Glass beads used in abrasive blasting cabinets come in different sizes just like sandpaper comes in different sizes and grades. 60-100 mesh is the fastest cleaning size, and cleaning time increases as bead size increases or decreases. The larger the bead size the lower the maximum impact velocity, a good rule of thumb is 80 psi maximum blasting pressure for siphon and 40 psi for direct pressure using a pressure pot assembly.
Model# BT 8
U.S. STANDARD SCREEN SIZE: 70-100
MIL. SPEC. (PRF-9954D): No. 8
MIL. SPEC. (S-13165B): 83
BEAD SIZE RANGE (DIA., INCHES) .0083-.0059