1、Designation: D 1483 95 (Reapproved 2007)Standard Test Method forOil Absorption of Pigments by Gardner-Coleman Method1This standard is issued under the fixed designation D 1483; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the ye
2、ar of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 This test method covers the de
3、termination of oil absorp-tion of pigments by the Gardner-Coleman procedure.21.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with i
4、ts 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:3D 234 Specification for Raw Linseed Oil4D 281 Test Method for Oil Abso
5、rption of Pigments bySpatula Rub-out3. Summary of Test Method3.1 A soft paste is formed by the dropwise addition oflinseed oil to the gently stirred pigment. The amount of oilrequired to form the paste is used to calculate an oil absorptionvalue.4. Significance and Use4.1 The oil absorption value ob
6、tained by this test methodprovides information about the vehicle demand of the pigmentwhen it is used in a pigment paste. Oil absorption values can beused to characterize batches of a given pigment.4.2 This test method differs from Test Method D 281 in thatD 281 requires a vigorous rubbing action wh
7、ereas this testmethod involves only a gentle stirring and folding of thepigment. Because the end points are different, the valuesobtained from the two test methods generally differ.5. Apparatus and Materials5.1 Balance, capable of weighing to 0.01 g.5.2 Glass Container, round-bottom, having a capaci
8、ty of250 mL (12 pt), or a low-form 250-mL beaker.5.3 Buret, graduated in 0.1-mL divisions.5.4 Spatula, sharp-edged steel, having a blade 15 or 20 by100 mm (12 or34 by 4 in.).5.5 Linseed Oil, Raw, conforming to Specification D 234except that it shall have an acid number of 3 6 1.6. Procedure6.1 The w
9、eight of pigment used should correspond to apigment volume of 3.0 6 0.6 mL. Determine the weightneeded by multiplying 3.0 6 0.6 mL by the specific gravity ofthe pigment being tested. For example, a 20 g specimennormally is used for zinc oxide (3.6 mL 3 5.6 g/mL = 20.2 g).Transfer the amount, weighed
10、 to 0.01 g, to the glass container.6.2 Add oil from the buret at the rate of about 1 drop persecond, stirring and “folding” the pigment continuously withthe spatula during the addition. Try to provide dry pigment forthe oil to strike. Do not rub or grind; as the particles of pigmentbecome wetted, th
11、ey collect in small lumps that graduallycoalesce. As the coalescence proceeds, reduce the rate of oiladdition by at least half. The end point is reached when thelumps, with a rolling action from the spatula, collect into asingle ball or the excess of oil smears the wall of the container.7. Calculati
12、on7.1 Calculate the oil absorption, A, as follows:A 5M 3 0.93P3 100 (1)1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.24 on Physical Properties of Liquid Paints and Paint
13、Materials.Current edition approved July 1, 2007. Published July 2007. Originally approvedin 1957. Last previous edition approved in 2002 as D 1483 95 (2002).2See Gardner, H. A. and Coleman, R. E., “Oil Absorption of Pigments,”Scientific Section Circular 85, Paint Manufacturers Assoc. of the United S
14、tates,February 1920.3For 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.4Withdrawn.1Copyright ASTM International,
15、 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.where:M = oil, mL, andP = pigment, g.0.93 represents density of oil (in grams per millilitre).Express as grams of oil per 100 g of pigment.8. Report8.1 Report the oil absorption of the pigment as grams(pounds) of oi
16、l per 100 grams (pounds) of pigment.9. Precision and Bias9.1 On the basis of an interlaboratory study of this testmethod in which one operator in each of 5 laboratories tested5 pigments with a broad range of oil absorption levels, thewithin-laboratory coefficient of variation was 3.4 % at 25 dfand t
17、he between-laboratory coefficient of variation was 5.3 %at 20 df. Based on these coefficients, the following criteriashould be used to judge the acceptability of results at the 95 %confidence level:9.1.1 RepeatabilityTwo results obtained by the sameoperator should be considered suspect if they diffe
18、r by morethan 9.9 % relative.9.1.2 ReproducibilityTwo results obtained by differentoperators in different laboratories should be considered suspectif they differ by more than 15.3 % relative.9.2 BiasSince there is no accepted reference materialsuitable for determining bias for the procedure in this
19、testmethod, bias cannot be determined.10. Keywords10.1 Gardner-Coleman Method; oil absorption; pigments(general properties)ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expr
20、essly 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 andif not revise
21、d, 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 committee, which you may
22、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 19428-2959,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).D 1483 95 (2007)2
