ASTM D2698-90(1999)

Standard Test Method for Determination of the Pigment Content of Solvent-Reducible Paints by High-Speed Centrifuging

SCOPE
1.1 This test method covers the separation of pigment from solvent-type paints and the calculation of the percent pigment from the results of nonvolatile determinations on the total paint and the separated vehicle.  Note 1-This test method has been proven to be applicable to most solvent-type paints, the exception being those paints containing severely bleeding pigments or pigments such as carbon black that are very difficult or impossible to centrifuge.
1.2 This standard does not purport to address the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.>

General Information

• Status: Historical
• Publication Date: 09-May-1999
• ICS: 87.060.10 - Pigments and extenders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.21 - Chemical Analysis of Paints and Paint Materials

Relations

• Replaced By: ASTM D2698-05 - Standard Test Method for Determination of the Pigment Content of Solvent-Reducible Paints by High-Speed Centrifuging
• Effective Date: 01-Jan-2005
• Referred By: ASTM D3720-90(2019) - Standard Test Method for Ratio of Anatase to Rutile in Titanium Dioxide Pigments by X-Ray Diffraction
• Effective Date: 10-May-1999
• Referred By: ASTM D2371-19 - Standard Test Method for Pigment Content of Solvent-Reducible Paints
• Effective Date: 10-May-1999
• Referred By: ASTM D2372-85(2022) - Standard Practice for Separation of Vehicle From Solvent-Reducible Paints
• Effective Date: 10-May-1999
• Referred By: ASTM F940-99(2019)e1 - Standard Practice for Quality Control Receipt Inspection Procedures for Protective Coatings (Paint), Used in Marine Construction and Shipbuilding
• Effective Date: 10-May-1999
• Referred By: ASTM D2205-20 - Standard Guide for Selection of Tests for Traffic Paints
• Effective Date: 10-May-1999

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D2698–90(Reapproved 1999)
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 (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. Scope 5. Procedure
1.1 This test method covers the separation of pigment from 5.1 Shake the sample for 10 min on a mechanical shaker,
solvent-reducible paints and the calculation of the percent stirwithapaddletoloosenanycakedpigment,andshakeagain
pigment from the results of nonvolatile determinations on the for10min.Ifnecessary,repeatuntiltherearenolumpspresent
total paint and the separated vehicle. and the sample is thoroughly mixed.
5.2 Add the mixed paint to the centrifuge container until
NOTE 1—This test method has been proven to be applicable to most
sufficient paint is added to permit the recovery of 25 mL
solvent-reducible paints, the exception being those paints containing
minimum of clear vehicle. Revolve the bowl at 32 000 g or
severelybleedingpigmentsorpigmentssuchascarbonblackthatarevery
difficult or impossible to centrifuge. higher for 15 min or until a clear vehicle is obtained.
5.3 Transfer the vehicle carefully, so as not to dislodge any
1.2 This standard does not purport to address all of the
of the pigment from the walls, into a jar that is immediately
safety concerns, if any, associated with its use. It is the
capped to prevent any solvent losses by evaporation. Use this
responsibility of the user of this standard to establish appro-
vehicle for the determination of the nonvolatile content of the
priate safety and health practices and determine the applica-
separated vehicle.
bility of regulatory limitations prior to use.
6. Percent Paint and Vehicle Solids
2. Referenced Documents
6.1 Determine the percent nonvolatile content of the origi-
2.1 ASTM Standards:
2 nal paint and the separated vehicle in accordance with Test
D2369 Test Method for Volatile Content of Coatings
Method D2369.
3. Significance and Use
7. Calculation
3.1 Thistestmethoddescribesarapidmethodforseparating
7.1 Calculate the weight percent pigment of paint, P,as
pigment from solvent-reducible paints.
follows:
3.2 This test method is used by paint producers and con-
P 5 ~A 2 B! 3100/100 2 B (1)
sumers for product acceptance and process control.
where:
4. Apparatus
A 5 nonvolatile content of paint,%, and
4.1 Laboratory Centrifuge, capable of developing 32 000 g
B 5 nonvolatile content of separated vehicle,%.
or higher.
8. Recovery of Pigment for Analysis
8.1 The pigment may be completely recovered from the
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of centrifuge bowl and washed to remove residual vehicle. This
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
may be done either by a Soxhlet extraction or washing the
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