ASTM D2067-97

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 2067 – 97
Standard Test Method for
Coarse Particles in Printing Ink Dispersions
This standard is issued under the fixed designation D 2067; 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 mineral spirits or other mutually agreeable solvent, mixed in a
paint shaker for 30 min, and passed through a tared 325-mesh
1.1 This test method covers the determination of the weight
wire cloth sieve. The sieve is dried in an oven and reweighed.
concentration of coarse particles in printing ink dispersions by
The residue is reported either as a percentage or in parts per
sieve retention.
million of the specimen.
1.2 This test method is applicable to printing inks, flushed
3.2 The nature of the coarse particles may be identified
pigments, and other pigment dispersions that contain particles
through the use of a magnet and visual or microscopic
larger than 45 μm. With proper choice of solvent, it is
examination.
applicable both to paste and liquid inks.
NOTE 1—This test method is similar in principle to Test Method D 185. 4. Significance and Use
For particles under 25 μm, see Test Method D 1316.
4.1 Coarse particles in printing inks reduce the efficiency of
1.3 This standard does not purport to address the safety
the dispersion process, requiring not only extra milling passes,
concerns, if any, associated with its use. It is the responsibility
but also frequent changes in pump filters. In printing processes,
of the user of this standard to establish appropriate safety and
they may cause excessive wear to metal plates, piling or
health practices and determine the applicability of regulatory
localized retention of ink on blankets and plates, and water
limitations prior to use.
balance problems. Coarse particles also reduce color strength
and the gloss of printed matter.
2. Referenced Documents
4.2 This test method is suitable for quality control. The
2.1 ASTM Standards:
precision may be improved by the use of a specimen size larger
D 185 Test Methods for Coarse Particles in Pigments,
than that prescribed.
Pastes and Paints
4.3 Test results are sensitive to the type of washout solvent
D 235 Specification for Mineral Spirits (Petroleum Spirits)
used. Strong solvents are to be avoided because they may
(Hydrocarbon Dry Cleaning Solvent)
dissolve large particles of resin in the ink vehicle.
D 1316 Test Method for Fineness of Grind of Printing Inks
5. Apparatus
by the NPIRI Grindometer
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
5.1 Wire-Cloth Sieve, preferably disposable, 325 mesh (45
poses
μm), 60.3 mm in diameter; alternatively, a 75-mm No. 325
E 145 Test Method for Gravity-Convection and Forced-
sieve conforming to Specification E 11.
Ventilation Ovens
NOTE 2—A disposable sieve is preferred for precision because it weighs
E 691 Practice for Conducting an Interlaboratory Study to
only 0.5 g compared to about 70 g for a conventional sieve.
Determine the Precision of a Test Method
5.2 Washout Cup Assembly (for use with the disposable
3. Summary of Test Method sieve), assembled according to the manufacturer’s instructions.
5.3 Balance, sensitive to 1.0 mg, preferably 0.1 mg.
3.1 A 50-g specimen of the test dispersion is diluted, if
5.4 Paint Shaker.
necessary, with a reducing varnish, mixed with 200 g of
5.5 Oven, gravity-convection type conforming to Type 1B
in Test Method E 145 and maintained at 110° 6 5°C.
This test method is under the jurisdiction of ASTM Committee D-1 on Paint,
5.6 Mixing Container, such as a widemouth bottle or jar,
Related Coatings, Materials, and Applications and is the direct responsibility of
with screw cap, capacity 1 pt (473 mL), preferably plastic. If a
Subcommittee D01.56 on Printing Inks.
glass jar is used, a metal container such as a 1-lb coffee can
Current edition approved Dec. 10, 1997. Published August 1998. Originally
with lid and foam packing are recommended for protecting the
published as D 2067–92. Last previous edition D 2067–92.
Annual Book of ASTM Standards, Vol 06.03.
jar while on the shaker.
Annual Book of ASTM Standards, Vol 06.04.
5.7 Spatula, suitable for mixing 100 g of material.
Annual Book of ASTM Standards, Vol 06.02.
Annual Book of ASTM Standards, Vol 14.02.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D2067–97
6. Reagents and Materials until no color remains in the jar. Make sure that no residue
remains in the jar and that all solvent from the jar passes over
6.1 Washout Solvent, as mutually agreed upon between the
the screen.
producer and the user. Type I mineral spirits conforming to
8.8 Wash down the sides of the washout cup assembly (if
Specification D 235 has been found useful for oleoresinous
used) and the sides of the screen, collecting the residue close to
systems. The solvent should be filtered through a 325-mesh
the center of the sieve.
screen prior to use.
8.9 Place the sieve in a convection oven at 110°C for a few
6.2 Reducing Varnish, for high-viscosity or stiff dispersions.
min or until the screen and residue are dry. Cool in a desiccator
The varnish must be compatible with the test dispersion and of
and weigh. Record the weight of the residue.
a consistency such that a 50:50 mix will have sufficient flow to
8.10 Repeat 8.1 or 8.2 to 8.9 with a second specimen.
disperse in the washout solvent. An 800–1200 poise-reducing
8.11 If a reducing varnish was used (in 8.2) and it was not
varnish has been found useful for flushed pigments. The
washed and sieved, run a blank on two replicate specimens.
reducing varnish should be washed or filtered, or both prior to
8.12 Valuable information may be obtained on the nature of
use; otherwise, a blank must be run (see 8.11).
the coarse particles by vis
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