When viewed without magnification, the surface shall be free of all visible oil, grease, dirt, dust, mill scale, rust, paint, oxides, corrosion products, and other foreign matter. Slight residues of rust and paint may be left in the lower portion of pits if the original surface is pitted. The surface profile shall not be less than 1 mil (25 microns).
In areas where an abrasive blast is desirable but impractical, Power Tool Cleaning to Bare Metal may be used to prepare the surface. Prior to blast cleaning, visible deposits of oil and/or grease should be removed by power washing or other agreed upon methods. In addition, sharp fins, edges and weld spatter should be removed. This method may be used to produce a surface profile in small areas.
Surface cleaning power tools are generally impact or profile producing power tools, to which any of the following type of media can be attached: non-woven abrasive wheels and discs, coated abrasive discs, flap wheels, needle guns or other devices. 3M Scotch-Brite Surface Conditioning Products line can provide this type of abrasive media to be mounted onto power tools.
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