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ASTM C673-97(2008)

Historical Reaffirmation

Standard Classification of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes

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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.


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-duty31NRA
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.

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
Publish Date Document Id Type View
Nov. 10, 1997 C0673-97 Revision
Sept. 1, 2022 C0673-97R22 Reaffirmation
Oct. 1, 2018 C0673-97R18 Reaffirmation
Sept. 1, 2013 C0673-97R13 Reaffirmation
Aug. 1, 2008 C0673-97R08 Reaffirmation
April 10, 2003 C0673-97R03 Reaffirmation