2017 OSHA Silica Dust Exposure & Control Regulations .
Some professional services specify lower resolutions for image sizes, so you could get away with smaller image sizes. Kodak, for example, suggests these resolution/file sizes: For a 4" x 6" print, the image resolution should be 640 x 480 pixels minimum. For a 5" x 7" print, the image resolution should be 1024 x 768 pixels minimum.Aug 21, 2017 · Here is a chart table showing how Roughness Grade Numbers convert to Ra numbers: Roughness Grade Numbers and Ra Measures. Surface Roughness of Abrasive Grits and Sandpaper. One approach to Surface Finish is to use abrasives or sand the surface. This chart converts from abrasive grit to Surface Finish Ra values: Surface Finish Math and Equations