1、Designation:C55616Standard Test Method forResistance of Overglaze Decorations to Attack byDetergents1This standard is issued under the fixed designation C556;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()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method2covers the determination and evalua-tion of the resistance of overglaze decorations on ceramicwhitewares to attack by nor
3、mal household soaps and liquiddetergents under normal household conditions.1.2 This test method applies primarily to overglaze decora-tions applied to dinnerware for domestic use wherein house-hold soaps and detergents are used for cleaning the soiled wareby either hand or machine operations.1.3 The
4、 values stated in SI units are to be regarded asstandard.The inch-pound units given in parentheses are forinformation only.1.4 This standard may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety problems associated with its use.It isthe r
5、esponsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitation prior to use.2.Significance and Use2.1 This test method provides an indication of service lifeunder detergent exposure.3.Apparatus3.1 Stainless Steel
6、 Beaker,4 L(4.2 qt)capacity,fitted with astainless steel lid.3.2 Stainless Steel Supports to hold specimens off thebottom of the beaker.3.3 Steam Bath or other heating device capable of maintain-ing bath temperature at 95 6 1.1C(203 6 2F).4.Reagents and Materials4.1 Sodium Carbonate Solution made by
7、 dissolving anhy-drous sodium carbonate in distilled water in the ratio of 5 g ofsodium carbonate per litre(1.14 qt)of water.4.2 Clean Muslin Cloth.5.Sampling5.1 Whole pieces or segments of ware are selected so as tobe representative of the decoration to be tested.6.Test Specimens6.1 The size of the
8、 specimens shall be such that the ratio ofthe total surface area of three specimens to volume of testsolution shall be not greater than 100 cm2(15.5 in.2)of surfaceto 3 L(3.2 qt)solution.Four identical specimens(identical asto decoration,not necessarily as to size or shape)are requiredfor each test.
9、7.Procedure7.1 Place the stainless steel specimen support in the bottomof the 4-L(4.2-qt)stainless steel beaker,and pour 3 L(3.2 qt)of sodium carbonate standard test solution into the beaker.Cover the beaker and let it remain covered throughout the testexcept for brief intervals when temperature mea
10、surements aremade or when specimens are inserted or withdrawn.Place thebeaker on the steam bath or other heat source,and heat the testsolution to 95 6 1.1C(203 6 2F)throughout the test.NOTE1The mean temperature at which this test must be conducted isjust below(approximately 1C(or 2F)the boiling poin
11、t of water.If thetest is conducted at altitudes above sea level,appropriate adjustmentshould be made where steam baths are not used.7.2 Degrease the specimens just prior to testing by washingin warm distilled water,rinsing with acetone until the surfacefilms uniformly with distilled water,rinsing fi
12、nally with freshacetone,and then air drying.When the test solution hasreached temperature,insert three of the specimens in thebeaker in such a manner that they are completely covered withsolution and do not overlap each other.7.3 After 2 h,remove one specimen from the beaker and rubthe decorated are
13、a vigorously with a bit of muslin cloth,fourplies thick,which has been dampened with test solution.Rinse1This test method is under the jurisdiction ofASTM Committee C21 on CeramicWhitewares and Related Products and is the direct responsibility of SubcommitteeC21.03 on Methods for Whitewares and Envi
14、ronmental Concerns.Current edition approved July 1,2016.Published July 2016.Originally approvedin 1965.Last previous edition approved in 1988 as C556 88 which was withdrawnin July 1994 and reinstated in July 2016.DOI:10.1520/C0552-16.2This test method has been adapted from the FB2C test method devel
15、oped by theUnited States Potters Association.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the rubbed specimen in distilled water at not less than 82C(180F)and then air dry.Retain the muslin cloth for the record.7.4 Leave the other two
16、test specimens in the beaker attemperature for an additional 2 h after which remove a secondspecimen from the beaker and rub with fresh muslin inaccordance with 6.1.Leave the third test specimen in thebeaker at temperature for another 2-h period;then remove itand rub with fresh muslin in accordance with 7.3.7.5 Examine the three exposed specimens visually forerosion of the decoration;use the unexposed specimen as astandard for comparison.Examine the muslin cloths used forrubbing for evidence of
