1、Designation:C37558(Reapproved 2016)Standard Classification ofWater Used in Milling of Porcelain Enamel1This standard is issued under the fixed designation C375;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision
2、.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONThis standard sets forth Class A,B,and C categories for water used for milling porcelain enamelbased on the concentrations of allowable
3、 contaminates and the quality requirements of the fired finish.1.Scope1.1 This classification covers water used in the milling ofporcelain enamel frit.2.Referenced Documents2.1 ASTM Standards:2D511 Test Methods for Calcium and Magnesium In WaterD512 Test Methods for Chloride Ion In WaterD513 Test Me
4、thods for Total and Dissolved Carbon Dioxidein WaterD516 Test Method for Sulfate Ion in WaterD858 Test Methods for Manganese in WaterD1068 Test Methods for Iron in WaterD1126 Test Method for Hardness in WaterD1293 Test Methods for pH of WaterD1888 Methods Of Test for Particulate and Dissolved Matter
5、in Water(Withdrawn 1989)3D3370 Practices for Sampling Water from Closed Conduits3.Classification3.1 Three classes of water are covered,based on themaximum impurity analyses as defined in Table 1.For porce-lain enamel frits,Class A water should cause no difficulties inthe production of a high quality
6、 finish.Class B water may beused by slight compensations in processing.Mill additionwater falling into Class C should be treated before use in orderto preclude faulty enamel production.4.Methods of Analysis4.1 Determine the elements and properties listed in Table 1in accordance with the following AS
7、TM methods:4.1.1 SamplingPractice D3370.4.1.2 BicarbonateTest Method D513.4.1.3 Calcium and MagnesiumTest Method D511.4.1.4 ChlorideTest Method D512.4.1.5 HardnessTest Method D1126.4.1.6 IronTest Method D1068.4.1.7 ManganeseTest Method D858.4.1.8 pHTest Method D1293.4.1.9 SulfateTest Method D516.4.1
8、.10 Total SolidsTest Method D1888.1This classification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatingsand is the direct responsibility of SubcommitteeB08.12 on Materials for Porcelain Enamel and Ceramic-Metal Systems.Current edition approved Nov.1,2016.Published Nov
9、ember 2016.Originallyapproved in 1955.Last previous edition approved in 2011 as C375 58(2011).DOI:10.1520/C0375-58R16.2For 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
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15、;or through the ASTM website(www.astm.org).Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center,222Rosewood Drive,Danvers,MA 01923,Tel:(978)646-2600;http:/ 1 Classification of Water for Use in Milling Porcelain EnamelClassMaximum Concentrations,ppmpHCalciumMagnesiumIronManganeseSulfateChlorideHardnessTotal SolidsBicarbonateA317.50.300.005251338.51471177.6B4310.00.621.051021853.0198867.5C5318.00.43.1051871.0284787.3C375 58(2016)2