ASTM C724-91(2020)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C724 − 91 (Reapproved 2020)
Standard Test Method for
Acid Resistance of Ceramic Decorations on Architectural-
Type Glass
This standard is issued under the fixed designation C724; 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 This test method provides a convenient control test
during the manufacture of the ware.
1.1 This test method covers qualitative determination of the
acid resistance of the ceramic decoration on architectural glass. 4.3 This test method is suitable for specification acceptance.
1.2 The values stated in SI units are to be regarded as
5. Reagent
standard. No other units of measurement are included in this
5.1 Purity of Reagents—Reagent grade chemicals shall be
standard.
used in all tests. Unless otherwise indicated, it is intended that
1.3 This standard does not purport to address all of the
all reagents shall conform to the specifications of the Commit-
safety concerns, if any, associated with its use. It is the
tee onAnalytical Reagents of theAmerican Chemical Society,
responsibility of the user of this standard to establish appro-
where such specifications are available. Other grades may be
priate safety, health, and environmental practices and deter-
used, provided it is first ascertained that the reagent is of
mine the applicability of regulatory limitations prior to use.
sufficiently high purity to permit its use without lessening the
1.4 This international standard was developed in accor-
accuracy of the determination.
dance with internationally recognized principles on standard-
5.2 Citric Acid Solution(1+9)—Add ten parts by mass of
ization established in the Decision on Principles for the
reagent grade citric acid to 90 parts by mass of distilled water.
Development of International Standards, Guides and Recom-
Prepare fresh for each determination.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5.3 Hydrochloric Acid Solution (1 + 9)—Add ten parts by
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, n—glass used in the building
6.1 Place four drops of each acid solution on a separate
industry.
location on the surface of the ceramic decoration of the
architectural glass to be tested. Cover each spot with a
3. Summary of Test Method
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
inspection, the degree of attack upon a ceramic decoration by
15 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 att
...