ASTM C724 Acid Resistance of Ceramic Decoration on Architectural Glass

ASTM C724 test method is used in analyzing the quality and ease of maintenance of a ceramic decoration on architectural-type glass. This test method is useful in the acknowledgment of technical standards.

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    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. 


    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.


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


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