Compound Classification
Synthetic and mineral colorants derived from metallic oxides, chromates, and mixed-metal complexes provide chemical inertness, high thermal stability, and opacity across industrial substrates. Formulators select inorganic pigments for outdoor architectural coatings, automotive topcoats, and engineering plastics where organic alternatives degrade under solar ultraviolet exposure. The category includes titanium dioxide, synthetic iron oxides, complex inorganic color pigments, and ultramarine matrices.
Natural earth earths and uncalcined mineral fillers occupy lower performance tiers due to higher impurity profiles and variable tinting strengths. The material family excludes carbon blacks and insoluble synthetic organic azo compounds. Particle size distribution within each batch directly establishes light-scattering efficiency and hiding power.
Crystal Stability
Solid-state calcination at elevated temperatures locks metal cations into rutile, spinel, or hematite crystalline lattices. This thermal synthesis makes the resulting powders impervious to solvent attack, acid rain degradation, and thermal decomposition during high-temperature polymer extrusion. Chemical inertness prevents color shift in aggressive alkaline environments like exterior concrete and masonry coatings.
Dispersion Behavior
Surface treatments using alumina, silica, or zirconia facilitate mechanical wetting in both aqueous and solvent-borne vehicle systems. Uncoated crystals aggregate during storage, requiring intensive mechanical milling to achieve complete color strength and gloss retention. Stabilized dispersions resist settling during prolonged warehouse storage.