Carbon Testing

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ASTM C454

Standard Test Method for Disintegration of Carbon Refractories by Alkali

Ten 2" cube specimens are required by ASTM. A 1" hole is drilled into the face of each specimen and filled with 8 gm of Potassium Carbonate. The effects of being fired at 1750°F for 5 hours are determined visually.

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ASTM C559

Standard Test Method for Bulk Density by Physical Measurements of Manufactured Carbon and Graphite Articles

The bulk density is determined using the specimen weight and dimensions.

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ASTM C561

Standard Test Method for Ash in a Graphite Sample

Ash content of graphite materials is determined by oxidation at 950°C. The ash content for two representative specimens per type/brand is determined.

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ASTM C611

Standard Test Method for Electrical Resistivity of Manufactured Carbon and Graphite Articles at Room Temperature

Electrical resistivity of carbon and graphite materials is determined by DC, as well as AC, methods. Specimens may be in the form of plates, rods, bars, or tubes.

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ASTM C651

Standard Test Method for Flexural Strength of Manufactured Carbon and Graphite Articles Using Four-Point Loading at Room Temperature

Flexural strength is determined in four-point bending on specimens of rectangular cross-section.

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ASTM C695

Standard Test Method for Compressive Strength of Carbon and Graphite
The compressive strength is determined on a right cylinder. The diameter of the specimen must be ten times the maximum particle size and the ratio of height to diameter must be between 1.9 and 2.1.

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ASTM C767

Standard Test Method for Thermal Conductivity of Carbon Refractories

The heat flow through a refractory is determined with a water-cooled copper calorimeter. The temperature limit of refractory must be specified, as well as the hot face or mean test temperatures desired. The maximum hot face temperature for testing is 2700°F. The specimens required are six 9" bricks or an 18" x 13.5" x 2.5" slab.

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ASTM C769

Standard Test Method for Sonic Velocity in Manufactured Carbon and Graphite Materials for Use in Obtaining Young's Modulus

Approximation of Young's Modulus is calculated through sonic velocity measurements in 3 directions. The velocity of sound waves is measured using a James V-meter.

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ASTM C838

Standard Test Method for Bulk Density of As-Manufactured Carbon and Graphite Shapes

Bulk density is calculated from weight and volume measurements.

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ASTM C1025

Standard Test Method for Modulus of Rupture in Bending of Electrode Graphite

Flexural strength is determined in four-point bending on 6" x 1 1/2" x 1 1/2" specimens.

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ASTM C1039

Standard Test Methods for Apparent Porosity, Apparent Specific Gravity, and Bulk Density of Graphite Electrodes

A vacuum is used to determine the apparent porosity, bulk density, liquid absorption, and apparent specific gravity. Testing of five specimens (2" diameter x 7 1/2" high) per type/brand is suggested by ASTM.

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