Comparison between abrasives and the finishing surface The abrasive media may be aluminum oxide grains with sharp edge, Slightly soft and cheap silica powder, round glass beads and plastic grains that won't damage workpiece during finishing operation, etc. The abrasive grains selected for sand blasting may vary with its application and it approximately ranges #16 ~ # 2000 according to its application purpose.

Compare and contrast between processing surfaces

Microscopic portrait of abrasive

Nozzle of spray gun and compressed air Blast nozzle at blast gun compressed and air is 2 ~ 4 KG/CM2 as standard for soft metal workpieces. Dissection chart of spray gun

Volume of air needed for injection processing Gauge of nozzle m/m Gauge of vacuum pipe m/m Exerted pressure (kg/cm2) 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6 3.0 0.19 0.23 0.28 0.31 0.34 0.38 0.42 0.46 0.47 0.51 7 3.2 0.26 0.32 0.38 0.44 0.49 0.55 0.59 0.65 0.70 0.76 8 4.2 0.32 0.41 0.49 0.51 0.63 0.71 0.75 0.82 0.87 0.98 9 4.5 0.41 0.50 0.60 0.69 0.78 0.86 0.96 1.02 1.08 1.25 10 5.2 0.56 0.68 0.78 0.91 1.03 1.13 1.24 1.26 1.46 1.56 Compare and contrast before and after processing