ASTM C673-97(2003)
(Classification)Standard Classification of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes
Standard Classification of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes
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, while ramming mixes generally have less than 15 % workability by the same procedure.
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Designation: C 673 – 97 (Reapproved 2003)
Standard Classification of
Fireclay and High-Alumina Plastic Refractories and
Ramming Mixes
This standard is issued under the fixed designation C 673; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
TABLE 1 Classification of Fireclay and High-Alumina Plastic
1. Scope
Refractories and Ramming Mixes
1.1 This classification covers fireclay and high-alumina
plastic refractories and ramming mixes that can be pounded or
Class PCE, min Al O ,
2 3
%
rammed into place to form a monolithic structure. The terms
A
“plastic” and“ ramming mix” are generally intended to de- High-duty 31 NR
Super-duty 32 ⁄2 NR
scribe the workability of the material. In this regard, plastics
60 % alumina 35 57.6 to 62.5
are considered to be materials having a workability index of
65 % alumina 35-36 62.6-67.5
more than 15 % in accordance with Test Method C 181, while 70 % alumina 36 67.6 to 72.5
80 % alumina 37 77.6 to 82.5
ramming mixes generally have less than 15 % workability by
85 % alumina NR 82.6 to 87.5
the same procedure.
90 % alumina NR 87.6 to 92.5
95 % alumina NR 92.6 to 97.5
2. Referenced Documents 100 % alumina NR >97.5
A
NR = not required.
2.1 ASTM Standards:
C 24 TestMethodforPyrometricConeEquivalent(PCE)of
2 4.2 High-alumina plastic refractories and ramming mixes
Fireclay and High-Alumina Refractory Materials
are divided into eight different classifications: (1) 60 % alu-
C 181 Test Method for Workability Index of Fireclay and
2 mina, (2) 65 % alumina, (3) 70 % alumina, (4) 80 % alumina,
High-Alumina Plastic Refractories
(5) 85 % alumina, (6) 90 % alumina, (7) 95 % alumina, and (8)
NOTE 1—Chemical analysis of refractory products are determined by a
100 % alumina.
combination of x-ray fluorscence (XRF) and inductively coupled plazma
(ICP) using standard reference materials (SRM); including various types
5. Basis of Classification
of minerals and refractory materials which are available from the National
5.1 The properties required for compliance with a particular
Institute of Standards and Technology and other appropriate sources.
classification are shown in Table 1.
3. Significance and Use
6. Test Methods
3.1 This classification defines a group of classes for use by
6.1 The determination of aluminum oxide (Al O )onan
those producing or purchasing fireclay and high-alumina plas- 2 3
ignition-free basis, as required by this classification, as deter-
tic refractories and ramming mixes. Each class is limited by
mined by XRF and ICP.
PCE, or alumina content, or both. This classification is fre-
6.2 The determination of t
...
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