Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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52 Table I. Impact Media Comparison Chart Metallic Glass Beads Applications: Cleaning, finishing peening—light-medium and deburring Physical Properties: Shape Color Specific gravity Free silica content, % Free iron content, % Hardness (Moh) Media Comparisons: Toxicity Metal removal Cleaning rate Peening ability Finish achieved Surface contamination Suitability for wet blasting Suitability for dry blasting Size ranges available Consumption rate Cost comparison Coarse Abrasives (e.g., sand) General cleaning where metal removal and surface contamination are not considered Spherical Clear 2.45-2.50 None <1 5.5 None Low/none High High Range (various matte) None High High 20-325 U.S. mesh Low Medium Granular Tan 2.4-2.7 100 <1 7.5 High High Fast None Rough anchor High Low High 8-200 U.S. mesh High Low Abrasives (e.g., steel and iron shot/grit) Rough general cleaning and high intensity peening Fine Angular Abrasives (e.g., Cleaning where smooth Organic Abrasives aluminum oxide) (e.g., walnut shells) Light deburring finish and surface contamination are not important Spherical/irregular Gray 7.6-7.8 None 95-100 7.5 None High/medium Medium/high High Peened (shot): rough anchor (grit) High/medium Low High 6-200 U.S. mesh Low High Angular Brown/white 2.4-4.0 <1 <1 9.0 Low High Fast None Various matte High Low High 80-325 U.S. mesh High High/medium Irregular Brown/tan 1.3-1.4 None None 1.0 Low/none None Slow None Smooth Medium/high Low High 60-325 U.S. mesh High Medium/low and cleaning of fragile items

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