ASTM C676-2019 pdf free download
ASTM C676-2019 pdf free download.Standard Test Method for Detergent Resistance of Ceramic Decorations on Glass Tableware
1. Scope
1.1 This qualitative test method is designed to provide a convenient and reproducible method of determining the deter- gent resistance of decorations applied to glass tableware. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.3 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definition: 3.2 detergent resistance—the degree of resistance to the chemical action of detergents.
4. Significance and Use
4.1 This test method provides a means of estimating the qualitative performance of glass enamel decorations that are exposed to high phosphate detergents during use. This test method also attempts to simulate accelerated exposure to high phosphate detergents prior to testing for heavy metal release, such as in Test Method C927 when long term performance of enamels must be evaluated.
5. Apparatus
5.1 Test Chamber—A thermostatically controlled tank, pref- erably stainless steel, that will maintain a solution temperature of 60 6 2°C. 5.2 Specimen Holder—A device for supporting the speci- mens to be evaluated in such a manner as to ensure free and unobstructed contact between the decoration and the test solution.
6. Test Specimens
6.1 Test specimens consist of representative glass tableware with ceramic decorations.
7. Test Solution
7.1 Prepare a test solution consisting of 5 % sodium pyro- phosphate (Na 4 P 2 O 7 ·10H 2 O) and 95 % distilled water.
8. Procedure
8.1 Immerse the samples for 2-h periods in the test solution maintained at 60 6 2°C. Retain a duplicate piece of ware with each decoration under test without exposure to the solution as an aid in judging the degree of chemical action on the specimens under test. At the end ofthe 2-h periods, remove the specimens from the solution, rub vigorously with a cloth under running water, dry, and evaluate. 8.2 Grade the decorations after each 2-h period of immer- sion in accordance with one of the following classes: Class 1—No loss of gloss. Class 2—Gloss loss, no loss of opacity. Class 3—Noticeable loss of opacity. Class 4—Complete removal of decoration.
9. Interpretation of Results
9.1 Grade the decorations after each 2-h period of immer- sion in accordance with one of the following classes: Grade 1—No attack apparent.Grade 2—Appearance of iridescence or visible stain on the exposed surface when viewed at a 45° angle but not apparent at angles less than 30°. Grade 3—A definite stain which does not blur reflected images and is visible at angles less than 30°. Grade 4—Definite stain with a gross color change or strongly iridescent surface visible at angles less than 30° and which may blur reflected images. Grade 5—Surface dull or matte with chalking possible. Grade 6—Significant removal of enamel with pinholing evident. Grade 7—Complete removal of enamel in exposed area.
10. Report
10.1 Report the following information: 10.1.1 Identification of the specimen tested, including deco- rating material used and maturing cycle used, 10.1.2 Grading of the specimens into the classes above after each 2-h period of immersion, and 10.1.3 Date of test and name of operator conducting test.
