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About Graphite

There are two types of graphite used in the industry: natural graphite and synthetic graphite. Natural graphite is a naturally occurring element and it is used mainly as a lubricant, carbon additive and pencil lead. Synthetic graphite is a petroleum based composite material used in a variety of applications requiring superior to natural graphite properties. Synthetic graphite is also called artificial graphite, and is classified by a method of manufacturing and/or by production stage. There are four methods of manufacturing synthetic graphite: extrusion, vibration molding, compression molding and isostatic molding. There are also four production stages: baking, graphitization, purification and impregnation. The combination of methods of manufacturing and production stages determines the future properties of graphite. Manufacturing graphite is a lengthy and expensive process. However, the result of this process is a material offering a combination of some very unique properties:

  • Excellent electrical conductivity
  • Good thermal shock resistance
  • High mechanical strength
  • Low coefficient of thermal expansion
  • Low coefficient of friction
  • Superb chemical resistance

Typical Grades of Graphite

Method
of Manufacturing
Grade Density Particle size Hardness S T R E N G T H Resistivity CTE Temp. Porosity Ash
Compressive Flexural Tensile
gr/cm3 inch scleroscope psi psi psi ohm/in in/in/F F % %
EXTRUDED GR030 1.72 0.03 65 6,100 2,800 1,700 0.0003 2.5 750 22 0.1
GR030PI 1.74 0.03 65 6,500 2,950 1,800 0.0003 2.5 750 18 0.1
GR060 1.66 0.06 55 5,400 2,200 1,200 0.0003 2.5 750 23 0.5
GR060PI 1.70 0.06 55 5,700 2,300 1,350 0.0003 2.5 750 16 0.5
GR125 1.55 0.125 50 4,900 1,900 800 0.0003 2.5 750 24 0.5
COMPRESSION
MOLDED
MC-01 1.83 0.003 100 37,000 10,000 n/a n/a 2.6 500 1 0.5
MC-03 1.78 0.003 65 20,000 7,500 n/a n/a 2.5 500 10 0.1
MC-01RO 1.85 0.003 95 27,500 8,500 n/a n/a 2.5 1,100 1 0.5
MC-03M 2.40 0.003 75 30,000 11,000 n/a n/a 3.7 500 1 n/a
ISOSTATICALLY
PRESSED
CM-00 1.81 0.0003 75-80 20,000 8,000 n/a 0.001 2.8 800 10 0.02
CGM-1 1.55 0.0007 50 8,000 4,500 n/a 0.001 1.8 800 15 0.1
GM-10 1.82 0.0004 65 17,000 8,500 n/a 0.00055 2.5 800 9 0.05
GM-11 1.87 0.0004 80 20,000 9,500 n/a 0.00055 2.5 800 8 0.05

Disclaimer: This information presents typical properties only and is intended to provide general description of our products and their uses. It should not be construed as guaranteeing specific values or grade suitability for a particular application.


Typical Graphite Applications

Application Product
Electrical, Electrochemical, Electronic, EDM, Semiconductor Brushes, Anodes, Cathodes, Current Collectors, Sliding Contacts, EDM Electrodes, Resistors, Brazing Tips, Heaters, Seed Holders
Metallurgical Trays & Boats, Crucibles, Fluxing (Degassing) Tubes, Molds & Dies, Furnace Parts, Foundry Accessories, Canisters & Aluminum Extrusion Boards
Chemical Vessels and Reactors, Bushings & Bearings, Packing Rings & Seals, Roller Guides, Valves, Rotors & Vanes
Aerospace Rocket Nozzles
Nuclear High Purity Structural Components, Reflectors, Moderators

Carbon Fiber

Our carbon fiber reinforced carbon/graphite is an alternative material of choice where traditional graphite and carbon/graphite fails. This is achieved by the carbon fiber reinforcement that adds substantially high stiffness, strength and fracture toughness to carbon/graphite while retaining all the unique properties of graphite. Thus it provides a cost-effective solution for design and performance improvement that was not possible with traditional carbon/graphite material. Our materials can be customized to provide optimized physical and chemical attributes to suit your needs such as Silicon carbide surfacing to have increased abrasion and oxidation resistance for your harsh environment applications.

Properties Carbon fiber reinforced 
carbon/graphite
Graphite
Density (gm/cc) 1.7 1.7
Strength (MPa) 150 80
Stiffness (GPa) 50-200 10-20
Thermal expansion (ppm/C) 1 to 5 6
Thermal conductivity (W/m-K) 40-150 100
Fracture toughness (MPa-m1/2) 10-15 2

When application requires extended performance, we recommend using our carbon fiber materials to make products such as piston rings, crucibles, vanes and wear plates.

We can manufacture flat plates, solid rounds and cylinders in sizes ranging from 1/16" to 5" (plate or wall thickness) by 18" Square.

SALES & ENGINEERING

600 Academy Drive
Suite 100
Northbrook, IL 60089, USA
Phone: (847) 279-1925
Fax: (847) 279-1926
support@graphtek.com
MANUFACTURING

219 Hope Rd.
Smithfield, PA 15478 
USA

Carretera a Laredo KM 16.5 C.P. 66604
Colonia Moisés Sáenz
Apodaca, Nuevo León 
Mexico

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