ASTM C155-97

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C 155 – 97
Standard Classification of
Insulating Firebrick
This standard is issued under the fixed designation C 155; 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.
TABLE 1 Grouping of Insulating Firebrick
1. Scope
1.1 This classification covers heat insulating material
Reheat Change, Not Bulk Density
known as insulating firebrick. This material is suitable for
Group More Than 2 % Not Greater
No. When Tested at Than lb/ft
lining certain kinds of industrial furnaces.
°F (°C) (g/cm )
NOTE 1—Insulating materials for use below 1000°F (538°C) are
16 1550 (845) 34 (0.54)
covered by ASTM Committee C-16 on Thermal Insulation.
20 1950 (1065) 40 (0.64)
23 2250 (1230) 48 (0.77)
26 2550 (1400) 54 (0.86)
2. Referenced Documents
28 2750 (1510) 60 (0.96)
2.1 ASTM Standards:
30 2950 (1620) 68 (1.09)
32 3150 (1730) 95 (1.52)
C 134 Test Methods for Size, Dimensional Measurements,
33 3250 (1790) 95 (1.52)
and Bulk Density of Refractory Brick and Insulating
Firebrick
C 210 Test Method for Reheat Change of Insulating Fire-
brick
5. Test Methods
3. Significance and Use
5.1 The properties enumerated in this classification shall be
determined in accordance with the following ASTM test
3.1 This classification establishes an orderly grouping of
methods:
insulating firebrick to provide group identifications for use by
5.1.1 Bulk Density—Test Methods C 134.
those producing or purchasing these materials. The group
5.1.2 Reheat Change—Test Method C 210. For the purpose
identification number is not meant to specifically designate the
of this classification, the percentage of reheat change shall be
maximum service temperature although the number times 100
obtained from only the 9-in. (228-mm) dimension of the test
does approximate the temperature (in degrees Fahrenheit) to be
brick.
used to check the reheat change and can be used as a guide for
relative temperature stability. The bulk density limits the
6. Retests
weight per unit volume for any group as sold, but is not meant
6.1 Because of variables resulting from sampling and the
to be used for detailed engineering calculations.
lack of satisfactory reproducibility in tests conducted by
4. Basis of Classification
different laboratories, the material may be resampled and
retested when requested by either the manufacturer or the
4.1
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