1、Designation: D1483 12D1483 12 (Reapproved 2016)Standard Test Method forOil Absorption of Pigments by Gardner-Coleman Method1This standard is issued under the fixed designation D1483; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、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 U.S. Department of Defense.1. Scope*Scope1.1 This test meth
3、od covers the determination of oil absorption of pigments by the Gardner-Coleman procedure.21.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.3 This standard does not purport to address all of the safety concerns, if any,
4、 associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:3D281 Test Method for Oil Absorption of Pigments by Spat
5、ula Rub-out3. Summary of Test Method3.1 A soft paste is formed by the dropwise addition of linseed oil to the gently stirred pigment. The amount of oil required toform the paste is used to calculate an oil absorption value.4. Significance and Use4.1 The oil absorption value obtained by this test met
6、hod provides information about the vehicle demand of the pigment whenit is used in a pigment paste. Oil absorption values can be used to characterize batches of a given pigment.4.2 This test method differs from Test Method D281 in that D281 requires a vigorous rubbing action whereas this test method
7、involves only a gentle stirring and folding of the pigment. Because the end points are different, the values obtained from the twotest methods generally differ.5. Apparatus and Materials5.1 Balance, capable of weighing to 0.01 g.5.2 Glass Container, round-bottom, having a capacity of 250 mL (12 pt),
8、 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 by 100 mm (12 or 34 by 4 in.).5.5 Linseed Oil, raw, conforming to the following specification:Specific Gravity 0.926 0.931Boiling Point 149CAcid Number 3 1Saponification Valu
9、e 185 196Iodine Value 170 minimumGardner Color 13 maximum1 This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.24 on Physical Properties of Liquid Paints as the particles of pi
10、gment becomewetted, they collect in small lumps that gradually coalesce. As the coalescence proceeds, reduce the rate of oil addition by at leasthalf. The end point is reached when the lumps, with a rolling action from the spatula, collect into a single ball or the excess ofoil smears the wall of th
11、e container.7. Calculation7.1 Calculate the oil absorption, A, as follows:A5M30.93P 3100 (1)D1483 12 (2016)2where: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
12、pigment as grams of oil per 100 grams of pigment.9. Precision and Bias9.1 On the basis of an interlaboratory study of this test method in which one operator in each of 5 laboratories tested 5 pigmentswith a broad range of oil absorption levels, the within-laboratory coefficient of variation was 3.4
13、% at 25 df and thebetween-laboratory coefficient of variation was 5.3 % at 20 df. Based on these coefficients, the following criteria should be usedto judge the acceptability of results at the 95 % confidence level:9.1.1 RepeatabilityTwo results obtained by the same operator should be considered sus
14、pect if they differ by more than 9.9 %relative.9.1.2 ReproducibilityTwo results obtained by different operators in different laboratories should be considered suspect if theydiffer by more than 15.3 % relative.9.2 BiasSince there is no accepted reference material suitable for determining bias for th
15、e procedure in this test method, biascannot be determined.10. Keywords10.1 Gardner-Coleman Method; oil absorption; pigments (general properties)SUMMARY OF CHANGESCommittee D01 has identified the location of selected changes to this standard since the last issue (D1483 - 95(2007) that may impact the
16、use of this standard. (Approved February 1, 2012.)(1) Specification D234, Specification for Raw Linseed Oil has been withdrawn. Therefore, the properties of the oil have been listedin section 5.5 in this standard.(2) References to pounds have been removed from section 8.1.ASTM International takes no
17、 position respecting 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 respons
18、ibility.This standard 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
19、 ASTM International 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 addr
20、ess 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 12 (2016)3
