Metallic pigments are finely divided metal powders or flakes used to impart metallic appearance, colour and functional properties to coatings, inks, plastics and decorative materials. The main families of metallic pigments include: gold bronze pigments (copper-zinc alloys ranging from pale gold to rich copper depending on zinc content), copper pigments (deep reddish-copper tone), aluminium pigments (silver and bright metallic effects), and zinc dust (anti-corrosive primer applications). The choice of pigment type depends on the desired colour, the application method (spraying, printing, mixing into resin), chemical compatibility with the binder system, and the required durability. MEPOSO manufactures atomised metallic pigment powders in various alloy compositions and particle size ranges for coating, ink and decorative resin applications.
Particle Size and Its Effect on Visual Appearance
The particle size of metallic pigments is the primary factor controlling visual appearance. Coarser particles (30-75 micrometres) produce a sparkle effect with high brilliance and visible individual reflections - desirable for decorative coatings and specialty printing. Medium particles (10-30 micrometres) create a smooth satin metallic finish suitable for general industrial coatings and graphic arts. Fine particles (below 10 micrometres) produce a smooth, continuous metallic appearance approaching a polished metal surface, used in high-end automotive coatings and electronics applications. The distinction between leafing and non-leafing pigments is also critical: leafing pigments float to the surface of the coating, creating a bright reflective layer, while non-leafing pigments distribute throughout the film, producing a more integrated metallic appearance. MEPOSO produces metallic pigment powders in multiple size grades to match different application requirements.
Formulation Considerations for Coatings and Inks
Integrating metallic pigments into coating and ink formulations requires attention to several factors. Dispersion stability is essential: metallic particles tend to settle due to high specific gravity, requiring appropriate rheology modifiers and regular agitation. Chemical compatibility must be verified: copper-based pigments can react with acidic binders or certain solvents, causing discolouration or gas evolution. The pigment-to-binder ratio affects both appearance and film integrity: too much pigment produces a rough, poorly bound film, while too little fails to achieve the desired metallic effect. For water-based systems, surface treatment of the pigment particles may be necessary to prevent oxidation and maintain colour stability. MEPOSO provides application guidance on pigment selection, loading levels and compatibility with common binder systems.
MEPOSO Metallic Pigment Powders
MEPOSO S.r.l. manufactures metallic pigment powders in copper, bronze (gold) and brass alloy compositions. Our pigment-grade powders are produced by gas atomisation with controlled particle size distribution, consistent alloy composition and batch-to-batch colour reproducibility. Available in standard industrial grades and custom specifications, our pigments serve the coatings, printing ink, decorative resin and plastic industries worldwide. Contact MEPOSO for pigment samples, technical data and formulation support.
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