Phosphorescent microspheres in particle sizes 10 to 600 microns are now available from Cospheric LLC. These phosphorescent particles are 90% spherical and appear to be off-white under ordinary daylight or regular room illumination.? However, when the lights are turned off these phosphorescent particles exhibit phosphorescent yellow-green after-glow.
The spheres have tight particle size distributions and are > 90% within size range.? Polymer spheres that incorporate proprietary phosphorescent ingredient have a melting point of 115?C , and are mechanically stable past 90?C.? Phosphorescent beads are also inert in most solvents.
Intensity according to DIN 67510-1
800 mcd/m2 at 1 minute
180 mcd/m2 at 5 minutes
90 mcd/m2 at 10 minutes
12 mcd/m2 at 1 hour
5 mcd/m2 at 2 hours