ASTM-D5377 › Standard Classification for Rubber Compounding Materials—Ground Coal
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1.1 This classification covers the compounding material known as ground coal. It is generally used in rubber compounds as a filler.
1.2 There are three grades of ground coal based on particle size, ash, and moisture. The selected values for these properties are suitable for use in a rubber compound.
Significance and Use
3.1 Ground coal is commonly used as an inexpensive filler in rubber compounds as a direct or partial replacement for carbon black or as a diluent in the compound.
3.2 Ground coal is very compatible with most rubbers and is very easily mixed into the compound.
filler; ground coal
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1993 R17 EDITION
March 15, 2017