1、Designation: C375 58 (Reapproved 2011)1Standard 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 r
2、evision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEStandard was editorially corrected in April 2011INTRODUCTIONThis standard sets forth Class A, B, and C categories for water used fo
3、r milling porcelain enamelbased on the concentrations of allowable 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 Magne
4、sium In WaterD512 Test Methods for Chloride Ion In WaterD513 Test Methods for Total and Dissolved Carbon Diox-ide in 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
5、 pH of WaterD1888 Methods of Test for Particulate and Dissolved Mat-ter in Water3D3370 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 sho
6、uld cause no difficulties inthe production of a high quality 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
7、properties listed in Table 1in accordance with the following ASTM 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 D
8、858.4.1.8 pHTest Method D1293.4.1.9 SulfateTest Method D516.4.1.10 Total SolidsTest Method D1888.1This classification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatings and is the direct responsibility of SubcommitteeB08.12 on Materials for Porcelain Enamel and Ceramic
9、-Metal Systems.Current edition approved April 1, 2011. Published April 2011. Originallyapproved in 1955. Last previous edition approved in 2006 as C375 58 (2006).DOI: 10.1520/C0375-58R11E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at servi
10、ceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM International takes no position respecti
11、ng the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard 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 stand
12、ard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif 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 Internation
13、al Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, 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.T
14、his 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
15、), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Classification of Water for Use in Milling Porcelain EnamelClassMaximum Concentrations, ppmpHCalcium Magnesium Iron Manganese Sulfate Chloride Hardness Total Solids BicarbonateA 31 7.5 0.30 0.005 25 13 38.5 147 117 7.6B 43 10.0 0.62 1.05 102 18 53.0 198 86 7.5C 53 18.0 0.43 . 105 18 71.0 284 78 7.3C375 58 (2011)12
