ForMatter/Processes/finishing/Sandblasting (Abrasive Blasting)
proc_sandblasting

Sandblasting (Abrasive Blasting)

finishing · abrasive blasting, bead blasting, shot blasting, soda blasting, media blasting

Compressed air shoots an abrasive — sand, glass beads, baking soda, walnut shell — at a surface to clean, etch, or texture it. The matte finish on most consumer-electronics aluminum is bead-blasted. Also strips paint, removes rust, and frosts glass.

Pneumatic propulsion of abrasive media against a workpiece. Media selection sets the result: silica sand (now restricted — silicosis hazard) for aggressive cleaning, glass bead for matte finish without dimensional change, aluminum oxide for cutting, soda for delicate stripping, walnut shell for organic-substrate cleaning.

Scale & Tolerance

  • scale (mm)5 – 50000
  • tolerance (mm)0.05
  • skillbeginner — operator wears respirator and stands at the cabinet
  • costvery low per part; capital cost low

Equipment

  • school_shopyes — bench-top blast cabinets are standard shop equipment
  • professionalwalk-in blast booths, pressure-pot blasters
  • industrialshot-blast through-feed conveyors for steel descaling

Environmental

  • energy_usemoderate (compressed air)
  • waste_streamspent media + removed surface contaminants — must be characterized for hazardous-waste disposal
  • consumablesmedia (recyclable through several cycles), filter elements

Citations

  • book · Lefteri, *Making It: Manufacturing Techniques for Product Design*, 2nd ed. (Laurence King, 2012), 'Sandblasting' p. 267.