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ASTM C735-2019 pdf free download

ASTM C735-2019 pdf free download.Standard Test Method for Acid Resistance of Ceramic Decorations on Returnable Beer and Beverage Glass Containers
1. Scope
1.1 This test method covers qualitative determination of the acid resistance of ceramic decorations on returnable beer and beverage containers, to assure the necessary durability of the decoration. 1.2 This test provides an indication of performance when and ifthe decoration is to be exposed to the acid solutions used in reclaiming bottles, and it also covers those instances where the beverages themselves have acidic properties. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. 1.5 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.
4. Significance and Use
4.1 This test method evaluates the quality and serviceability of ceramic decorations on returnable beer and beverage con- tainers. 4.2 This test method is also suitable for specification accep- tance. Its significance is that bottles with good acid resistance coatings have longer service life.
5. Reagent
5.1 Hydrochloric Acid (27 + 73)—Dilute 27 volumes of concentrated hydrochloric acid (HCl, sp gr 1.19) with 73 volumes of distilled water. This will produce nominal 11.5 weight % HCl. The volume of the solution may be varied as needed.
6. Test Specimen
6.1 The decorated ware should be representative of the lot, or run, and should be taken in accordance with the principles stated in Practice C224.
7. Procedure
7.1 Pour the HCl (27 + 73) into a beaker large enough to accept all of the test specimen and the reference sample. Keep this solution at room temperature (25 6 5°C). 7.2 Place the test specimen into the HCl so that approxi- mately one half of the label is immersed, and cover the beaker. 7.3 Remove the specimen from the HCl after 20 min. Rinse with water and dry. 7.4 Record the temperature ofthe HCl at both the beginning and the end of the test period. 7.5 Retain a duplicate piece of ware with each decoration under test, without exposure to HCl as an aid in judging the degree of chemical attack on the specimens under test. 8. Interpretation of Results 8.1 Judge the degree of the HCl attack on the decorated surface by visually comparing the exposed specimen to the nonexposed specimen, if such is available. 8.2 Grade the decoration on the test specimen according to 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°. 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. 8.3 Reference ware is a decorated, returnable beer or beverage container of known acid resistance.
9. Report
9.1 Report the following information: 9.1.1 Identification of the ware, the decorating material used, and the firing cycle used, 9.1.2 Test solution temperature at both the beginning and the end of the test period, 9.1.3 Grading of the specimens and the reference sample as in 8.2, and 9.1.4 Date of test and name of operator conducting test.

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