BS6088A and BS6088b size distribution according to British Standard BS6088.

Type	Glass bead quality percentage (%)(um)	Glass bead grand diameter limit
	>1180	0 - 3
	1180-850	5 - 20
BS6088A
	850-425	65 - 95
	<425	0 - 10
	>850	0 - 5
	850-600	5-20
BS6088B
	600-300	30 - 75
	300-180	10 - 30
	<180	0- 15

Polishing agent

sizes in 150-850 micron and 200-400 micron