Natural Mica Based Pearl Pigment – Silver White Series

Kolortek's Silver White Series covers both natural mica based pearl pigments (KT-100 series) and synthetic mica based pearlescent pigments (KT-7100 series). Both product lines share the same structural logic — mica flakes coated with rutile titanium dioxide — but they serve different application environments, and choosing between them isn't always obvious.

What These Pigments Actually Do

The effect comes from interference and reflection. When light hits the TiO₂-coated mica platelet, part of it reflects off the surface and part transmits through — the interaction creates the pearl or metallic appearance. The particle size distribution controls whether you get a fine satin finish or a coarse, high-sparkle effect. It's a straightforward relationship, but one that's easy to get wrong when selecting grades.

When blended with transparent dyes or pigments, these silver whites take on that color while retaining their luster — which makes them highly versatile as a base. Add carbon black and you shift toward a silver-grey metallic appearance with stronger luster contrast. Combine with aluminum paste and you push toward a bright, high-opacity silver-white.

Some grades in this series include tin oxide as part of the coating stack. This modifies the surface electrical properties and improves adhesion in certain resin systems — worth accounting for if you're working with conductive-sensitive formulations.

KT-100 Series — Natural Mica Based

The KT-100 line uses natural muscovite mica as the substrate. It covers a practical range from fine-particle satin grades through coarse-sparkle effects. Natural mica is cost-effective and performs well across most industrial and decorative applications.

KT-7100 Series — Synthetic Mica Based

The KT-7100 series uses fluorphlogopite — synthetic mica — as the substrate. The structural difference matters. Synthetic mica is produced under controlled conditions, which means higher substrate purity, virtually no black spot inclusions, and significantly more consistent flake morphology. In practice, this translates to cleaner whites, better luster reproducibility batch-to-batch, and improved thermal stability in high-temperature processing environments such as plastics compounding or powder coatings.

The KT-7121 to KT-7128 silver sub-series within this line are uncoated fluorphlogopite grades — useful when you need the optical contribution of the mica substrate itself without TiO₂ interference effects.

Where These Grades Perform Well

The application fit depends heavily on which grade you're working with. Fine particle grades (<15 μm to 25 μm) are appropriate for printing inks — gravure, flexo, or screen — where press gap and ink rheology constrain what you can run. They also work in cosmetics, nail coatings, and soap formulations, where texture on skin matters as much as optical output.

Mid-range grades (10–60 μm, 15–75 μm) are the workhorses for paints, coatings, and liquid systems. They orient well under brush, roller, or spray application and deliver a consistent luster without visible coarseness. For epoxy flooring systems and countertop or artificial marble casting, the coarser grades — KT-154, KT-163, KT-183 on the natural mica side, or KT-7107 through KT-7192 on the synthetic side — give the visual depth and sparkle that defines the category. Particle size up to 1000 μm is available in the KT-7191/KT-7192 range for maximum visual impact in cast applications.

Craft applications tend to pull from the mid-to-coarse range depending on the medium — resin pours, decorative finishes, and similar work benefit from broader particle size distributions that create a natural variation in sparkle intensity.

Natural vs. Synthetic Mica: A Practical Comparison

This is the question that comes up most often. The honest answer is that it depends on the application constraints, not on which substrate is inherently superior.

Natural mica based pearl pigments cover the majority of industrial and decorative use cases at a lower cost point. The substrate has minor mineral inclusions — including occasional black spots — which is a natural characteristic of mined muscovite. For most coating and plastic applications this has no measurable functional impact. That said, if visual cleanliness is paramount — think cosmetics, high-gloss white paints, or applications with close color-matching requirements — those inclusions can become a problem at higher loadings.

Synthetic mica (fluorphlogopite) eliminates that issue. The substrate is purer, the flake geometry is more consistent, and the thermal ceiling is meaningfully higher — relevant for plastics compounding above 280°C or for powder coating cure cycles. The luster chroma is also generally cleaner. The trade-off is cost, which is higher than natural mica grades.

In practice, most formulators use natural mica based pearlescent pigments for standard industrial work and switch to the synthetic mica series when the application demands it — not as a default upgrade.

Formulation and Handling Notes

These pigments are platelet-structured. That means dispersion technique directly affects the final optical result. High-shear mixing will fracture the platelets and reduce sparkle — you lose particle size and the effect degrades visibly. Low-shear incorporation, typically by gentle stirring or slow-speed paddle mixing, is the correct approach. Add the pigment last where formulation sequence allows.

Orientation matters in coating applications. In spray-applied systems, allow adequate flow time before cure to let the platelets align parallel to the substrate. Poor orientation = muted luster, regardless of which grade you selected.

These pigments are compatible with most resin systems — waterborne, solventborne, UV-cure, and powder. The SnO₂-containing grades (KT-103, KT-104, KT-111, KT-119, KT-121, KT-152, KT-7108, KT-7109, KT-7192) carry different surface chemistry, which can influence wetting in some formulations. If you're running into adhesion or floating issues, grade selection is worth revisiting before adjusting dispersants.

Typical loading range is 1–10% depending on the system and effect target. Higher loadings don't always improve the visual result — beyond a certain concentration, platelet-to-platelet interference starts working against orientation.