ASTM C724-91 (2020) pdf free.Standard Test Method for Acid Resistance of Ceramic Decorations on ArchitecturalType Glass.
This test method covers qualitative determination of theacid resistance of the ceramic decoration on architectural glass.The values stated in Sl units are to be regarded asstandard.No other units of measurement are included in thisstandard.
This standard does not purport to address all of thesafety concerns，if any, associated with its use. It is theresponsibility of the user of this standard to establish appropriate safety,health,and environmental practices and determine the applicability of regulatory limitations prior to use.This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards，Guides and Recommendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.
This test method qualitatively determines,by visualinspection, the degree of attack upon a ceramic decoration bya 10 % citric acid solution and a nominal 3.7 % hydrochloricacid solution.
This test method evaluates the quality and serviceabilityof a ceramic decoration on architectural type glass.The degreeof attack is determined using an acidic solution both quantitatively and qualitatively.
This test method provides a convenient control testduring the manufacture of the ware.This test method is suitable for specification acceptance.Reagent grade chemicals shall beused in all tests.Unless otherwise indicated, it is intended thatall reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society,where such specifications are available.Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.
Precision-In round-robin testing and evaluation，thebetween-laboratory precision for citric-acid resistance determination was found to be ±1 grade (95 % student’s t). Thewithin-laboratory precision for citric-acid resistance determination is estimated at no greater than ±1 grade.No justifiable statement can be made about thebias of this test method,because the subjective nature ofgrading may vary considerably among operators.ASTM C724 pdf download.