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Blasting involves forcible propelling or spraying a stream of abrasive material, such as sand, grit or soda, against a surface under high pressure, thus removing rust, contaminants, mill scale and old layers of paint. The blasting process roughens the surface to create a better bond for paint or a metallized coating.
Contaminants such as grease, bitumen and certain paints can best be removed with dry-ice blasting. The dry-ice blasting process uses compressed air to accelerate frozen carbon dioxide (CO2), which, upon impact, creates a micro-thermal shock that breaks the bond between the contaminant and the substrate.
Steel and concrete floors can be cleaned easily and efficiently with a portable vacuum blasting machine. Vacuum blasting encapsulates and immediately retrieves residue and blast media, keeping the blasting operation dust free.
In engine rooms and electrical installations, for example, dust poses a problem, but vacuum blasting is not possible. Here, sponge blasting provides an excellent alternative to abrasive blasting.
Grit blasting, also known as sandblasting or abrasive blasting, is a process by which an abrasive media is propelled against a substrate using compressed air or a centrifugal wheel.
Sensitive materials such as glass can become damaged from abrasive blasting. When stripping paint from a window frame, for example, it is therefore wise to opt for soda blasting. This technique is also very suitable for removing dirt and grease from facades, woodwork and machine components.