1、Designation: D1483 12Standard 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, the year of last revision.
2、 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. Scope*1.1 This test method covers the determination of oil a
3、bsorp-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 its use. It is theres
4、ponsibility 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:3D281 Test Method for Oil Absorption of Pigments bySpatula Rub-out3. Summary of Test Method
5、3.1 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 obtained by this test methodprovides information about the vehi
6、cle 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 D281 in thatD281 requires a vigorous rubbing action whereas this testmethod involves only a gentle stirring and foldi
7、ng 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 capacity of250 mL (12 pt), or a low-form 250-mL beaker.5.3 Buret, gra
8、duated 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 the following specifi-cation:Specific Gravity 0.926 0.931Boiling Point 149CAcid Number 3 6 1Saponification Value 185 196Iodine Value 170 minimumGardner C
9、olor 13 maximum6. Procedure6.1 The weight 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 =
10、20.2 g).Transfer the amount, weighed 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 p
11、articles of pigmentbecome wetted, they 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 th
12、e wall of the container.7. Calculation7.1 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 Pr
13、operties of Liquid Paints 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 use of this standard. (Approved February 1, 2012.)(1) Specification D234,
14、Specification for Raw Linseed Oil hasbeen withdrawn. Therefore, the properties of the oil have beenlisted in section 5.5 in this standard.(2) References to pounds have been removed from section 8.1.ASTM International takes no position respecting the validity of any patent rights asserted in connecti
15、on 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 standard is subject to revision at any time by the responsible
16、 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 International Headquarters. Your comments will receive careful consi
17、deration 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.This standard is copyrighted by ASTM International, 100 Ba
18、rr 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/).D1483 122
