Flexible Graphite Physical & Mechanical Properties

 MinGraphTM 2010A & 2010B Grade Homogeneous Flexible Graphite

Physical and Mechanical Properties

Typical Properties Related to Sealing Applications

Tensile Strength: 725 psi (4.9 Mpa)
Compressive Strength (ASTM C-695): 35000 psi / 240 MPa (Through Thickness)
Compressibility (ASTM F-36): 43%

Recovery (ASTM F36): 15%
Creep Relaxation (ASTM F-38): < 5%

Sealability (ASTM F-37): 0.017 fluid oz/hr ( 0.5 ml/hr)

Working Temperature Range:

Oxidizing Medium(such as air): -400º F to 950º F (-240ºC to 510ºC)
Mild Oxidizing Medium of most gasket applications (such as steam): -400º F to 1500º F(-240ºC to 850º C)
Non-oxidizing Medium: -400º F to 5400º F(-240ºC to 3000º C)

Other Physical Properties of Flexible Graphite

(Information from independent research labs as reference purpose only)

Thermal Conductivity:

Through Thickness (“c”) 36 BTU·in/ft2·h·F (5 W/m·K)

Parallel to Surface(“a”) 960 BTU·in/ft2·h·F (140 W/m·K)

Thermal Expansion:

Through Thickness (“c”) 70°F to 4000°F (21°C to 2206°C) 15 x 10-6 in/in·F (27 x 10-6 m/m·°C)

Parallel to Surface (“a”) 70°F to 2000°F (21°C to 1094°C) -0.2 x 10-6 in/in·F (-0.4 x 10-6 m/m·°C);

2000°F to 4000°F(1094°C to 2206°C) 0.5 x 10-6 in/in·F (0.9 x 10-6 m/m·°C)

Electrical Resistivity (Density 70 lbs/cu.ft, load 0 psi, room temperature):

Through Thickness (“c”) 15 Ω·m,

Parallel to Surface (“a”) 7 x 10-3Ω·m

Coefficient of Friction (against Steel): @ 4 psi (0.03 MPa) 0.018; @ 8 psi (0.06 MPa) 0.052; @ 12 psi (0.08 MPa) 0.157

Modulus of Elasticity: 0.2 x 106 psi (1380 MPa)

Young’s Compressive Modulus(Through Thickness): 27000 psi (186 MPa)

Nuclear Radiation Resistance:
5.5 x 1021 NVT @ 1000°C No Apparent Effect
1.5 x 109 rads Gamma Radiation(1.5 x 1011 erg/g) No Apparent Effect
(N= Neutrons/cc V= cm/sec T= Seconds)

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2 comments on “Flexible Graphite Physical & Mechanical Properties
  1. Avijit Das says:

    What is the chemical process used for making these flexible graphite sheets??

    • charlesz says:

      MinGraph flexible graphite is manufactured by chemically treating natural graphite flake to form a compound Graphite Bisulfate with and between the layers of the hexagonal graphite atomic structure (intercalation). The intercalated graphite is then exfoliated (expanded) by rapid heating process. Finally the exfoliated graphite is compressed or calendered into sheet form.

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