ASTM D7358-2007(2013) 0000 Standard Test Method for Water Content of Paints by Quantitative Calcium Hydride Reaction Test Kit《使用定量氢化钙反应试验盒测定水含量的标准试验方法》.pdf
《ASTM D7358-2007(2013) 0000 Standard Test Method for Water Content of Paints by Quantitative Calcium Hydride Reaction Test Kit《使用定量氢化钙反应试验盒测定水含量的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D7358-2007(2013) 0000 Standard Test Method for Water Content of Paints by Quantitative Calcium Hydride Reaction Test Kit《使用定量氢化钙反应试验盒测定水含量的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D7358 07 (Reapproved 2013)Standard Test Method forWater Content of Paints by Quantitative Calcium HydrideReaction Test Kit1This standard is issued under the fixed designation D7358; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f revision, the year of last revision. A 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 method describes the determination of the totalwater content of paints using a calci
3、um hydride reaction testkit, or water content between 2 and 85 % water.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use.
4、 It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD3925 Practice for Sampling Liquid Paint
5、s and RelatedPigmented CoatingsD4017 Test Method for Water in Paints and Paint Materialsby Karl Fischer MethodE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3. Summary of Test Method3.1 A0.25 mL sample is reacted with a specially formulatedcalcium h
6、ydride reagent to convert water in the sample tohydrogen gas. The reaction is carried out in a sealed pressurevessel and the resulting pressure is then measured using aspecially designed meter programmed to convert gas pressureinto water content. The results are displayed in milligrams ofwater in th
7、e reacted sample extract. The actual weight percentwater in the whole paint sample is manually calculated usingthe exact weights of the paint sample and the diluted extractsample, if used.4. Significance and Use4.1 Although Test Method D4017 is widely used for thedetermination of water in paints and
8、 related materials, thismethod may overcome some of the variability found in theKarl Fischer method.4.2 Control of water content is often important in control-ling the performance of paints, and it is critical in determiningvolatile organic compound (VOC) content when VOC contentis measured by diffe
9、rence from total volatile matter and watercontent as required in certain federal and state regulations.5. Interferences5.1 The following compounds, tested at twice the samplesize, have been found to produce no measurable response to thecalcium hydride reaction test kit and, therefore, cause nointerf
10、erence at levels up to 40 %:3EthanolMethanolAcetoneAMethyl Ethyl KetoneTetrahydrofuranDiethylene Glycol Dimethyl EtherEthylene GlycolADiethylene GlycolDipropylene GlycolStearic Acid2Ethyl Hexanoic AcidLead Oxide (II and III)Aluminum Oxide (Brockman I)A0.25 mL sample size program A and B.5.2 When usi
11、ng the 5 mL sample size programs, that is,programs C, D, or E, ethylene glycol and acids have beenfound to produce a positive result in the presence of a smallamount of water. Ethylene glycol responds at approximately7 % of the volumetric equivalent.1This test method is under the jurisdiction of AST
12、M Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved June 1, 2013. Published June 2013. Originallyapproved in 2007. Last previous edition approved i
13、n 2007 as D7358 07. DOI:10.1520/D7358-07R13.2For 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 standards Document Summary page onthe ASTM website.3HydroSCOUT Users
14、 Manual.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16. Apparatus6.1 HydroSCOUT4SystemA test kit system consisting ofthe HydroSCOUT meter, reaction tubes, sampling syringes anddilution vials.5The entire analytical sequence, includi
15、ngsampling, sample dilution, chemical reactions andquantification, is available in kit form using pre-dispensed andencapsulated reagents. An analytical balance is required inorder to obtain the most precise results. In addition, a mechani-cal shaker may be necessary to obtain a representative sample
16、.7. Reagents and Materials7.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.All reagents shall conform to the specificationsof the Committee on Analytical reagents of the AmericanChemical Society, where such specifications are available.67.2 Purity of WaterUnless otherwise indi
17、cated, referenceto water shall mean reagent water conforming to SpecificationD1193, Type II.7.3 Calcium Hydride (20 %) in HI SOL 10contained in acrushable glass ampule.7.4 Watercontained in a crushable glass ampule.7.5 Diethylene Glycol Dimethyl Ether (Diglyme)2.25 mLcontained in a glass vial.8. Haz
18、ards8.1 Store ampules in a cool, dry place. Keep away fromheat, sparks, water and open flames.8.2 See manufacturers instructions and Material SafetyData Sheet (MSDS) before use.8.3 The gray ampule in the tube contains calcium hydride,which is a flammable solid and water reactive.8.4 Perform test onl
19、y in a well ventilated area.8.5 Always wear rubber gloves and safety glasses.8.6 Take care to ensure that fingers are not cut by glass inthe kits. Each ampule should be crushed only once to reducethe risk of glass pieces piercing the sides of the tube.8.7 When venting reaction tube after completion
20、of test,point tube upright and away from user and bystander.8.8 When breaking the green water ampule after completionof test, the tube must be shaken vigorously for the full 15seconds to ensure that the water contacting the remainingcalcium hydride does not overheat the side of the tube,otherwise tu
21、be failure can result.9. Sampling, Test Specimens, and Test Units9.1 Sample CollectionTake a representative sample of theliquid coatings in accordance with Practice D3925. Mixthoroughly before taking specimens for individual tests.10. Preparation10.1 PreparationRemove a sampling syringe with capand
22、a test tube from the kit box. Check the contents to ensurethat all items are present and intact. If a dilution is to be used,remove a dilution vial and an additional sampling syringe andcap. Remove the screw cap and rubber septum from the tubeand the cap from the dilution vial, if used. Insert one g
23、reenwater ampule into the top of the polypropylene ampule sleeveand replace the holder in the tube.11. Calibration and Standardization11.1 The commercially available meter is calibrated at thefactory over the pressure range of 0 to 60 psig. Each time themeter is turned on, the pressure transducer re
24、calibrates the 0psig point. If this changes significantly from the factory setpoint, an error message will be displayed. This error will alsoappear if a tube is accidentally inserted into the meter beforethe meter is turned on.12. Procedure12.1 Sample Introduction for Expected Water Content LessThan
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