الوصف

Remove grease, oil and other contaminants preferably using degreasing 
solvent. Blast clean to a minimum of Sa *1/2 Swedish Standard SIS *5 ***0 
with a surface profile not exceeding *5 microns. If Blasting is not possible, 
make full use of mechanical devices along with manual chipping and wire 
Brushing to remove loose rust and scale to St. 2 Swedish Standard SIS *5 
***0. Excessive burnishing of steel is to be avoided. Thoroughly dust down 
all surfaces.