Sieve Mesh size, which indicates the number of openings per linear inch, or in microns (µm), which measures the particle diameter. 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.
Steel Shot Versus Abrasive Grit: Understanding the Key Differences
Medium Grit (40–60 Mesh): The workhorse for general industrial maintenance, offering a balance between removal speed and surface refinement for preparation before painting. Understanding Grit Size Standards The blasting grit size chart operates on a numerical system that can appear counterintuitive to the uninitiated.
The size chart serves as the essential roadmap, translating the abstract concept of "coarseness" into specific, measurable particles that achieve the desired surface profile. 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.
Steel Shot Versus Abrasive Grit: Understanding the Key Differences
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. The chart provides the starting point, but the operator must adjust the air supply and machine settings to match the specific grade being used.
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