ASTM C401-91(2000)
(Classification)Standard Classification of Alumina and Alumina-Silicate Castable Refractories
Standard Classification of Alumina and Alumina-Silicate Castable Refractories
SCOPE
1.1 This classification pertains to alumina and alumina-silicate castable refractories that, when tempered with water, will develop structural strength by chemical action.
1.2 The values in inch-pound units are to be regarded as the standard. The values in parentheses are provided for information only.
1.3 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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Designation: C 401 – 91 (Reapproved 2000)
Standard Classification of
Alumina and Alumina-Silicate Castable Refractories
This standard is issued under the fixed designation C 401; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4. Basis of Classification
1.1 This classification pertains to alumina and alumina- 4.1 Regular Castable Refractories—This class includes
silicate castable refractories that, when tempered with water, alumina and alumino-silicate castable refractories which con-
will develop structural strength by chemical action. tain hydraulic-setting cement and which have a total lime
1.2 The values in inch-pound units are to be regarded as the (CaO) content greater than 2.5 % on a calcined basis. Under
standard. The values in parentheses are provided for informa- this class, castables having a modulus of rupture after drying of
tion only. at least 300 psi (2.07 MPa) are normal-strength, and those
1.3 This standard does not purport to address the safety having at least 600 psi (4.14 MPa) modulus of rupture are
concerns, if any, associated with its use. It is the responsibility high-strength types. They are further classified on the basis of
of the user of this standard to establish appropriate safety and volume stability of cast test brick when fired at the tempera-
health practices and determine the applicability of regulatory tures prescribed in Table 1.
limitations prior to use. 4.2 Low-Cement Castable Refractories—This class in-
cludesaluminaandalumino-silicatecastablerefractorieswhich
2. Referenced Documents
contain hydraulic-setting cement and which have a total lime
2.1 ASTM Standards:
(CaO) content of greater than 1.0 to 2.5 % on a calcined basis.
C 113 Test Method for Reheat Change of Refractory Brick 4.3 Ultra-Low Cement Castable Refractories—This class
C 133 Test Methods for Cold Crushing Strength and Modu-
includes alumina and alumino-silicate castable refractories
lus of Rupture of Refractories which contain hydraulic-setting cement and which have a total
C 134 Test Methods for Size, Dimensional Measurements,
lime (CaO) content of greater than 0.2 to 1.0 % on a calcined
and Bulk Density of Refractory Brick and Insulating
basis.
Firebrick 4.4 No-CementCastableRefractories—Thisclassincludes
C 862 Practice for Preparing Refractory Concrete Speci-
aluminaandalumino-silicatecastablerefractorieswhichdonot
mens by Casting contain hydraulic-setting cement and in which the bonding
C 865 Practice for Firing Refractory Concrete Specimens
agent(s) contribute no significant amount of lime (CaO). The
product might contain up to 0.2 % total lime (CaO) on a
3. Significance and Use
calcined basis as contributed by the aggregate.
3.1 Alumina and alumina-silicate castable refractories are
4.5 Insulating Castable Refractories—This class includes
produced to yield property characteristics commensurate with
insulating castable refractories which are classified on the basis
different end use properties. Volume stability, modulus of
of bulk density of dried cast test brick and volume stability of
rupture, bulk density, and lime content have become useful
such test brick when fired at the temperatures prescribed in
measures to distinguish various alumina and alumina-silicate
Table 2.
castable formulations for initial fitness for service. This clas-
5. Test Methods
sification is considered useful for purchase specifications and
for quality control. 5.1 The properties enumerated in this classification shall be
determined in accordance with the following ASTM methods:
5.1.1 Modulus of Rupture—Test Methods C 133 on test
This classification is under the jurisdiction of ASTM Committee C08 on
brick with Practice C 862, and after oven-drying in accord
...
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