During the process of road work, drop glass bead onto the road line painted with thermoplastic paint which is heated to certain temperature while the paint is still wet, thus to increase the reflectivity of road marking. According to the specification of Communication Industry Standard of the People's Republic of China No. JT/T446-2001, the granulometry for drop on glass bead is shown in the table below:
Other parameters keep conformity with the type of intermix.
The glass bead can be produced based on the standard of countries or areas, such as EN1423/1424, AASHTO M247, BS6088, JIS R3301 and KS L2521 etc.
Item: | BS6088A,BS6088B | ||||||||||||
Appearace: | Clean white powder ,Transparent,No obvious impurity | ||||||||||||
Roundness: | BS6088B≥80%,BS6088A≥70% | ||||||||||||
Refractive index: | ≥1.5 | ||||||||||||
Specific gravity: | 2.4-2.6g/cm3 | ||||||||||||
Heavy metal: | <200ppm | ||||||||||||
Contained ratio of magnetic particles | ≤0.1% | ||||||||||||
Diameter (μm) | >1180 | 1180-850 | 850-425 | ＜425 | |||||||||
Micron Size(BS6088A) | |||||||||||||
Standard Retain | 0-3 | 5-20 | 65-95 | 0-10 | |||||||||
(%) | |||||||||||||
Diameter (μm) | >850 | 600-850 | 300-600 | 180-300 | <180 | ||||||||
Micron Size(BS6088B) | |||||||||||||
Standard Retain | 0-5 | 5-20 | 30-75 | 10-30 | 0-15 | ||||||||
(%) | |||||||||||||
SiO2 | Na2O | CaO | MgO | Al2O3 | Fe2O3 | K2O | |||||||
Chemical Analysis | |||||||||||||
72.32% | 14.31% | 7.51 | 1.35% | 2.4% | 0.061% | 1.20% | |||||||
% | |||||||||||||
