ASTM C724 Acid Resistance of Ceramic Decoration on Architectural Glass

Scope:

ASTM C724 test method is used for determining the acid resistance of ceramic decoration on architectural glass in a qualitative manner. This test method qualitatively evaluates the degree of attack upon a ceramic decoration by a 10% citric acid solution and a nominal 3.7 % hydrochloric acid solution by visual assessment. This test method also provides an easy objective test that can be used during the production of the glassware.

Test Procedure:

For ASTM C724, four drops of each acid solution are dropped in a separate spot on the surface of the ceramic decoration to be tested. A watch glass is placed above each location to prevent evaporation and contamination. The test acid solution is left on the test specimen’s surface for about 15 minutes at 20°C ± 2°C. The acid solutions are rinsed off the test specimen with tap water and the test specimen is air-dried after 15 minutes of exposure.

Specimen Size : 

A typical architecture-type glass with ceramic decorations is used as an ASTM C676 test specimen. 

Data:

Analysis of the intensity of attack for ASTM C724 testing is done by using the following set of criteria:

▪ No signs of an attack.
▪ When viewed at a 45° angle, there is an appearance of stain on the surface, although it is not visible if the angle is less than 30°.
▪ A distinct stain that does not distort reflected light.
▪ Surface is dull or matte, with the possibility of chalking.

Conclusion:

ASTM C724 test method is used for determining the acid resistance of ceramic decoration on architectural glass in a qualitative manner.