KT-532 Flash Red Brown Pigment — Iriodin 532 Direct Alternative

KT-532 belongs to Kolortek's KT-500 Metal Luster Pearlescent Pigment series — a line built entirely around natural mica flakes coated with iron oxide (Fe₂O₃). The color shift across this series is controlled by varying the thickness of that iron oxide layer. KT-532 sits at a red-brown tone with a pronounced "flash" character: meaning the sparkle is bright and directional, not soft or diffuse.

That combination — warm red-brown hue, strong concealing power, and metallic flash — makes it a reliable choice wherever depth and opacity matter in a single pigment. In practice, it performs consistently across organic and solvent-based systems, and disperses without major issues in standard coating and cosmetic bases.

Worth noting: the "flash" designation here is meaningful. This isn't a standard pearl with soft sheen. The light reflection is concentrated and angular — which is exactly what makes it useful in flooring, nail, and decorative paint applications where visual impact at varying angles is a requirement.

Product Specification

KT-532 is part of the broader KT-500 series. Other grades in the series cover colors from gold and copper through to deep bronze and violet, all produced through the same iron oxide coating process on natural mica.

Applications

KT-532 is used across a wide range of industrial and personal care systems. The 10–100 μm particle size range gives formulators flexibility — finer cuts perform well in printing inks and nail applications; the coarser end of the range delivers stronger visual impact in floor coatings and decorative plasters.

• Paints & Coatings — decorative architectural and industrial finishes requiring warm metallic depth
• Epoxy Floors — high-load systems where opacity and flash effect are both needed
• Cosmetics — eye shadows, highlighters, body lotions; compatible with standard cosmetic-grade bases
• Nail Products — gel and traditional lacquer formulations
• Soaps — cold process and melt-and-pour; stable under alkaline conditions
• Printing Inks — fine particle fractions suited to flexo and screen applications
• Craft and Art Materials — resin art, mixed media
• Countertop / Artificial Marble — cast systems requiring color consistency and batch stability

Key Characteristics

A few properties are worth calling out directly for formulators evaluating KT-532 against existing materials:

• Warm metallic luster — the iron oxide coating produces a distinctly warm red-brown tone, different from synthetic mica alternatives that can read cooler or more neutral
• Strong concealing property — higher opacity than standard pearlescent grades; useful where substrate masking matters
• Chemical and physical stability — Fe₂O₃ coatings are inherently stable across a wide pH range and resist heat, making this grade processable in demanding systems
• Batch-to-batch consistency — controlled coating process ensures color and effect repeatability across production runs
• Natural mica substrate — the same base material used in Merck's Iriodin line; relevant for regulatory submissions and existing formulation approvals

Practical Considerations for Formulators

Dispersion is straightforward — KT-532 does not require special dispersants in most systems, though gentle mixing is recommended to preserve the larger flakes that carry the most visual impact. High-shear mixing will reduce particle size distribution toward the finer end and soften the flash effect. This is worth accounting for in process design, particularly for floor coating and resin applications.

In waterborne coatings, some formulators add a small amount of co-solvent to improve wetting. In solvent-borne systems, direct addition works well. For cosmetic formulations, this pigment can be incorporated at the cool-down phase or pre-blended with an oil phase — standard practice for mica-based pigments.

That said, loading levels will depend heavily on the application and desired effect intensity. Starting point recommendations are available on request via TDS.

If you are switching from Iriodin 532 specifically, the substrate chemistry and particle size range are matched. Direct substitution at equivalent loading is a reasonable starting point for most systems, though visual alignment should still be confirmed on your specific substrate and under your application conditions.

KT-532 vs. Iriodin 532 — A Practical Note

The alignment across substrate, coating chemistry, and particle range makes KT-532 a technically defensible drop-in substitute. Buyers sourcing alternatives to Merck mica pigments for cost, supply chain, or regional sourcing reasons will find the transition manageable with minimal reformulation effort.

Frequently Asked Questions

Q: Is KT-532 a true drop-in replacement for Iriodin 532 in cosmetic formulations?
A: The substrate, coating chemistry, and particle size are matched. For cosmetic applications, KT-532 uses natural mica with Fe₂O₃ — the same composition as the Merck reference product. That said, visual confirmation on your specific formula and packaging is always advisable before full production changeover.

Q: What documentation is available for regulatory or supplier qualification purposes?
A: TDS, MSDS, and COA are available on request. Kolortek holds ISO 9001, REACH, SGS, TÜV SÜD, and Kosher certifications. Kosher documentation is relevant for certain personal care and oral care applications.

Q: Can KT-532 be used in waterborne coating systems?
A: Yes. Iron oxide-coated mica pigments are generally compatible with waterborne systems. Mild wetting agents or a co-solvent pre-blend may improve initial dispersion depending on the binder system, but no special treatment is required in most cases.

Q: Is the full 10–100 μm range available, or do you supply selected cuts?
A: The standard grade covers the full 10–100 μm range. If your application requires a tighter cut — for example, fine particle sizes for printing ink or standard particle sizes for floor coating — contact us to discuss availability of specific fractions.

Request Samples or Technical Data

Samples, TDS, MSDS, and COA for KT-532 are available on request. If you are evaluating this as a replacement for Iriodin 532 or sourcing flash red-brown iron oxide mica pigments for a new formulation, reach out directly to discuss quantities, documentation, and lead times.

Contact: contact@kolortek.com