The airport glass bead used for airport runway efficiency provides the brightest and safest airfield marking available.
These beads are coated with a layer of aluminum on half sphere, provide five to seven times the retro-reflectivity of ordinary glass bead.
The larger gradation size,higher percentage roundness, smooth surface and hardness qualities enhance the long-term reflective performance of airport markings even under wet or night conditions.
Specification:
composition
|
Program
|
SiO2
|
CaCO3
|
Al2O3
|
MgO
|
Na2O
|
Fe2O3
|
|
GLASS BEAD
|
72-76%
|
25-27%
|
0.8-1.0%
|
1.0-1.5%
|
1.3-1.5%
|
0-0.9%
|
Other spec:
Refractive index: 1.7-1.8
Roundness: ≥ 85%
Appearance: sliver grey
Size Range: 300-500um
Density: 2.2±0.1 g/cm3
Hardness(Mohs) : 6.5
Softening point: > 500 ℃