer our own Graphite gasket material products from which we sell sheet gasketing and cut gaskets.
Flexible graphite made from our material is 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. Temperature range (oxidizing atmosphere): -400°F to 850°F. – Up to 5,400 in non-oxidizing atmosphers.
AS&P HOMOGENEOUS FLEXIBLE GRAPHITE MATERIAL – SWGTB
Flexible graphite sheet made from material typically 98% graphite. Leachable chloride typically less than 50 ppm. Compressibility: 35%. Recovery: 18%. Creep relaxation: 12%. Density: 62.4 lbs/ft. Minimal tensile strength. Available laminated up to 1/4″ thick.
AS&P 316 S.S. FOIL INSERTED FLEXIBLE GRAPHITE MATERIAL – SWGHR
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.
AS&P 316 S.S. TANG INSERTED FLEXIBLE GRAPHITE GASKET MATERIAL – SWGHE
Flexible graphite sheet laminate gasket material with tang 316 stainless steel insert (0.004” 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.
Durlon Flexible Graphite
FGS95 – Homogeneous Flexible Graphite
FGL316 – Laminated Flexible Graphite with SS Foil
FGT316 – Flexible Graphite with SS Tang insert
FGM316 – Multiple layers of .004″ SS foil for added pressure resistance
Uniflex Flexible Graphite Products
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%.
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.
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 aluminum alloy core. The properties of this material are similar to the FGS1,2, and 4. The main difference is the amount of pressure this product can tolerate. The FGS1200 can withstand a maximum operating pressure of 1450 PSI.
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.
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.
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%.
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%.
This material is composed of flexible graphite based wire mesh reinforced with a 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%.
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.
FLEXIBLE GRAPHITE Gaskets are not recommended for:
Do not use flexible graphite gaskets 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 as a lead pencil.
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