Phosphorescent Pigment Powder Long Afterglow

This is a light-storing pigment built primarily on strontium aluminate and zinc sulfide chemistries. It absorbs light energy and slowly re-emits it as visible glow once the source is removed. Strontium aluminate grades deliver the longest, brightest afterglow; zinc sulfide grades fill specific color positions like orange-red and yellow that aluminate systems don't cover as easily.

In practice, the right grade comes down to two things: target glow color and the carrier system you're working in. We stock both standard SC-series powders and waterproof-treated grades intended for water-based formulations.

Product Series & Models

Applications

The range covers a wide spread of end uses across coatings, inks, and craft work:

• Paints and coatings (not suitable for automotive coatings)
• Printing inks — fine particle grades like KT-GTG01 SC disperse and lay down better at low film thickness
• Decorative cosmetics and nails
• Craft art and decorative projects
• Fishing widgets and lures
• Safety and visibility marking in work and home environments
• Building material — see Kolortek Colorful Luminous Sand for aggregate-style applications

Key Characteristics

Glow color and afterglow length depend on the chemistry and grade you select.

• Charge and release: the night glow powder absorbs light energy from sunlight or interior lighting, then slowly emits it once the source is gone.
• Color range: blue, blue-green, yellow-green, purple, violet, orange, pink-orange, and red.
• Water-based options: several grades are formulated or waterproof-treated for water-based systems.
• Particle size choices: from fine (5–25 μm) for printing to coarse (65–75 μm) where higher glow output matters more than surface smoothness.Practical Considerations

Worth noting: strontium aluminate grades are sensitive to water over time. If your system is aqueous, choose a waterproof-treated grade such as KT-GYG-10, or one of the dedicated water-based models — using an untreated grade in water can degrade glow performance.

For glow brightness, loading and particle size both matter. Coarser particles store more energy per grain and glow longer, but they settle faster and can roughen thin films. In transparent or translucent carriers, a phosphorescent glow powder performs best because the stored light isn't blocked by opaque pigment. Keep loadings high — these pigments typically run at 20–35% in the final system to read clearly in the dark.

This phosphorescent powder is not suitable for automotive coatings.

FAQ

How long does the glow last?
Strontium aluminate grades give the longest afterglow, fading gradually over several hours after a full charge. Zinc sulfide grades glow for a shorter period but cover colors such as orange-red and yellow.

Which grade should I use in a water-based paint or ink?
Use a waterproof-treated or dedicated water-based grade — KT-GYG-10, KT-GBG02-2 SC, or any of the water-based models. Untreated strontium aluminate will lose performance in water over time.

Can it be used in printing?
Yes. Fine particle sizes such as 5–25 μm grades are suited to printing where film thickness is low and surface smoothness matters.

Is documentation available?
MSDS, TDS, and COA are available, along with formulation guideline support for your specific system.

Request Samples

Tell us your target glow color and carrier system, and we'll recommend a grade and send samples for evaluation. Reach out at contact@kolortek.com to discuss your project.