ASTM C824-91(2015)

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C824 − 91 (Reapproved 2010) C824 − 91 (Reapproved 2015)
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
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 E228.
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 appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use. For specific hazard statements, see Section 6.
2. Referenced Documents
2.1 ASTM Standards:
E228 Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer
3. Significance and Use
3.1 The dilatometer method of measuring linear thermal expansion of vitreous glass enamels and glass enamel frits has the
advantage of simplicity, lends itself to automatic, self-recording arrangements, and requires test specimens of simple configuration.
4. Apparatus
4.1 Powder Pressing Die, whose top and bottom sections are free to move such that density variations within the bar are
minimized (see Fig. 1).
4.2 Hydraulic Press.
4.3 Furnace, for firing test specimen, electrically heated and controlled to a minimum rate of heating of 1°C/min from room
temperature to the maximum temperature of the test. It shall be so designed that the temperature variation over the length of the
test specimen shall be less than 2°C during the entire range of heating.
4.4 Scale or Caliper, capable of measuring the length of the test specimen to an accuracy of 0.1 %.
5. Reagents and Materials
5.1 Hydroxypropyl Cellulose Solution in Water
(1 weight% ).
5.2 Powder Sample.
6. Hazards
6.1 Appropriate ventilation should be provided when handling powdered frits or enamels containing toxic ingredients.
6.2 Ingestion or inhalation of test materials should be avoided. Protective clothing such as gloves, respirators, etc., may be
advisable. If ingestion occurs, seek medical attention immediately.
This practice is under the jurisdiction of ASTM Committee C14 on Glass and Glass Products and is the direct responsibility of Subcommittee C14.10 on Glass Decoration.
Current edition approved March 1, 2010May 1, 2015. Published May 2010May 2015. Originally
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