ASTM C824-91(2010)

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Designation: C824 − 91(Reapproved 2010)
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 C824; 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 4.2 Hydraulic Press.
1.1 This practice covers the preparation of vitreous glass 4.3 Furnace,forfiringtestspecimen,electricallyheatedand
controlled to a minimum rate of heating of 1°C/min from room
enamels and glass enamel frit specimens for the measurement
of linear thermal expansion using Test Method E228. temperature to the maximum temperature of the test. It shall be
so designed that the temperature variation over the length of
1.2 The values stated in SI units are to be regarded as the
the test specimen shall be less than 2°C during the entire range
standard. The values given in parentheses are for information
of heating.
only.
4.4 Scale or Caliper, capable of measuring the length of the
1.3 This standard does not purport to address all of the
test specimen to an accuracy of 0.1 %.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Reagents and Materials
priate safety and health practices and determine the applica-
5.1 Hydroxypropyl Cellulose Solution in Water
bility of regulatory limitations prior to use. For specific hazard
(1 weight% ).
statements, see Section 6.
5.2 Powder Sample.
2. Referenced Documents
6. Hazards
2.1 ASTM Standards:
6.1 Appropriate ventilation should be provided when han-
E228 Test Method for Linear Thermal Expansion of Solid
dling powdered frits or enamels containing toxic ingredients.
Materials With a Push-Rod Dilatometer
6.2 Ingestion or inhalation of test materials should be
avoided. Protective clothing such as gloves, respirators, etc.,
3. Significance and Use
may be advisable. If ingestion occurs, seek medical attention
3.1 The dilatometer method of measuring linear thermal
immediately.
expansion of vitreous glass enamels and glass enamel frits has
6.3 Caution should be exercised when placing specimens in
the advantage of simplicity, lends itself to automatic, self-
furnaces. Tongs and insulated gloves should be used. To avoid
recording arrangements, and requires test specimens of simple
accidental contact and serious thermal burns, care should be
configuration.
takentoguardhot-firedspecimenswhiletheyarebeingcooled.
4. Apparatus
7. Test Specimen Preparation
4.1 Powder Pressing Die, whose top and bottom sections
7.1 Collect vitreous glass enamel or glass enamel frit
are free to move such that density variations within the bar are
particles within the 60 to 200 mesh particle size range and
minimized (see Fi
...