Reflective Glass Beads:
The glass beads shall be transparent colourless and free from milkiness, dark particles and excessive air inclusion. These shall conform to the requirement spelt out in clause 803.4.2.3 of MORTH&H.
Gradation: The glass beads shall meet the graduation requirements for the two types as given in the following table 800-10.
Table 800-10: Gradation Requirement for Glass Beads
| Percent Retained | ||
| Sieve Size | Type 1 | Type 2 |
| 1.18 | 0 to 3 | 0 to 5 |
| 850 Micron | 5 to 20 | 0 to 20 |
| 600 Micron | — | 5 to 20 |
| 425 Micron | 65 to 95 | — |
| 300 Micron | — | 30 to 75 |
| 180 Micron | 0 to 10 | 10 to 30 |
| Below 180 Micron | — | 0 to 15 |