The grit size chart must be cross-referenced with the material compatibility chart to avoid using a grit that shatters prematurely or damages the substrate through excessive aggression. While grit (such as aluminum oxide or silicon carbide) has sharp edges that cut into the surface for aggressive cleaning, steel shot relies on deformation to create a peened, hardened surface.
Surface Preparation Grit Size Decision Chart for Abrasive Media Selection
The chart provides the starting point, but the operator must adjust the air supply and machine settings to match the specific grade being used. Material Compatibility Hardness and density are the two physical properties that determine how a blasting grit interacts with a workpiece.
Fine Grit (80–120 Mesh): Used for final cleaning and light surface refinement, suitable for achieving a smooth finish on delicate substrates or preparing surfaces for high-gloss paints. Applications by Grit Category Different projects demand specific categories of grit, and the blasting grit size chart is organized to reflect these functional groupings.
Surface Preparation Grit Size Decision Chart for Abrasive Media Selection
Coarse Grit (10–30 Mesh): Reserved for heavy-duty operations such as stripping thick rust, mill scale, or old industrial coatings from steel beams and structural metal. Medium Grit (40–60 Mesh): The workhorse for general industrial maintenance, offering a balance between removal speed and surface refinement for preparation before painting.
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