SANDBLASTING
From Wikipedia, the free encyclopedia
Sandblasting or bead blasting is a generic term for the
process of smoothing, shaping and cleaning a hard
surface by forcing solid particles across that surface
at high speeds; the effect is similar to that of using
sandpaper, but provides a more even finish with no
problems at corners or crannies. Sandblasting can occur
naturally, usually as a result of particles blown by
wind causing eolian erosion, or artificially, using
compressed air. An artificial sandblasting process was
patented by Benjamin Chew Tilghman on October 18, 1870.
Historically, the material used for artificial
sandblasting was sand that had been sieved to a uniform
size. The silica dust produced in the sandblasting
process caused silicosis after sustained inhalation of
dust. Several countries and territories now regulate
sandblasting such that it may only be performed in a
controlled environment using ventilation, protective
clothing and breathing air supply (as shown in the top
image).
Other materials for sandblasting have been developed to
be used instead of sand; for example, carborundum grit,
steel shots, copper slag, powdered slag, glass beads
(bead blasting), metal pellets, dry ice, garnet[1],
powdered abrasives of various grades, and even ground
coconut shells, corncobs, walnut shells, and baking soda
(sodablasting) have been used for specific applications
and can produce distinct surface finishes. Some
commercial grade blasters are specially designed to
handle multiple blast abrasives. These blasters are
commonly referred as multi-media blasters.
Sandblasting can also be used to produce three
dimensional signage. This type of signage is considered
to be a higher end product as compared to the flat
signs. These signs often incorporate gold leaf overlay
and sometimes crushed glass backgrounds which is called
smalts.
Sandblasting can be used to refurbish buildings or
create works of art (carved or frosted glass). Modern
masks and resists facilitate this process, producing
accurate results.
Sandblasting technique is used for cleaning boat hulls,
bricks, and concrete work. Sandblasting which is also
known as blast cleaning is used for cleaning industrial
as well as commercial structures.
