ASTM C824-91(1996)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: C 824 – 91 (Reapproved 1996)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Specimen Preparation for Determination of Linear Thermal
Expansion of Vitreous Glass Enamels and Glass Enamel
Frits by the Dilatometer Method
This standard is issued under the fixed designation C 824; 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
1.1 This practice covers the preparation of vitreous glass
enamels and glass enamel frit specimens for the measurement
of linear thermal expansion using Test Method E 228.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.
1.3 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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For specific hazard
statements, see Section 6.
2. Referenced Documents
2.1 ASTM Standards:
E 228 Test Method for Linear Thermal Expansion of Solid
Materials With a Vitreous Silica Dilatometer
3. Significance and Use NOTE 1—Material: No. 316 stainless steel.
FIG. 1 Powder Pressing Die
3.1 The dilatometer method of measuring linear thermal
expansion of vitreous glass enamels and glass enamel frits has
4.4 Scale or Caliper, capable of measuring the length of the
the advantage of simplicity, lends itself to automatic, self-
test specimen to an accuracy of 0.1 %.
recording arrangements, and requires test specimens of simple
5. Reagents and Materials
configuration.
5.1 Hydroxypropyl Cellulose Solution in Water (1 weight%
4. Apparatus
).
4.1 Powder Pressing Die, whose top and bottom sections
5.2 Powder Sample.
are free to move such that density variations within the bar are
minimized (see Fig. 1). 6. Hazards
4.2 Hydraulic Press.
6.1 Appropriate ventilation should be provided when han-
4.3 Furnace, for firing test specimen, electrically heated and
dling powdered frits or enamels containing toxic ingredients.
controlled to a minimum rate of heating of 1°C/min from room
6.2 Ingestion or inhalation of test materials should be
temperature to the maximum temperature of the test. It shall be
avoided. Protective clothing such as gloves, respirators, etc.,
...