ASTM D2698-05(2022)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D2698 − 05 (Reapproved 2022)
Standard Test Method for
Determination of the Pigment Content of Solvent-Reducible
Paints by High-Speed Centrifuging
This standard is issued under the fixed designation D2698; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript 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 3.2 This test method is used by paint producers and con-
sumers for product acceptance and process control.
1.1 This test method covers the separation of pigment from
solvent-reducible paints and the calculation of the percent
4. Apparatus
pigment from the results of nonvolatile determinations on the
4.1 Laboratory Centrifuge, capable of developing 32 000 g
total paint and the separated vehicle.
or higher.
NOTE 1—This test method has been proven to be applicable to most
solvent-reducible paints, the exception being those paints containing
5. Procedure
severelybleedingpigmentsorpigmentssuchascarbonblackthatarevery
difficult or impossible to centrifuge.
5.1 Shake the sample for 10 min on a mechanical shaker,
1.2 The values stated in SI units are to be regarded as stirwithapaddletoloosenanycakedpigment,andshakeagain
standard. No other units of measurement are included in this for10min.Ifnecessary,repeatuntiltherearenolumpspresent
standard. and the sample is thoroughly mixed.
1.3 This standard does not purport to address all of the
5.2 Add the mixed paint to the centrifuge container until
safety concerns, if any, associated with its use. It is the
sufficient paint is added to permit the recovery of 25 mL
responsibility of the user of this standard to establish appro-
minimum of clear vehicle. Revolve the bowl at 32 000 g or
priate safety, health, and environmental practices and deter-
higher for 15 min or until a clear vehicle is obtained.
mine the applicability of regulatory limitations prior to use.
5.3 Transfer the vehicle carefully, so as not to dislodge any
1.4 This international standard was developed in accor-
of the pigment from the walls, into a jar that is immediately
dance with internationally recognized principles on standard-
capped to prevent any solvent losses by evaporation. Use this
ization established in the Decision on Principles for the
vehicle for the determination of the nonvolatile content of the
Development of International Standards, Guides and Recom-
separated vehicle.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
6. Percent Paint and Vehicle Solids
6.1 Determine the percent nonvolatile content of the origi-
2. Referenced Documents
2 nal paint and the separated vehicle in accordance with Test
2.1 ASTM Standards:
Method D2369.
D2369Test Method for Volatile Content of Coatings
7. Calculation
3. Significance and Use
7.1 Calculate the weight percent pigment of paint, P,as
3.1 Thistestmethoddescribesarapidmethodforseparating
follows:
pigment from solvent-reducible paints.
P 5 A 2 B 3100/100 2 B (1)
~ !
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. A supercentrifuge or a centrifuge equipped with a high-speed head have been
Current edition approved Dec. 1, 2022. Published December 2022. Originally found satisfactory for this purpose.Any centrifuge capable of developing 32 000 g
approved in 1965. Last previous edition approved in 2015 as D2698–05 (2015). and having facilities for sealing the specimen to prevent solvent loss should also
DOI: 10.1520/D2698-05R22. prove to be
...