ASTM Method D-1483 Oil Absorbtion

Standard Test Method for

Oil Absorption of Pigments by Gardner-Coleman Method 1

This standard is issued under the fixed designation D 1483;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon (e )indicates an editorial change since the last revision or reapproval.

1.Scope

1.1This test method covers the determination of oil absorp-tion of pigments by the Gardner-Coleman procedure.2

1.2The values stated in SI units are to be regarded as the standard.The values given in parentheses are for information only.

1.3This standard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility 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 Documents 2.1ASTM Standards:

D 234Specification for Raw Linseed Oil 3

D 281Test Method for Oil Absorption of Pigments by Spatula Rub-Out 43.Summary of Test Method

3.1A soft paste is formed by the dropwise addition of linseed oil to the gently stirred pigment.The amount of oil required to form the paste is used to calculate an oil absorption value.

4.Significance and Use

4.1The oil absorption value obtained by this test method provides information about the vehicle demand of the pigment when it is used in a pigment paste.Oil absorption values can be used to characterize batches of a given pigment.

4.2This test method differs from Test Method D 281in that D 281requires a vigorous rubbing action whereas this test method involves only a gentle stirring and folding of the pigment.Because the end points are different,the values obtained from the two test methods generally differ.

5.Apparatus and Materials

5.1Balance ,capable of weighing to 0.01g.

5.2Glass Container ,round-bottom,having a capacity of 250mL (1⁄2pt),or a low-form 250-mL beaker.5.3Buret ,graduated in 0.1-mL divisions.

5.4Spatula ,sharp-edged steel,having a blade 15or 20by 100mm (1⁄2or 3⁄4by 4in.).

5.5Linseed Oil ,Raw,conforming to Specification D 234except that it shall have an acid number of 361.

6.Procedure

6.1The weight of pigment used should correspond to a pigment volume of 3.060.6mL.Determine the weight needed by multiplying 3.060.6mL by the specific gravity of the pigment being tested.For example,a 20g specimen normally is used for zinc oxide (3.6mL 35.6g/mL =20.2g).Transfer the amount,weighed to 0.01g,to the glass container.6.2Add oil from the buret at the rate of about 1drop per second,stirring and “folding”the pigment continuously with the spatula during the addition.Try to provide dry pigment for the oil to strike.Do not rub or grind;as the particles of pigment become wetted,they collect in small lumps that gradually coalesce.As the coalescence proceeds,reduce the rate of oil addition by at least half.The end point is reached when the lumps,with a rolling action from the spatula,collect into a single ball or the excess of oil smears the wall of the container.

7.Calculation

7.1Calculate the oil absorption,A ,as follows:

A 5

M 30.93

P

3100(1)

where:

M =oil,mL,and P =pigment,g.

0.93represents density of oil (in grams per millilitre).Express as grams of oil per 100g of pigment.

8.Report

8.1Report the oil absorption of the pigment as grams (pounds)of oil per 100grams (pounds)of pigment.9.Precision and Bias

9.1On the basis of an interlaboratory study of this test

1

This test method is under the jurisdiction of ASTM Committee D01on Paint

and Related Coatings,Materials,and Applications and is the direct responsibility of Subcommittee D01.24on Physical Properties of Liquid Paints and Paint Materials.Current edition approved Feb.15,1995.Published April 1995.Originally published as D 1483–57T.Last previous edition D 1483–84(19)e 1.2

See Gardner,H.A.and Coleman,R. E.,“Oil Absorption of Pigments,”Scientific Section Circular 85,Paint Manufacturers’Assoc.of the United States,February 1920.3

Annual Book of ASTM Standards ,V ol 06.03.4

Annual Book of ASTM Standards ,V ol 06.01.

1

Copyright ©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.

Copyright by ASTM Int'l (all rights reserved);

Reproduction authorized per License Agreement with Madeline Douglass (Valspar Corp); Fri Oct 15 13:38:02 EDT 2004

9.1.1Repeatability—Two results obtained by the same operator should be considered suspect if they differ by more than9.9%relative.

9.1.2Reproducibility—Two results obtained by different operators in different laboratories should be considered suspect if they differ by more than15.3%relative.

9.2Bias—Since there is no accepted reference material suitable for determining bias for the procedure in this test method,bias cannot be determined.

10.Keywords

10.1Gardner-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 mentioned in this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the risk of 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 everyfive years and if not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of the responsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards,at the address shown below.

This standard is copyrighted by ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959, United States.Individual reprints(single or multiple copies)of this standard may be obtained by contacting ASTM at the above address or at610-832-9585(phone),610-832-9555(fax),or service@astm.org(e-mail);or through the ASTM website

(www.astm.org).