ASTM C370-88(1999)
(Test Method)Standard Test Method for Moisture Expansion of Fired Whiteware Products
Standard Test Method for Moisture Expansion of Fired Whiteware Products
SCOPE
1.1 This test method covers the determination of the elongation of whiteware bodies due to rehydration as a result of autoclave treatment.
1.2 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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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Designation:C370–88(Reapproved 1999)
Standard Test Method for
Moisture Expansion of Fired Whiteware Products
This standard is issued under the fixed designation C 370; 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 the center of production pieces of ware. The greatest thickness
shallnotexceed0.75in.(19mm),andtheleastdimensionshall
1.1 This test method covers the determination of the elon-
be not less than 0.10 in. (2.5 mm).
gationofwhitewarebodiescausedbyrehydrationasaresultof
4.2 The specimens shall be cut to size and measured
autoclave treatment.
immediately after coming from the kiln or shall be stored in a
1.2 This standard does not purport to address all of the
desiccator until they can be cut and measured.
safety concerns, if any, associated with its use. It is the
4.3 The ends of the specimens shall be cut perpendicular to
responsibility of the user of this standard to establish appro-
the length and parallel to each other. They then shall be
priate safety and health practices and determine the applica-
smoothed with emery cloth and, finally, with jeweler’s rouge.
bility of regulatory limitations prior to use.
4.4 At least five specimens shall be tested.
2. Significance and Use
5. Procedure
2.1 This test method provides means to determine increases
5.1 Mark the specimens for identification and measure them
in physical dimension of fired whiteware materials which
with the micrometer or the dial indicator to the nearest 0.0001
develop from the reaction of water and water vapor at elevated
in. (0.003 mm). Apply a reference mark to the specimens for
pressures and temperatures. These reactions can occur in time
orientation in the measuring fixture.
at normal atmospheric pressures and temperatures; changes in
5.2 Locate the specimens above the water in the autoclave
physical dimensions from water can influence the integrity and
and subject them to 150-psi (1-MPa) steam pressure for 5 h.
stability of an installation.
Maximumpressureshallbereachedinnotlessthan45minnor
3. Apparatus
more than 1 h.After the 5-h treatment, immediately release the
steam pressure by opening the blow-off valve.
3.1 Autoclave, that can safely be operated at 150 psi (1
5.3 After removal from the autoclave, dry the specimens to
MPa), and that has sufficient capacity to contain at least five
constantweightatatemperaturenotexceeding110°Candcool
specimens. The apparatus shall be equipped with a safety
them to room temperature.
valve, a pressure gage accurate within 2 % of the scale range,
5.4 Measure the dry specimens to the nearest 0.0001 in.
and a source of heat of sufficient capacity to ensure a constant
(0.003 mm) on the micrometer or dial indicator. To minimize
steam pressure within the autoclave.
errors of measurement caused by the expansion of the speci-
3.2 Micrometer,3to4in.(76to102mm),readingto0.0001
men, the temperatu
...
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