The size chart for shot is different; a #5 steel shot will clean differently than a #5 angular grit because of its round shape, which is better suited for stress relief rather than material removal. Medium Grit (40–60 Mesh): The workhorse for general industrial maintenance, offering a balance between removal speed and surface refinement for preparation before painting.
Material Compatibility: How Grit Hardness and Density Affect Blasting Results
Impact on Surface Profile Surface profile is the texture or roughness left on a substrate after blasting, and it is directly dictated by the blasting grit size chart. Coarse grit creates a deep, rugged profile known as a "tooth," which provides a strong mechanical bond for protective coatings like epoxy or zinc.
Using a coarse grit at low pressure will result in inefficient cutting, while using fine grit at high pressure can over-clean and warp thin sheet metal. 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.
Material Compatibility Grit Hardness Density and Surface Profile
Sieve Mesh size, which indicates the number of openings per linear inch, or in microns (µm), which measures the particle diameter. Conversely, fine grit produces a shallow, satin finish that is ideal for cosmetic applications where a smooth, non-reflective surface is required but heavy corrosion protection is not.
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