I 



^-SURFACE PROFILE 



Z81LTT) 



BASE METAL 



1 





DESIRED BLASTING PROFILE 



1 



12.7^171 



.-—SURFACE PROFILE 



^~~^— -^~^C^^ 



BASE METAL 





BLASTING PROFILE NOT DESIRED 



Figure 95. Surface blasting profiles. 



Table 47. Types, sizes and resulting profile of 

 abrasives used in airblast equipment. 





Maximum 









particle size 







Abrasive 



passing through 

 ASTM mesh 



Average heigh 



t of profile 



(mils) 



(urn) 



Sand, very fine 



80 



1.5 



40 



Sand, fine 



30 



2.0 



50 



Sand, medium 



18 



2.5 



65 



Sand, large 



12 



2.8 



70 



Steel grit #G-80 



40 



1.3 to 3.0 



30 to 75 



Iron grit 3G-50 



25 



3.3 



85 



Iron grit #G-40 



18 



3.6 



90 



Iron grit #G-25 



16 



4.0 



100 



Iron Grit #G-16 



12 



8.0 



200 



Steel shot #S-170 



20 



1.8 to 2.8 



45 to 70 



Iron shot #S-230 



18 



3.0 



75 



Iron shot #S-330 



16 



3.3 



85 



Iron shot #S-390 



14 



3.6 



90 



336 



