ASTM C724-91(2000)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:C724–91(Reapproved 2000)
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 tee onAnalytical Reagents of theAmerican Chemical Society,
where such specifications are available. Other grades may be
1.1 This test method covers qualitative determination of the
used, provided it is first ascertained that the reagent is of
acid resistance of the ceramic decoration on architectural glass.
sufficiently high purity to permit its use without lessening the
1.2 This standard does not purport to address all of the
accuracy of the determination.
safety concerns, if any, associated with its use. It is the
5.2 Citric Acid Solution (1 + 9)—Add 10 parts by mass of
responsibility of the user of this standard to establish appro-
reagent grade citric acid to 90 parts by mass of distilled water.
priate safety and health practices and determine the applica-
Prepare fresh for each determination.
bility of regulatory limitations prior to use.
5.3 Hydrochloric Acid Solution (1 + 9)—Add 10 parts by
2. Terminology mass of reagent grade concentrated hydrochloric acid (HCl)
(36 to 38 %) to 90 parts by mass of distilled water.
2.1 Definitions:
2.1.1 architectural glass—glass used in the building indus-
6. Procedure
try.
6.1 Place four drops of each acid solution on a separate
3. Summary of Test Method location on the surface of the ceramic decoration of the
architectural glass to be tested. Cover each spot with a
3.1 This test method qualitatively determines, by visual
watchglass to retard evaporation and prevent contamination.
inspection, the degree of attack upon a ceramic decoration by
Acid should remain on the surface of the test specimen for 15
a 10 % citric acid solution and a nominal 3.7 % hydrochloric
min at 20 62°C.
acid solution.
6.2 After 15 min of exposure, wash the acid solutions
4. Significance and Use
(1 + 9) from the test specimen with tap water and allow it to air
dry.
4.1 This test method evaluates the quality and serviceability
of a ceramic decoration on architectural type glass. The degree
7. Report
of attack is determined using an acidic solution both quantita-
7.1 Report the following information:
tively and qualitatively.
7.1.1 The degree of attack by visual observation by grading
4.2 This test method provides a convenient control test
as follows:
during the manufacture of the ware.
Grade 1—No attack apparent
4.3 This test method is suitable for specification acceptance.
Grade 2—Appearance of iridescence or visible stain on the
5. Reagent
exposed surface when viewed at a 45° angle but not apparent
at angles less than 30°
5.1 Purity of Reagents—Reagent grade chemicals shall be
Grade 3—A definite stai
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