ASTM C673-97(2008)

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

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Summary

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.

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	Al₂O₃, %

High-duty	31	NR^A
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.

Technical characteristics

Publisher	American Society for Testing and Materials (ASTM International)
Publication Date	11/10/1997
Confirmation Date	08/01/2008
Collection
Page Count	2
Themes	Refractories
EAN	---
ISBN	---
Weight (in grams)	---