PVD Aluminum Pigments: Superior Brilliance for Coatings ...
Jun 01, 2000 · The Hall process (see Figure 1) is based on the milling of fine, spherical or irregular atomized aluminum powder (see Figure 2) in ball mills (see Figure 3) in the presence of steel balls, a suitable lubricant (normally stearic or oleic acid), and an aliphatic hydrocarbon,, white spirit.