ASTM C724-91(1996)
(Test Method)Standard Test Method for Acid Resistance of Ceramic Decorations on Architectural-Type Glass
Standard Test Method for Acid Resistance of Ceramic Decorations on Architectural-Type Glass
SCOPE
1.1 This test method covers qualitative determination of the acid resistance of the ceramic decoration on architectural glass.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: C 724 – 91 (Reapproved 1996)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
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Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Acid Resistance of Ceramic Decorations on Architectural-
Type Glass
This standard is issued under the fixed designation C 724; 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 where such specifications are available. Other grades may be
used, provided it is first ascertained that the reagent is of
1.1 This test method covers qualitative determination of the
sufficiently high purity to permit its use without lessening the
acid resistance of the ceramic decoration on architectural glass.
accuracy of the determination.
1.2 This standard does not purport to address all of the
5.2 Citric Acid Solution (1 + 9)—Add 10 parts by mass of
safety concerns, if any, associated with its use. It is the
reagent grade citric acid to 90 parts by mass of distilled water.
responsibility of the user of this standard to establish appro-
Prepare fresh for each determination.
priate safety and health practices and determine the applica-
5.3 Hydrochloric Acid Solution (1 + 9)—Add 10 parts by
bility of regulatory limitations prior to use.
mass of reagent grade concentrated hydrochloric acid (HCl)
2. Terminology (36 to 38 %) to 90 parts by mass of distilled water.
2.1 Definitions:
6. Procedure
2.1.1 architectural glass—glass used in the building indus-
6.1 Place four drops of each acid solution on a separate
try.
location on the surface of the ceramic decoration of the
3. Summary of Test Method architectural glass to be tested. Cover each spot with a
watchglass to retard evaporation and prevent contamination.
3.1 This test method qualitatively determines, by visual
Acid should remain on the surface of the test specimen for 15
inspection, the degree of attack upon a ceramic decoration by
min at 20 62°C.
a 10 % citric acid solution and a nominal 3.7 % hydrochloric
6.2 After 15 min of exposure, wash the acid solutions
acid solution.
(1 + 9) from the test specimen with tap water and allow it to air
4. Significance and Use
dry.
4.1 This test method evaluates the quality and serviceability
7. Report
of a ceramic decoration on architectural type glass. The degree
7.1 Report the following information:
of attack is determined using an acidic solution both quantita-
7.1.1 The degree of attack by visual observation by grading
tively and qualitatively.
as follows:
4.2 This test method provides a convenient control test
Grade 1—No attack apparent
during the manufacture of the ware.
Grade 2—Appearance of iridescence or visible stain on the
4.3
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