ASTM C370-12(2020)
(Test Method)Standard Test Method for Moisture Expansion of Fired Whiteware Products
Standard Test Method for Moisture Expansion of Fired Whiteware Products
SIGNIFICANCE AND USE
2.1 This test method provides means to determine increases in physical dimension of fired whiteware materials which develop from the reaction of water and water vapor at elevated pressures and temperatures. These reactions can occur in time at normal atmospheric pressures and temperatures; changes in physical dimensions from water can influence the integrity and stability of an installation. In the case of glazed ware, moisture expansion can lead to crazing.
SCOPE
1.1 This test method covers the determination of the elongation of whiteware bodies caused by rehydration as a result of autoclave treatment.
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
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: C370 − 12 (Reapproved 2020)
Standard Test Method for
Moisture Expansion of Fired Whiteware Products
This standard is issued under the fixed designation C370; 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 3.2 Micrometer, at least 3 to 4 in. (76 to 102 mm), reading
to 0.0001 in. (0.003 mm), or a dial indicator graduated in
1.1 This test method covers the determination of the elon-
0.0001-in. increments.
gationofwhitewarebodiescausedbyrehydrationasaresultof
3.3 Fixture, for mounting the micrometer or dial indicator
autoclave treatment.
and for holding the specimen in such a manner that reproduc-
1.2 This standard does not purport to address all of the
ible results can be obtained. A fused silica reference shall be
safety concerns, if any, associated with its use. It is the
used to calibrate the fixture before each measurement.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4. Test Specimen
mine the applicability of regulatory limitations prior to use.
4.1 The specimens shall be unglazed, rod-like in shape,
1.3 This international standard was developed in accor-
about 3 to 4 in. (76 to 102 mm) long, and preferably cut from
dance with internationally recognized principles on standard-
the center of production pieces of ware. The greatest thickness
ization established in the Decision on Principles for the
shallnotexceed0.75in.(19mm),andtheleastdimensionshall
Development of International Standards, Guides and Recom-
be not less than 0.10 in. (2.5 mm).
mendations issued by the World Trade Organization Technical
4.2 The specimens shall be cut to size and measured
Barriers to Trade (TBT) Committee.
immediately after coming from the kiln or shall be stored in a
desiccator until they can be cut and measured.
2. Significance and Use
4.3 The ends of the specimens shall be cut perpendicular to
2.1 This test method provides means to determine increases
the length and parallel to each other. They then shall be
in physical dimension of fired whiteware materials which
smoothed with emery cloth and, finally, with jeweler’s rouge.
develop from the reaction of water and water vapor at elevated
4.4 At least five specimens shall be tested.
pressures and temperatures. These reactions can occur in time
at normal atmospheric pressures and temperatures; changes in
5. Procedure
physical dimensions from water can influence the integrity and
5.1 Markthespecimensforidentificationandmeasurethem
stability of an installation. In the case of glazed ware, moisture
with the micrometer or the dial indicator to the nearest
expansion can lead to crazing.
0.0001 in. (0.003 mm). Apply a reference mark to the speci-
mens for orientation in the measuring fixture.
3. Apparatus
5.2 Locate the specimens above the water in the autoclave
3.1 Autoclave, that can safely be operated at 150 psi
and subject them to 150-psi (1 MPa) steam pressure for 5 h.
(1 MPa), and that has sufficient capacity to contain at least five
Maximumpressureshallbereachedinnotlessthan45minnor
specimens. The apparatus shall be equippe
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