ASTM C455-97(1999)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C 455 – 97 (Reapproved 1999)
Standard Classification of
Chrome Brick, Chrome-Magnesia Brick, Magnesia-Chrome
Brick, and Magnesia Brick
This standard is issued under the fixed designation C 455; 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 distinct classes based on a nominal and minimal value for
magnesium oxide content. Chrome brick are treated as a
1.1 This classification categorizes machine-made refractory
separate class without reference to magnesium oxide content.
brick defined as chrome brick, chrome-magnesia brick,
Such classes have historically been generally useful in relating
magnesia-chrome brick, and magnesia brick (see 3.1). It does
the defined types to specific industrial applications and in
not cover products made from electrically fused magnesium
developing product or purchasing specifications.
oxide or to products made by fusion casting. Its purpose is to
describe classes distinguished by obvious differences in mag-
5. Basis of Classification
nesium oxide (MgO) content except for chrome brick.
5.1 Chrome-magnesia brick, magnesia-chrome brick, and
1.2 This standard does not purport to address all of the
magnesia brick are classified by MgO content as shown in
safety concerns, if any, associated with its use. It is the
Table 1. Chrome brick is not classified by MgO content (see
responsibility of the user of this standard to establish appro-
Table 1).
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Test Methods
2. Referenced Documents 6.1 The determination of MgO on an ignited basis as
required by this classification shall be determined by a com-
2.1 ASTM Standards:
bination of x-ray fluorescence (XRF) and inductively coupled
C 71 Terminology Relating to Refractories
plazma (ICP) using standard reference materials (SRM), in-
NOTE 1—Chemical analysis of refractory products are determined by a
cluding various types of minerals and refractory materials
combination of x-ray fluorscence (XRF) and inductively coupled plazma
which are available from the National Institute of Standards
(ICP) using standard reference materials (SRM), including various types
and Technology and other appropriate sources.
of minerals and refractory materials which are available from the National
Institute of Standards and Technology and other appropriate sources.
7. Retests
3. Terminology
7.1 Because of variables resulting from sampling and the
lack of satisfactory reproducibility in tests conducted by
3.1 For definitions of terms used in this classification, see
different laboratories, the material may be resampled and
Terminology C 71.
retested when requested b
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