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Last Updated: Sep 16, 2013
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ASTM C673-97(2008)
Standard Classification of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes
Standard Classification of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes
C0673-97R08
ASTM|C0673-97R08|en-US
Standard Classification of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes
Standard
C673 Standard Classification of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes>
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Significance and Use
This classification defines a group of classes for use by those producing or purchasing fireclay and high-alumina plastic refractories and ramming mixes. Each class is limited by PCE, or alumina content, or both. This classification is frequently used as a specification when the properties shown in Table 1 are the only items specified.
TABLE 1 Classification of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes
| Class | PCE, min | Al 2O3, % |
|---|---|---|
| High-duty | 31 | NRA |
| Super-duty | 32½ | NR |
| 60 % alumina | 35 | 57.6 to 62.5 |
| 65 % alumina | 35-36 | 62.6-67.5 |
| 70 % alumina | 36 | 67.6 to 72.5 |
| 80 % alumina | 37 | 77.6 to 82.5 |
| 85 % alumina | NR | 82.6 to 87.5 |
| 90 % alumina | NR | 87.6 to 92.5 |
| 95 % alumina | NR | 92.6 to 97.5 |
| 100 % alumina | NR | >97.5 |
A NR = not required.
Scope
1.1 This classification covers fireclay and high-alumina plastic refractories and ramming mixes that can be pounded or rammed into place to form a monolithic structure. The terms “plastic” and“ ramming mix” are generally intended to describe the workability of the material. In this regard, plastics are considered to be materials having a workability index of more than 15 % in accordance with Test Method C 181