Sandblasting

Sandblasting, sometimes known as abrasive blasting, is the operation of forcibly propelling a stream of abrasive material against a surface under high pressure to smooth a rough surface, roughen a smooth surface, shape a surface or remove surface contaminants. A pressurised fluid, typically compressed air, or a centrifugal wheel is used to propel the blasting material. The first abrasive blasting process was patented by Benjamin Chew Tilghman on 18 October 1870.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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Marine coatings, hull protection, and the calculators behind a well-painted vessel.

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