Glow in the Dark Pigment Powder Fine Particle

Glow in the dark pigments absorb ambient light — sunlight or standard interior lighting — and re-emit it as visible luminescence after the light source is removed. The core mechanism is photoluminescence: the pigment crystal stores excitation energy and releases it gradually, producing that characteristic afterglow effect.

Two base chemistries are represented in this range. Strontium aluminate grades offer higher brightness and longer glow duration — the dominant choice for most commercial applications today. Zinc sulfide grades produce softer, lower-intensity emission and are typically used where cost or specific application constraints make them the practical option.

In practice, particle size is one of the more important specification decisions. Finer grades (5–25 μm range) disperse more easily in thin-film systems like nail gels and printing inks but sacrifice some glow intensity. Coarser grades (65–75 μm) deliver stronger afterglow but require more open substrate geometries. Most coating and plastic applications land somewhere in the 20–50 μm range.

Product Series Overview

The table below covers the full model range with key specification points. Water-based designations indicate grades with either native water compatibility or waterproof surface treatment.

Applications

These pigments cover a fairly wide application footprint. The most common end uses:

• Paints & coatings — decorative and functional coatings, safety markings, egress path indicators. Not suitable for automotive topcoat applications.
• Printing inks — screen printing, pad printing, and flexo where luminescent effects are required. Fine particle grades (10–25 μm) are better suited for fine mesh screens.
• Nail products — gel nail formulations, nail lacquers. Fine particle grades and cosmetic-grade variants are the relevant options here.
• Decorative cosmetics — limited to approved grades; always verify compliance documentation before use.
• Craft and hobby products — high-volume, lower-specification applications where zinc sulfide grades are often cost-competitive.
• Fishing tackle and accessories — lures, floats, and related items where underwater visibility matters.
• Safety and wayfinding — stair edges, switch plates, emergency route markers in low-light environments.

Key Characteristics

A few things worth understanding before selecting a grade:

Color range: The visible emission color under darkness is not the same as the daylight color of the powder. Yellow-green emission grades, for instance, may appear off-white or light green under daylight. The full range covers yellow-green, blue-green, sky blue, violet, purple, orange-yellow, pink-orange, orange-red, and red — giving formulators meaningful flexibility for branded or differentiated products.

Water-based compatibility: Standard strontium aluminate grades are moisture-sensitive and will degrade in aqueous systems over time. The water-based and waterproof-treated grades in this series address that directly. KT-GYG-10, for example, carries a surface treatment that makes it compatible with water-borne coatings and inks without the glow degradation issues that untreated grades exhibit.

Strontium aluminate vs. zinc sulfide: This is a meaningful decision. Strontium aluminate delivers substantially higher brightness and longer afterglow duration. Zinc sulfide grades are dimmer but remain relevant in price-sensitive applications or where regulatory or formulation constraints apply. Don't default to strontium aluminate without confirming it fits the budget and use case.

Glow duration and intensity: Both depend on excitation time, excitation source intensity, and pigment loading. There is no substitute for running your own charging tests in the intended substrate and film thickness.

Practical Formulation Considerations

Dispersion is straightforward by effect pigment standards — these are denser than typical pearlescent flakes and will settle in low-viscosity systems. Thixotropic additives or periodic agitation are standard practice for coating and ink formulations.

Loading rates vary by application. In coatings, 10–30% by weight is a common starting range; in nail gels, lower loadings are typical depending on the film build. Higher loading generally improves glow output up to a point — beyond that, particle crowding in the film limits further gains.

That said, milling or high-shear dispersion should be avoided. These pigments are crystalline and will fracture under aggressive mechanical energy — smaller particles mean reduced glow output. Low-shear mixing is the standard approach.

For printing applications, the practical lower limit for mesh screen printing is typically around 10–12 μm particle size. Grades in the 30–50 μm range are better suited to screen printing with open-mesh fabrics or for thick-film applications like pad printing and casting.

Worth noting: avoid strongly acidic systems with the standard strontium aluminate grades. Acid conditions will degrade the crystal structure. pH range of 7–9 is generally safe. The waterproof-treated grades offer somewhat broader pH tolerance, but it's still worth confirming with the specific formulation.

Strontium Aluminate vs. Zinc Sulfide — At a Glance

Frequently Asked Questions

Q: Can these pigments be used in water-based coating systems?
Standard strontium aluminate grades are not suitable for direct incorporation into water-borne systems — moisture degrades the luminescent crystal over time. The designated water-based grades (KT-GBG02-2, KT-GYG03-2, the KT-GYG-10 waterproof-treated grade, and the full KT-GYG-05 through KT-GBB-04 water-based series) are formulated for aqueous compatibility. Always confirm with the specific grade before scaling up.

Q: Which grade is appropriate for cosmetic or nail applications?
For decorative cosmetics and nail products, finer particle grades in the 5–25 μm range are generally more appropriate from a texture and application standpoint. Compliance documentation — MSDS, TDS, and relevant safety certifications — should be reviewed and verified against your market's regulatory requirements before use.

Q: What loading rate should I start with?
For most coating applications, a 10–20% loading by weight in the final formulation is a reasonable starting point for a glow powder like this. Glow output scales with loading and film thickness, but there are diminishing returns at higher concentrations. Practical testing in your specific system and substrate is the only reliable way to optimize this.

Q: Are these pigments suitable for use in automotive coatings?
No. These are not recommended for automotive topcoat applications. The durability, UV exposure, and processing conditions typical of automotive coatings are outside the suitable application range for this product series.

Documentation & Support

MSDS, TDS, and COA are available for all models. Formulation guideline support is available for qualified development inquiries. Custom packaging and private labeling are supported for volume orders.

To request samples, technical documentation, or pricing, contact the Kolortek technical sales team with your target application, system chemistry, and volume requirements — this allows for a more useful product recommendation rather than a generic response.