1、Designation: C 777 04Standard Test Method forSulfide Resistance of Ceramic Decorations on Glass1This standard is issued under the fixed designation C 777; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、 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 the qualitative determination ofthe sulfide resistance of ceramic decorations on glass to assurethe necessary
3、 durability of the decoration.1.2 This test method provides an indication of performancewhen and if the decorations are exposed to sulfide attack.1.3 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 stan
4、dard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.4 This test method generates hydrogen sulfide gas whichis highly poisonous.2. Referenced Documents2.1 ASTM Standards:2C 224 Practice for Sampling Glass Containers3. Su
5、mmary of Test Method3.1 One half of the specimens are immersed in a volume4 % acetic acid solution that contains 1 mL of saturated sodiumsulfide solution per each 100 mL of the acetic acid solution ina suitable covered container at room temperature. The degreeof attack is determined by visual observ
6、ation and physicaltesting of the specimen exposed to a hydrogen sulfide atmo-sphere.4. Apparatus4.1 Suitable Covered Container.4.2 Stirrer.4.3 Hot Plate.4.4 Pipet.4.5 Fume Hood, or other means of adequately exhaustingH2S produced during the test.5. Reagents5.1 Sodium Sulfide (Na2S9H2O), reagent grad
7、e.5.2 Acetic Acid (CH3COOH, min 99.8 %), reagent grade.6. Test Specimen6.1 The decorated ware should be representative of the lot,or run, and should be taken in accordance with the principlesstated in Practice C 224.6.2 Standard reference ware of known resistance must berun with each test.7. Prepara
8、tion of Test Solution7.1 Make a 4 % volume acetic acid solution by adding toeach 96 mL of distilled water 4 mL of acetic acid.7.2 Dissolve an excess amount of sodium sulfide in warm(35 to 40C) distilled water. Make sure there is undissolvedsodium sulfide left over. Cool to room temperature.7.3 Stir
9、into each 100 mL of the 4 % acetic acid solution 1mL of saturated, clear, sodium sulfide solution for 2 or 3 min.A milk of sulfur will precipitate.8. Procedure8.1 Place the test specimens and the reference standard ofknown resistance into the test solution prepared according to7.3 at room temperatur
10、e so that only half of the decoration isimmersed. Stir and cover.8.2 Remove specimens from solution after 15 min and allowto air dry.8.3 Note the degree of attack after 15 min by visualobservation and grade.8.4 Retain a duplicate piece of ware of each decorationunder test without exposure as an aid
11、in judging the degree ofattack on the specimens under test.9. Interpretation of Results9.1 Visual Inspection:9.1.1 Grade the decoration on the test specimen and refer-ence standard in accordance with one of the following visualtest grades:9.1.2 Visual Evaluation:Grade V1No attack apparent.1This test
12、 method is under the jurisdiction of ASTM Committee C14 on Glassand Glass Products , and was written by Subcommittee C14.10 on Glass Decorationin cooperation with the Society of Glass Decorators Committee A-20.Current edition approved Oct. 1, 2004. Published October 2004. Originallyapproved in 1974.
13、 Last previous edition approved in 1999 as C 777 93 (1999).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1C
14、opyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Grade V2Appearance of iridescence or visible stain on theexposed surface when viewed at a 45 angle but not apparentat angles less than 30.Grade V3A definite stain which does not blur refl
15、ectedimages and is visible at angles less than 30.Grade V4Definite stain with a gross color change orstrongly iridescent surface visible at angles less than 30 andwhich may blur reflected images.Grade V5Surface dull or matte and grossly discolored.9.2 Physical Testing of Stain:9.2.1 If a stain exist
16、s, grade the decoration on the testspecimen and reference standard in accordance with one of thefollowing physical test grades:9.2.2 Physical Testing of Stain:Grade P1Stain is easily removed by gently rubbing thehydrogen sulfide atmosphere exposed decoration with a drypaper towel.Grade P2Stain is no
17、t completely removed by gentlyrubbing the hydrogen sulfide atmosphere exposed decorationwith a dry paper towel, but can be removed by vigorousrubbing.Grade P3Stain cannot be completely removed by vigor-ous rubbing with a dry paper towel.10. Report10.1 Report the following information:10.1.1 Identifi
18、cation of the ware, the decorating materialused, and the firing cycle.10.1.2 Grading of the specimen and the reference standard.10.1.3 Date of test and name of operator conducting test.11. Precision and Bias11.1 No justifiable statement can be made regarding theprecision and bias of this test method
19、 since the degree of attackis determined with a subjective grading system.12. Keywords12.1 ceramic decorations; glass; sulfide resistanceASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this sta
20、ndard are expressly advised that determination of the validity of 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 an
21、dif not revised, either reapproved or withdrawn. Your comments are 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,
22、which you may attend. If you feel that your comments have not received 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).C777042
