1、Designation: C 724 91 (Reapproved 2005)Standard Test Method forAcid Resistance of Ceramic Decorations on Architectural-Type Glass1This standard is issued under the fixed designation C 724; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revi
2、sion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers qualitative determination of theacid resistance of the ceramic decoration o
3、n architectural glass.1.2 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 appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior
4、to use.2. Terminology2.1 Definitions:2.1.1 architectural glassglass used in the building indus-try.3. Summary of Test Method3.1 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 % hydrochlori
5、cacid solution.4. Significance and Use4.1 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 quantita-tively and qualitatively.4.2 This test method provides a convenient control
6、 testduring the manufacture of the ware.4.3 This test method is suitable for specification acceptance.5. Reagent5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents shall conform to the specifications of the Commit-tee o
7、n Analytical Reagents of the American Chemical Society,where such specifications are available.2Other 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.5.2 Citric Acid Solution (1 +
8、9)Add 10 parts by mass ofreagent grade citric acid to 90 parts by mass of distilled water.Prepare fresh for each determination.5.3 Hydrochloric Acid Solution (1 + 9)Add 10 parts bymass of reagent grade concentrated hydrochloric acid (HCl)(36 to 38 %) to 90 parts by mass of distilled water.6. Procedu
9、re6.1 Place four drops of each acid solution on a separatelocation on the surface of the ceramic decoration of thearchitectural glass to be tested. Cover each spot with awatchglass to retard evaporation and prevent contamination.Acid should remain on the surface of the test specimen for 15min at 20
10、62C.6.2 After 15 min of exposure, wash the acid solutions(1 + 9) from the test specimen with tap water and allow it to airdry.7. Report7.1 Report the following information:7.1.1 The degree of attack by visual observation by gradingas follows:Grade 1No attack apparentGrade 2Appearance of iridescence
11、or visible stain on theexposed surface when viewed at a 45 angle but not apparentat angles less than 30Grade 3A definite stain which does not blur reflectedimages and is visible at angles less than 301This test method is under the jurisdiction of ASTM Committee C14 on Glassand Glass Products and is
12、the direct responsibility of Subcommittee C14.10 onGlass Decoration.Current edition approved Sept. 1, 2005. Published October 2005. Originallyapproved in 1974. Last previous edition approved in 2000 as C 724 91(2000).2Reagent Chemicals, American Chemical Society Specifications, AmericanChemical Soci
13、ety, Washington, DC. For suggestions on the testing of reagents notlisted by the American Chemical Society, see Analar Standards for LaboratoryChemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeiaand National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,MD.
14、1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Grade 4Definite stain with a gross color change orstrongly iridescent surface visible at angles less than 30 andwhich may blur reflected imagesGrade 5Surface dull or matte with chalking
15、 possibleGrade 6Significant removal of enamel with pinholingevidentGrade 7Complete removal of enamel in exposed area8. Precision and Bias8.1 PrecisionIn round-robin testing and evaluation, thebetween-laboratory precision for citric-acid resistance determi-nation was found to be 61 grade (95 % studen
16、ts t). Thewithin-laboratory precision for citric-acid resistance determi-nation is estimated at no greater than 61 grade.8.2 BiasNo justifiable statement can be made about thebias of this test method, because the subjective nature ofgrading may vary considerably among operators.9. Keywords9.1 acid r
17、esistance; architectural decorations; ceramicenamels; chemical durabilityASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity o
18、f any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments a
19、re invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not re
20、ceived a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C 724 91 (2005)2
