Sand blasting standards: Swedish SA 1, SA 2, SA 2.5, SA 3 vs.
SA 2. thorough blast cleaning:Commercial finish 65% clean. The surface shall be free from visible oil, dirt and grease, from poorly adhering mill scale, rust, paint coatings and foreign matter. Any residual contamination should be firmly adhering. SA 2.5. very thorough blast cleaning: Near white metal 85% clean.