Retroreflective Solid Glass Microspheres - Aluminum Coated Half-Shells
 Coating: Half-shell Aluminum Coating
Core: Solid, Barium Titanate Glass
Specific Gravity: 4.49 +/- 0.01
Index of Refraction: 1.90 – 1.92
Mean Diameter: 40 - 50 microns
Maximum Diameter: 90 - 100 microns
Appearance: Grey powder
Hardness: 55 – 65 on Gardner Scale
Produced under strict quality controls,
these spheres are made from a barium titanate glass that has a
refractive index of 1.91, a specific gravity of 4.49, moh hardness
higher than steel, a crush point of 30,000 psi and a degree of roundness
in excess of 80%. These solid, barium titanate glass microspheres with a 40 - 50 micron mean diameter have a tight distribution, and a top size of 100 microns. The have been hemispherically coated with a thin aluminum shell. In bulk, they appear to be a grey powder. Under a microscope, each individual microparticle can be seen to be a half coated sphere.
Optional Coatings Available at Extra Charge (Silane is stock, Fluorochemical adds 5-10 business days):
- Fluorochemical - Improved hydrophobicity to aide in bringing the spheres to the surface ($10)
- Silane - Improved dispersion ($10)
Downloadable Technical Datasheet
| Product |
Mean
particle size (μm) |
Maximum Diameter (μm) |
Specific Gravity
(g/cm3) |
Index of Refraction
|
25g Vial (Stock)
|
Price/kg
2kg Min
(0-2 wks)
|
Price/kg
50kg Min
(1-2 wks)
|
| P2453BTA |
40-50 |
90-100 |
4.49 |
1.9-1.92 |
$99 |
$113 |
$79 |
We also offer barium titanate glass spheres without aluminum coating.
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P2453BTA is a Prizmalite product distributed by Cospheric LLC.
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