ASTM D2371-19

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: D2371 − 19
Standard Test Method for
Pigment Content of Solvent-Reducible Paints
This standard is issued under the fixed designation D2371; 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 (´) 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. Significance and Use
1.1 This test method covers the procedure for the quantita- 3.1 This test method is suitable for setting specifications for
tive separation of the vehicle from the pigment in solvent- the pigment content of solvent-reducible paints as well as for
reducible coatings. monitoring manufacturing quality control.
1.2 This test method has been proven to be applicable to the 3.2 This test method provides the isolated pigment fraction
followingtypesofpaints: white linseed oil outside housepaint, from solvent-reducible paints that may be used for pigment
white soya and phthalic alkyd enamel, white linseedo-phthalic analysis.
alkyd enamel, red lead primer, zinc chromate primer, flat white
4. Apparatus
inside enamel, white epoxy enamel, white vinyl toluene
modified alkyd, and white amino modified baking enamel. It is
4.1 Centrifuge, explosion-proof, capable of developing
considered to be applicable to most solvent-reducible paints.
1000 to 2000 g.
1.3 The values stated in SI units are to be regarded as the
NOTE1—Thecentrifugeshouldbeequippedwithasuitableheadtotake
standard. The values given in parentheses are for information
the proper size trunnion cups necessary for use of the 90-mL tubes or
only. 120-mL(4-oz) bottles.Atwo, four, or six-place head can be used with the
bottles and an eight-place head can be used with the tubes.
1.4 This standard does not purport to address all of the
4.2 Centrifuge Tube, 90-mL, heavy-walled. In place of the
safety concerns, if any, associated with its use. It is the
90-mL centrifuge tube a 120-mL (4-oz) screw cap bottle with
responsibility of the user of this standard to establish appro-
vinyl-lined screw cap may be used.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4.3 Laboratory Oven, vented and capable of maintaining a
Specific hazard statements are given in Section 6.
temperature of 105 6 2°C.
1.5 This international standard was developed in accor-
4.4 Syringe, 5-mL.
dance with internationally recognized principles on standard-
4.5 Water Bath.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5. Solvents
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5.1 Ethyl Ether or Petroleum Ether: (Warning—See 6.1).
2. Referenced Documents 5.2 Extraction Mixture—Mix 10 volumes of ethyl ether, 6
volumes of benzene or toluene, 4 volumes of methyl alcohol,
2.1 ASTM Standards:
and 1 volume of acetone (Warning—See 6.2, 6.3, and 6.4).
D2698 Test Method for Determination of the Pigment Con-
tent of Solvent-Reducible Paints by High-Speed Centri-
6. Hazards
fuging
6.1 Ethyl Ether and Petroleum Ether—Flammable. Vapor is
harmful. May be fatal if inhaled or swallowed. Use only with
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
adequate ventilation.Avoid prolonged contact with skin.Avoid
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
Current edition approved Dec. 15, 2019. Published January 2020. Originally
approved in 1965. Last previous edition approved in 2010 as D2371 – 85 (2010)
which was withdrawn July 2019 and reinstated December 2019. DOI: 10.1520/ The sole source of supply of bottles and caps, Cat. No. S9185C, 4-oz bottle,
D2371-19. known to the committee at this time is Sargent Welch Scientific, 7300 N. Linder
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Ave., Skokie, IL60076. If you are aware of alternative suppliers, please provide this
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM information to ASTM International Headquarters. Your comments will receive
Standards volume information, refer to the standard’s Document Summary page on careful consideration at a meeting of the responsible technical committee, which
the ASTM website. you may attend.
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D2371 − 19
contact with flame, hot surface, or sparks. Do not get in eyes,
n = rotating speed, r/min.
on skin, or on clothing. Refer to suppliers’ Material Safety
7.5 Discard the upper layer by decantation.
Data Sheet.
7.6 Repeat the extraction twice as de
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