ASTM C673-97(2008)

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

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
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.
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.

General Information

• Status: Historical
• Publication Date: 31-Jul-2008
• ICS: 81.080 - Refractories
• Technical Committee: C08 - Refractories
• Drafting Committee: C08.92 - The Joseph E. Kopanda Subcommittee for Editorial, Terminology and Classification

Relations

• Replaces: ASTM C673-97(2003) - Standard Classification of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes
• Effective Date: 01-Aug-2008
• Replaced By: ASTM C673-97(2013) - Standard Classification of Fireclay and High-Alumina Plastic Refractories and Ramming Mixes
• Effective Date: 01-Sep-2013
• Referred By: ASTM C1054-18 - Standard Practice for Pressing and Drying Refractory Plastic and Ramming Mix Specimens
• Effective Date: 01-Aug-2008

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C673 −97(Reapproved2008)
Standard Classification of
Fireclay and High-Alumina Plastic Refractories and
1
Ramming Mixes
This standard is issued under the fixed designation C673; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Classifications
1.1 This classification covers fireclay and high-alumina 4.1 Fireclay plastic refractories and ramming mixes are
plastic refractories and ramming mixes that can be pounded or divided into two different classifications: (1) super-duty, and
rammed into place to form a monolithic structure. The terms (2) high-duty.
“plastic” and“ ramming mix” are generally intended to de-
4.2 High-alumina plastic refractories and ramming mixes
scribe the workability of the material. In this regard, plastics
are divided into eight different classifications: (1) 60 % alu-
are considered to be materials having a workability index of
mina, (2) 65 % alumina, (3) 70 % alumina, (4) 80 % alumina,
more than 15 % in accordance with Test Method C181, while
(5) 85 % alumina, (6) 90 % alumina, (7) 95 % alumina, and (8)
ramming mixes generally have less than 15 % workability by
100 % alumina.
the same procedure.
5. Basis of Classification
2. Referenced Documents
2 5.1 The properties required for compliance with a particular
2.1 ASTM Standards:
classification are shown in Table 1.
C24 Test Method for Pyrometric Cone Equivalent (PCE) of
Fireclay and High Alumina Refractory Materials
6. Test Methods
C181 Test Method for Workability Index of Fireclay and
High-Alumina Refractory Plastics 6.1 The determination of aluminum oxide (Al O)onan
2 3
ignition-free basis, as required by this classification, as deter-
NOTE 1—Chemical analysis of refractory products are determined by a
mined by XRF and ICP.
combination of x-ray fluorscence (XRF) and inductively coupled plazma
(ICP) using standard reference materials (SRM); including various types
6.2 The determination of the pyrometric cone equivalent
of minerals and refractory materials which are available from the National
(PCE), as required by this classification, shall be in accordance
Institute of Standards and Technology and other appropriate sources.
with Test Method C24.
3. Significance and Use
7. Retests
3.1 This classification defines a group of classes for use by
those producing or purchasing fireclay and high-alumina plas- 7.1 Because of possible variables that may result from
tic refractories and ramming mixes. Each class is limited by
sampling or an unsatisfactory reproducibility of tests by dif-
PCE, or alumina content, or both. This classification is fre- ferent laboratories, the material may be resampled and retested
quently used as a specification when the properties shown in at the request of either the purchaser or the manufacturer. This
Table 1 are the only it
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