Details:Physical reference
1. material: Composition Sio2>72%
2. round percentage>80%
3. dia. 53 to 1200um
4.Density: 2.4~2.6g/cm3
5. microhardness :537kgf/mm3
Hardness (Mohs hardness) :6-7
6..Refractive index :1.55-1.8
7.standard: YZQB-004-1999, SAE,CSME006/M001
8. authentication: MA / CNAL,SGS
9. PATENT NO.:ZL021290733
10. crystal pure no color.Appearance Colorless and Transparent ball,no visible bubbles and impurity

Specification
（mm） Appearance Specific Gravity Roundness Luminance
Coefficient Packing
Common
glass bead 0.05-0.09
0.09-0.12
0.15-0.25 free of color, transparent,
clean,
globosity 2.4-2.6g/cm3 >90% ≥2.20 Cardboard Box25kg/box
High
luminance
glass bead 0.05±10%
0.09±10%
0.12±10%
0.15±10%
0.25±10% high luminance globosity, no impurity,
grains are
uniform 2.5-2.9g/cm3 >95% 2.20-2.60 Iron Bucket
25kg/bucket