1、Designation: D716 86 (Reapproved 2012)Standard Test Methods forEvaluating Mica Pigment1This standard is issued under the fixed designation D716; 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
2、 parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 These test methods cover the evaluation of mica pig-ment.1.2 The values stated in SI units are to be regarded as thestandard. The values given i
3、n parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations pri
4、or to use.2. Referenced Documents2.1 ASTM Standards:2D185 Test Methods for Coarse Particles in PigmentsD280 Test Methods for Hygroscopic Moisture (and OtherMatter Volatile Under the Test Conditions) in PigmentsE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3. Significance and Use3.1
5、 These test methods are used to determine apparentdensity of mica pigments and the grit level. This information issignificant to the user of mica pigments for inclusion incoatings.APPARENT DENSITY4. Apparatus4.1 VolumeterA Scott volumeter or similar apparatusmodified as follows: The screen used shal
6、l conform to therequirements of a No. 40 (425-m) sieve as prescribed inSpecification E11. The funnel below the screen shall bereplaced by a conical funnel having a bottom opening 25 mm(1 in.) in diameter. It may be found necessary to replace the topglass baffle with one that is longer to ensure that
7、 all of the siftedmica is caught.5. Procedure5.1 Transfer convenient quantities of the mica pigment tothe funnel of the modified volumeter and brush the pigmentthrough the screen with a camel-hair brush until the receiver isslightly more than full. Scrape off the excess and weigh thepigment. Care mu
8、st be taken not to jar the apparatus during theprocedure.6. Calculation6.1 Calculate the apparent density of the mica pigment andconvert to pounds per cubic foot.7. Report7.1 Report the mean of three determinations as the apparentdensity of the mica pigment.8. Reproducibility of Results8.1 The mean
9、of the three determinations should checkwithin 5 %.MOISTURE AND OTHER VOLATILE MATTER9. Procedure9.1 Determine the moisture and other volatile matter inaccordance with Test Methods D280.GRIT10. Apparatus10.1 Beaker, 600-mL, low-form.10.2 Metal TubingAn L-shape metal tube (Fig. 1) 6.4 mm(14 in.) in o
10、utside diameter with a foot 25 mm (1 in.) in length.The foot of the tube shall be drilled to 4.4 mm (0173 in.) (No.17 drill) in inside diameter for a depth of 12.7 mm (12 in.). Thetube shall be placed in the beaker with the long arm in thevertical position, and the foot of the L parallel to the bott
11、om ofthe beaker and perpendicular to the radius of the bottom at apoint such that there is about 1.5-mm (116-in.) clearancebetween the tubing and both the bottom and side of the beaker.The center of the foot shall be placed 90 from the lip of thebeaker.1These test methods are under the jurisdiction
12、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 1943. Last previous edition approved in 2007 as D716
13、 86 (2007).DOI: 10.1520/D0716-86R12.2For 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.Copyright ASTM Internatio
14、nal, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States111. Procedure11.1 Transfer 10 g of the sample to the 600-mL beaker, add100 mL of water, and swirl the beaker until the mica isdispersed. Insert the metal tubing into the beaker as describedin 10.2 and connect th
15、e upper end to a water faucet. Regulatethe flow of water by a constant head to a rate of 800 mL/minover the lip of the beaker. When the elutriation has progressedso that the body of the water in the beaker is clear, stop theflow, and lower the water level to prevent spilling.11.2 Swirl the beaker ag
16、ain to bring the remaining micapigment into suspension and repeat the elutriation procedure asdescribed in 11.1 three times. After final clearing, decant partof the water, and filter the residue. Transfer the paper andresidue to a weighed crucible, and ash slowly, cool, and weigh.12. Calculation12.1
17、 Calculate the percent grit, G, as follows:G,%5 A 2 B!/S# 3100 (1)where:A = ash, g,B = filter paper ash, g, andS = sample used, g.COARSE PARTICLES13. Procedure13.1 Determine the course particles in accordance with TestMethods D185.COLOR14. Standard Pigments14.1 Standard Mica Pigment.14.2 Standard Zi
18、nc Oxide.15. Procedure15.1 Compare pastes made by rubbing a standard micapigment and standard zinc oxide, mutually agreed upon by thepurchaser and the seller, in linseed oil with a similar pasteusing the sample to be tested. Rub9gofzinc oxide, and 3 gof mica pigment on a glass plate with a glass mul
19、ler or rubberspatula to avoid staining, with 4 mL of bleached linseed oil.Spread the pastes adjacently on a clear glass plate anddetermine the color by viewing the spreadouts on the glass.16. Precision and Bias16.1 Insufficient data are available to develop acceptableprecision and bias statements. T
20、he information presented inSection 8 (Reproducibility of Results) was obtained in 1943,and no documentation is currently available. The informationwill remain in Section 8.17. Keywords17.1 analysis of; detection in mica pigment; grit; micapigment; pigmentASTM International takes no position respecti
21、ng the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this 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 stand
22、ard is subject to revision at any time by the responsible technical committee and must be reviewed every five years 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 Internation
23、al Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, 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.T
24、his 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 610-832-9585 (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/).FIG. 1 Grit Test ApparatusD716 86 (2012)2
