1、Designation: D280 01 (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, i
2、n 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 T
3、hese 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 ad
4、dress 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. App
5、aratus2.1 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
6、 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 to5gofthepigment in the clean, dry weighing bottleor in the clean, dry aluminum moisture dish. Insert the st
7、opper(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 for2hatat
8、emperature 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
9、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.NOTE 1The difference in levels of the mercury in the man
10、ometerwhen 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
11、 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
12、 glass weighing bottle and stopper.Place a specimen of from 1 to3gofthepigment 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 directres
13、ponsibility 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 c
14、ommittee 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,1wh
15、ich you may attend.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Subtract 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 t
16、he 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
17、.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 weight does not exce
18、ed0.5 mg in 24 h. Calculate the total loss in weight as percent ofmoisture and other volatile matter (Note 3).NOTE 2Caution should be used in evacuating glass desiccators. Thevacuum should be applied gradually. Desiccators will maintain a vacuumfor a greater length of time when a thin film of a suit
19、able stopcocklubricant is applied to the ground surfaces. Desiccators when evacuatedshould be wrapped in towels or covered by other means to preventpossible injury to the operator.NOTE 3This is an empirical method and the details should be strictlyfollowed. The determination of the true hygroscopic
20、moisture content ofvery finely divided pigments is very difficult, if not impossible in somecases.6. Keywords6.1 moisture; pigment; volatileASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this
21、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 standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years
22、 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 International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committe
23、e, 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.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-
24、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), 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/).3Available from Chemical Suppliers under the name Anhydrous or Dehydrite.D280 01 (2012)2
