Значение и использование

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-duty31NR^A Super-duty32½NR 60 % alumina3557.6 to 62.5 65 % alumina35-3662.6-67.5 70 % alumina3667.6 to 72.5 80 % alumina3777.6 to 82.5 85 % aluminaNR82.6 to 87.5 90 % aluminaNR87.6 to 92.5 95 % aluminaNR92.6 to 97.5 100 % aluminaNR>97.5

^A NR = not required.

Область применения

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, while ramming mixes generally have less than 15 % workability by the same procedure.