ASTM_D_280_-_01_2012.pdf

Designation:D28001(Reapproved 2012)Standard Test Methods forHygroscopic Moisture(and Other Matter Volatile Under theTest Conditions)in Pigments1This standard is issued under the fixed designation D280;the number immediately following the designation indicates the year oforiginal adoption or,in the case of 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.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 These test methods cover procedures for determininghygroscopic moisture(and other matter volatile under the testconditions)in pigments.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.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.METHOD AFOR PIGMENTS THAT DO NOTDECOMPOSE AT 110C2.Apparatus2.1 Weighing Bottle,wide-mouth,cylindrical,glass(flatform,about 30 mm in height and about 70 mm in diameter),provided with a ground-in glass stopper.Or,an aluminummoisture dish(about 90 mm in diameter and about 50 mm indepth)with a tightly fitting cover.2.2 Oven in which a temperature of from 110 6 2C ismaintained.2.3 Analytical Balance.3.Procedure3.1 Weigh accurately the glass weighing bottle and stopperor the aluminum moisture dish with cover.Place a specimen offrom 3 to 5 g of the pigment in the clean,dry weighing bottleor in the clean,dry aluminum moisture dish.Insert the stopper(or cover)and weigh to 0.1 mg.Subtract the weight of thevessel from the total weight to obtain the weight of sampleused in the test.Remove the stopper(or cover)and place it andthe bottle(or dish)containing the specimen in an oven that hasbeen previously heated to 110 6 2C,heat for 2 h at atemperature of 105 to 110C.Replace the stopper(or cover),cool in a desiccator,and weigh.Calculate the total loss inweight as percent of moisture and other volatile matter.METHOD BFOR PIGMENTS THAT DECOMPOSEAT 110C4.Apparatus4.1 Weighing Bottle,glass,as described in 2.1.4.2 Open-Tube Manometer made of glass tubing 6 mm indiameter,filled with mercury to approximately 860 mm,fittedwith rubber pressure tubing attached to a T-joint leading to thedesiccator and the pump.A suitable low-pressure gage may beused in place of the manometer.NOTE1The difference in levels of the mercury in the manometerwhen the system is in operation,subtracted from the barometer readingtaken at the same time,gives the pressure of the system in millimetres ofmercury.4.3 Desiccator,glass,having a hole at the side or in thecover,constructed with heavy walls to withstand a vacuum ofone atmosphere.The hole at the side shall be closed with aone-hole rubber stopper carrying a glass tube with a rubbertube connection and a pinchcock or with a glass stopcockground to fit the tubulature.4.4 Oil Vacuum Pump,2able to achieve and hold a vacuumof 3 mm.4.5 Analytical Balance.5.Procedure5.1 Weigh accurately the glass weighing bottle and stopper.Place a specimen of from 1 to 3 g of the pigment in the clean,dry weighing bottle,insert the stopper and weigh to 0.1 mg.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 Nov.1,2012.Published November 2012.Originallyapproved in 1928.Last previous edition approved in 2007 as D280 01(2007).DOI:10.1520/D0280-01R12.2The sole source of supply of the“Hyvac”oil pump known to the committee atthis time is HyVac Products,Inc.,P.O.Box 389,Phoenixville,PA 194600389.Ifyou are aware of alternative suppliers,please provide this information to ASTMInternational Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Subtract the weight of the vessel from the total weight to obtainthe weight of sample used in the test.5.2 Remove the stopper and place it and the bottle contain-ing the specimen in the desiccator containing fresh,anhydrousmagnesium perchlorate.3Close the desiccator,attach to thepump,and gradually evacuate until the pressure is constant at3 mm or less(Note 2).Close the pinchcock or stopcock,stopthe pump,and let stand at room temperature(21 to 32C)for24 h.5.3 Slowly admit air that has been dried by passage throughfresh magnesium perchlorate to the desiccator by means of thepinchcock or stopcock,remove the cover,quickly replace thestopper in the weighing bottle,and weigh.Repeat the evacu-ations and weighings until the loss in wei