Measurement of Average Particle Size of Fine Pigments

Abstract

f ^HE reénforcing proper-I ties of pigments used in rubber compounding and the milling characteristics of these pigments are so intimately connected with their degree of fineness that considerable interest is attached to securing measurements of their average par-157

Practical Evaluation of Commercial Rubber Carbon Blacks by X-Ray Diffraction

“…I, assuming right hexagonal prisms. 6 From methylene blue adsorption and Paneth's data for area covered by 1 mg. of methylene blue in a monomolecular layer. Analysis with Cenco-Sheard-Sanford Photelometer.…”

Some Properties of Carbon Black IV Color

“…Evidence Based on Pore Radii, Etc. In the course of their important work on microscopic estimation of particle size by the count method, Gehman and Morris (2) have tentatively accepted the evidence adduced by Bartell and Smith (!) on the particle size as calculated from adhesion tension determinations of high-intensity color blacks.…”

Particle-size distribution of pigment suspensions -- Determination with a beaker-type centrifuge

“…The sedimentation was performed in a 2-liter beaker and the height was 12.5 cm. By means of Stokes' law, the smallest particle that could be completely settled out was calculated by D (microns) = 36.4/vT (9) t = minutes for = 30 minutes, D = 6.6 microns On the completion of the sedimentation period, the suspension was carefully poured off from the sediment, which was reslurried to a height of 12.5 cm. and allowed to stand another 30 minutes.…”