ASTM C455-07(2022)
(Classification)Standard Classification of Chrome, Chrome-Magnesia, Magnesia-Chrome, and Magnesia Brick
Standard Classification of Chrome, Chrome-Magnesia, Magnesia-Chrome, and Magnesia Brick
SIGNIFICANCE AND USE
4.1 This classification categorizes the defined types of refractory brick, with the exception of chrome brick, into distinct classes based on a nominal and minimal value for magnesium oxide content. Chrome brick are treated as a separate class without reference to magnesium oxide content. Such classes have historically been generally useful in relating the defined types to specific industrial applications and in developing product or purchasing specifications.
SCOPE
1.1 This classification categorizes machine-made refractory brick defined as chrome, chrome-magnesia, magnesia-chrome, and magnesia brick (see 3.1). It does not cover products made from electrically fused magnesium oxide or products made by fusion casting. Its purpose is to describe classes distinguished by obvious differences in magnesium oxide (MgO) content except for chrome brick.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C455 −07 (Reapproved 2022)
Standard Classification of
Chrome, Chrome-Magnesia, Magnesia-Chrome, and
Magnesia Brick
This standard is issued under the fixed designation C455; 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. Significance and Use
1.1 This classification categorizes machine-made refractory
4.1 This classification categorizes the defined types of
brick defined as chrome, chrome-magnesia, magnesia-chrome,
refractory brick, with the exception of chrome brick, into
and magnesia brick (see 3.1). It does not cover products made
distinct classes based on a nominal and minimal value for
from electrically fused magnesium oxide or products made by
magnesium oxide content. Chrome brick are treated as a
fusion casting. Its purpose is to describe classes distinguished
separate class without reference to magnesium oxide content.
by obvious differences in magnesium oxide (MgO) content
Such classes have historically been generally useful in relating
except for chrome brick.
the defined types to specific industrial applications and in
1.2 This standard does not purport to address all of the developing product or purchasing specifications.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Basis of Classification
priate safety, health, and environmental practices and deter-
5.1 Chrome-magnesia, magnesia-chrome, and magnesia
mine the applicability of regulatory limitations prior to use.
brick are classified by MgO content as shown in Table 1.
1.3 This international standard was developed in accor-
Chrome brick is not classified by MgO content (see Table 1).
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
6. Test Methods
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
6.1 The determination of MgO on an ignited basis as
Barriers to Trade (TBT) Committee.
required by this classification shall be determined by a com-
bination of X-ray fluorescence (XRF) and inductively coupled
2. Referenced Documents
plasma (ICP) using standard reference materials (SRM), in-
2.1 ASTM Standards:
cluding various types of minerals and refractory materials
C71 Terminology Relating to Refractories
which are available from the National Institute of Standards
NOTE 1—Chemical analysis of refractory product is determined by a and Technology and other appropriate sources.
combination of X-ray fluorscence (XRF) and inductively coupled plasma
(ICP) using standard reference materials (SRM), including various types
7. Retests
of minerals and refractory materials which are available from the National
Institute of Standards and Technology and other appropriate sources.
7.1 Because of variables resulting from sampling and the
lack of satisfactory reproducibility in tests conducted by
3. Terminology
diff
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