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Glass Beads

Glass Beads as per BS 6088 standard is used in Thermoplastic Road Marking material.

Gradation - The glass beads shall meet the gradation requirements for the two types as given in Table.

 
Sieve Size Percent Retained
Type 1 Type 2
1.18 mm 0 to 3 -
850 micron 5 to 20 0 to 5
600 -do- - 5 to 20
425 -do- 65 to 95 -
300 -do- - 30 to 75
180 -do- 0 to 10 10 to 30
Below 180 micron - 0 to 15
 

Roundness - The glass beads shall have a minimum of 70 per cent true spheres.

Refractive Index - The glass beads shall have a minimum refractive index of 1.50.

Free flowing properties - The glass beads shall be free of hard lumps and clusters and shall dispense readily under any conditions suitable for paint striping. They shall pass the free flow-test.


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