ASTM C467-97

Standard Classification of Mullite Refractories

SCOPE
1.1 This classification covers refractory products consisting predominantly of mullite (3 Al2O3[dot]2 SiO2) crystals that are formed by either converting any of the sillimanite group of minerals, or synthesizing from appropriate materials in a melt or sinter process.

General Information

• Status: Historical
• Publication Date: 09-Nov-1997
• Technical Committee: C08 - Refractories
• Drafting Committee: C08.92 - The Joseph E. Kopanda Subcommittee for Editorial, Terminology and Classification

Relations

• Replaced By: ASTM C467-97(2002) - Standard Classification of Mullite Refractories
• Effective Date: 10-Nov-1997

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 467 – 97
Standard Classification of
Mullite Refractories
This standard is issued under the fixed designation C 467; 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.
1. Scope meet the following requirements:
Alumina content, % 56 to 79
1.1 This classification covers refractory products consisting
A
Impurities, max, % 5
predominantly of mullite (3 Al O ·2 SiO ) crystals that are
B
2 3 2
Deformation, max, % 5
formed by either converting any of the sillimanite group of
A
Impurities refer to metal oxides other than those of aluminum and silicon.
minerals, or synthesizing from appropriate materials in a melt
B
When tested in accordance with 6.1.2.
or sinter process.
5. Test Specimens
2. Referenced Documents
5.1 Testing for compliance with this classification shall be
2.1 ASTM Standards:
1 1
performed on 9 by 4 ⁄2 by 2 ⁄2-in. (228 by 114 by 64-mm)
C 16 Test Method for Load Testing Refractory Brick at
rectangular brick as made, or on specimens of this size cut
High Temperatures
from larger shapes, utilizing existing plane surfaces as much as
NOTE 1—Chemical analysis of refractory products are determined by a
possible.
combination of x-ray fluorscence (XRF) and inductively coupled plazma
(ICP) using standard reference materials (SRM), including various types 6. Test Methods
of minerals and refractory materials which are available from the National
6.1 The properties enumerated in this classification shall be
Institute of Standards and Technology and other appropriate sources.
determined in accordance with the following ASTM meth-
C 832 Test Method of Measuring the Thermal Expansion
ods:
and Creep of Refractories Under Load
6.1.1 Alumina Content—XRF and ICP.
6.1.2 Load Test—Schedule 6 of Table 1 in Test Method
3. Significance and Use
C 16.
3.1 The mullite content of an alumina-silica refractory
6.1.3 Thermal Expansion and Creep—Method C 832.
material has an important influence on volume stability, load
bearing properties, and its satisfactory use in refractory appli-
7. Retests
cations. This classification is considered useful for purchase
7.1 Because of possible variables that may result from
specifications and quality control.
sampling or an unsatisfactory reproducibility of tests by
different laboratories, the material m
...