ASTM D332-87(2004)
(Test Method)Standard Test Method for Relative Tinting Strength of White Pigments by Visual Observation
Standard Test Method for Relative Tinting Strength of White Pigments by Visual Observation
SIGNIFICANCE AND USE
This test method is used as a referee method and for quality control. The vehicle (oil) for preparing the dispersions and the tinting pigment (ultramarine blue) are specified but other vehicles and tinting pigments can be used. Any such changes in the test method must be agreed upon between the purchaser and the seller.
The results obtained with a muller do not necessarily agree with an industrial situation where different dispersing conditions exist. However, dispersing with a muller is a fast and relatively inexpensive way of testing tinting strength for routine quality control.
SCOPE
1.1 This test method describes the procedure for determining the relative tinting strength of white pigments by visual assessment of blue tints.
1.2 This test method is applicable only for comparing the test pigment with a reference standard of the same type and grade. Test Method D 2745 describes a procedure for instrumental evaluation of black tinted samples.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 This 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D332–87(Reapproved2004)
Standard Test Method for
Relative Tinting Strength of White Pigments by Visual
Observation
This standard is issued under the fixed designation D332; 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 Department of Defense.
1. Scope numerical rating of tinting strength, dispersions with the
standard white pigment and more or less of the tinting pigment
1.1 This test method describes the procedure for determin-
are made until the lightness of the test pigment paste is
ing the relative tinting strength of white pigments by visual
matched.The weight of the tinting pigment is used to calculate
assessment of blue tints.
relative tinting strength.
1.2 This test method is applicable only for comparing the
test pigment with a reference standard of the same type and
4. Significance and Use
grade.
4.1 This test method is used as a referee method and for
NOTE 1—Test Method D2745 describes a procedure for instrumental
quality control. The vehicle (oil) for preparing the dispersions
evaluation of black tinted samples.
and the tinting pigment (ultramarine blue) are specified but
1.3 The values stated in SI units are to be regarded as the
other vehicles and tinting pigments can be used. Any such
standard. The values given in parentheses are for information
changes in the test method must be agreed upon between the
only.
purchaser and the seller.
1.4 This standard does not purport to address all of the
4.2 The results obtained with a muller do not necessarily
safety concerns, if any, associated with its use. It is the
agree with an industrial situation where different dispersing
responsibility of the user of this standard to establish appro-
conditions exist. However, dispersing with a muller is a fast
priate safety and health practices and determine the applica-
and relatively inexpensive way of testing tinting strength for
bility of regulatory limitations prior to use.
routine quality control.
2. Referenced Documents
5. Apparatus
2.1 ASTM Standards:
5.1 Balance, laboratory-type, sensitive to 0.1 mg, equipped
D262 Specification for Ultramarine Blue Pigment
with a counter-balanced watch glass.
D2745 Test Method for Relative Tinting Strength of White
5.2 Buret, 1-mL capacity, stopcock controlled, graduated in
Pigments by Reflectance Measurements
0.1-mLdivisions, or other suitable dispensing apparatus with a
delivery accurate to 0.05 mL.
3. Summary of Test Method
5.3 GlassHandMuller—Aweightedglasshandmullerwith
3.1 Specified amounts of white pigment and blue tinting
beveled edge having a total weight of 6.8 kg (15 lb) and a
pigment are dispersed together in oil using a glass hand muller
grinding face of from 70 to 75 mm (2 ⁄4 to 3 in.) in diameter.
or an automatic muller. Both the test and standard pigments are
Thefaceshallbefreeofblowholesandotherimperfectionsand
treated identically. The pastes are drawn-down together on a
keptroughenedbylightlygrindingwithNo.303opticalemery,
panel and visually assessed for tinting strength. To obtain a
or its equivalent, and turpentine.
5.4 Rubbing Surface—Aground glass plate, at least 355 by
510 mm (14 by 20 in.), the surface of which is kept roughened
This test method is under the jurisdiction of ASTM Committee D01 on Paint
by lightly grinding with No. 303 optical emery, or its equiva-
and Related Coatings, Materials, andApplications and is the direct responsibility of
lent, and turpentine.
Subcommittee D01.26 on Optical Properties.
5.5 Automatic Muller, automatic, equipped with a weight
Current edition approved Nov. 1, 2004. Published November 2004. Originally
´1
approved in 1931. Last previous edition approved in 1997 as D332 – 87 (1997) .
that exerts a permanent 50-lbf (220-N) force and an additional
DOI: 10.1520/D0332-87R04.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM The sole source of supply of the muller known to the committee at this time is
Standards volume information, refer to the standard’s Document Summary page on Hoover Color Corp., P. O. Box 218, Hiwassee, VA 24347. If you are aware of
the ASTM website. alternative suppliers, please provide this information to ASTM International
Withdrawn. The last approved version of this historical standard is referenced Headquarters.Your comments will receive careful consideration at a meeting of the
on www.astm.org. responsible technical committee, which you may attend.
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D332–87 (2004)
weightexertinga50-lbfmakingatotalof100-lbf(445-N).The 7.3 Spread the paste of the standard and test pigments in
two glass plates shall be kept sharp by removing from the parallel contiguous rectangular areas on the panel, each about
machine and grinding them face-to-face with No. 303 optical 25 mm (1 in.) wide and 50 mm (2 in.) long. Use the scraper to
emery or equivalent, and water. smooththesurfaceofthepastes(herecalled“draw-downs”)by
5.6 Spatula—A flexible spatula having a chromium-plated drawing the scraper lightly over the pastes to give a straight
or plastic blade 75 to 150 mm (3 to 6 in.) long. and even line of contact between them. Keep the drawn-downs
5.7 Panels of bright tin, glass, or white-lacquered card- sufficiently thick to obscure the panel.
board. 7.4 Immediatelyexaminethedraw-downsofthetwopastes,
5.8 Scraper—A Fren
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