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
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.
SDO | ASTM: ASTM International |
Document Number | C673 |
Publication Date | Aug. 1, 2008 |
Language | en - English |
Page Count | 2 |
Revision Level | 97(2008) |
Supercedes | |
Committee | C08.92 |