1、Designation: C 375 58 (Reapproved 2006)Standard Classification ofWater Used in Milling of Porcelain Enamel1This standard is issued under the fixed designation C 375; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This classification covers water used in the milling ofporcelain enamel frit.2. Referenced Documents2.1 ASTM Standards:2D5
3、11 Test Methods for Calcium and Magnesium In WaterD 512 Test Methods for Chloride Ion In WaterD 513 Test Methods for Total and Dissolved Carbon Diox-ide in WaterD 516 Test Method for Sulfate Ion in WaterD 858 Test Methods for Manganese in WaterD 1068 Test Methods for Iron in WaterD 1126 Test Method
4、for Hardness in WaterD 1293 Test Methods for pH of WaterD 1888 Methods of Test for Particulate and DissolvedMatter in Water3D 3370 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. Fo
5、r porce-lain enamel frits, Class A water should 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. Method
6、s of Analysis4.1 Determine the elements and properties listed in Table 1in accordance with the following ASTM methods:4.1.1 SamplingPractices D 3370.4.1.2 BicarbonateTest Methods D 513.4.1.3 Calcium and MagnesiumTest Methods D511.4.1.4 ChlorideTest Methods D 512.4.1.5 HardnessTest Method D 1126.4.1.
7、6 IronTest Methods D 1068.4.1.7 ManganeseTest Methods D 858.4.1.8 pHTest Methods D 1293.4.1.9 SulfateTest Method D 516.4.1.10 Total SolidsTest Methods D 1888.1This classification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatings and is the direct responsibility of Sub
8、committeeB08.12 on Materials for Porcelain Enamel and Ceramic-Metal Systems.Current edition approved April 1, 2006. Published April 2006. Originallyapproved in 1955. Last previous edition approved in 1999 as C 375 58 (1999).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcont
9、act ASTM Customer Service at serviceastm.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 Intern
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13、ards, at the address shown below.This 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 610-8
14、32-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).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 7.3C 375 58 (2006)2
