1、Designation:D120896(Reapproved 2012)Standard Test Methods forCommon Properties of Certain Pigments1This standard is issued under the fixed designation D1208;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.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 These test methods cover procedures for determiningcertain
3、 properties of pigments.The procedures appear in thefollowing order:Dry PigmentsSectionsLoss on Ignition and Ash4Matter Soluble in Water5Hydrogen Ion Concentration(pHValue)6Alkalinity or Acidity by Titration7 and 8Water Content(Distillation Method)9 and 10Pigment Pastes in OilWater Content(Distillat
4、ion Method)9 and 10Pigment Content of Paste in Oil11Total Volatile Matter in Paste in Oil121.2 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,associa
5、ted with its use.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:2D95 Test Method for Water in Petroleum Products andBituminous
6、Materials by DistillationD280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD1135 Test Methods for Chemical Analysis of Blue Pig-mentsE70 Test Method for pH of Aqueous Solutions With theGlass Electrode3.Significance and Use3.1 This collection of
7、test methods is used by pigmentproducers and paint manufacturers for process control,forproduct acceptance,and for research and development.LOSS ON IGNITION AND ASH4.Procedure4.1 Dry about 5 g of the sample at 105 6 2C for 2 h.Transfer about 1 g of the dried pigment,weighed to 0.1 mg,toa previously
8、ignited,weighed porcelain crucible,and ignite at900 to 1000C for 20 min.Cool in a desiccator and weigh.Heatagain for 10 min at 900 to 1000C to check the loss in weight.4.2 CalculationCalculate the percent of loss on ignition,L,and of ash,A,as follows:L 5LwS13100(1)SA 5WaS13100Dwhere:Lw=loss in weigh
9、t on ignition,g,A=ash,%,Wa=weight of ash,g,andS1=specimen weight,g.MATTER SOLUBLE IN WATER5.Procedure(Note 1)5.1 Weigh about 10 g of the sample to 1 mg,and place in a400-mL beaker.Add 100 mL of water(Note 2),boil for 5 mincool,and transfer quantitatively to a 250-mL volumetric flask.Dilute with wate
10、r to 250 mL,mix,and allow to settle.Filter thesupernatant liquid through a dry paper(Note 3)and discard thefirst 25 mL.Evaporate 100 mL of the clear filtrate to drynessin a weighed flatbottom dish,preferably in an oven at 105 62C.Cool and weigh.NOTE1This test method is not suitable for use with iron
11、 bluepigment.Use the conductivity method given in Test Methods D1135.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.31 on Pigment Specifications.Current edition approved
12、 Nov.1,2012.Published November 2012.Originallyapproved in 1952.Last previous edition approved in 2007 as D1208 96(2007).DOI:10.1520/D1208-96R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volum
13、e information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE2If the pigment is found to be strongly water-repellent,wet thesample with a small amount of alcohol or carr
14、y out a preliminary washingwith chloroform.NOTE3Water-dispersible pigments must be filtered with a suitablefilter pad or the method may not be applicable.5.2 CalculationCalculate the percent of matter soluble inwater,M,as follows:M 5R132.5S23100(2)where:R1=residue weight,g,andS2=specimen weight,g.HY
15、DROGEN ION CONCENTRATION(pH VALUE)6.Procedure6.1 Determine hydrogen ion concentration in accordancewith either of the following methods:6.1.1 Electrometric Method(Preferred Procedure)Weighabout 5 g of the sample to 10 mg,place in a 150-mL beaker,and add 50 g of warm distilled water,freshly boiled to
16、 removecarbon dioxide.Mix well by means of a glass rod and cool to25C.Measure the pH of the mixture in accordance with TestMethod E70.6.1.2 Colorimetric MethodWeigh about 10 g of thesample to the nearest 10 mg,place in a 250-mLglass-stopperedErlenmeyer flask,and add 150 g of warm distilled water,freshly boiled to remove carbon dioxide.Stopper the flask andshake vigorously for about 1 min.Cool to 25C.Let stand 1 hto allow the pigment to settle.Decant the clear liquid anddetermine its pH at once b