The particle size of national standard glass beads is relatively small, and the initial reflective effect is average. However, during the wear process, the retroreflective coefficient decays relatively slowly, making it suitable for sections of road with higher requirements.
The American standard Type III glass beads have a particularly large particle size and a higher initial retroreflective coefficient. They are usually used in combination with national standard glass beads or ordinary glass beads, and it is not recommended to use them alone.
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