What is Sandblasting?
A relatively new method of cleaning newly built masonry is dry sandblast cleaning and one really needs to learn how to sandblast in order to learn all its intricacies and uses. Sandblast cleaning is used and in fact, preferred by architects as well as engineers who typically use it instead of conventional cleaning due to the fact that it does not have adverse effects, like acid reaction. However, there are also still those, such as designers who do not favor sandblasting because they fear that blasting will erode the brick’s face as well as mortar joints. The sandblast operator is very similar to a construction tradesman and a well qualified sandblast operator, who follows instructions properly, will enable sandblast cleaning to be superior to other systems. The basic functions that need to be understood in regards to learning how to sandblast are that it needs the use of portable air compressors, blasting tanks, blasting nozzles, operator’s protective clothing as well as hoods. When l
*Sandblasting is typically used to expose the fine sands in the surface of the concrete. In some instances, it’s used to remove existing sealers, paints and drywall from exterior slabs. The popularity of sandblasting is growing because it leaves new concrete with a timeworn effect resembling the surface of a “sugarcube.” It also mellows out brighter colors by exposing various gray sands and evens out blotchy slabs which can happen with colored concrete. It’s an aged concrete effect that’s being demanded by many consumers.
Sandblasting uses abrasives and forced air to permanently transfer images, designs and words onto glass, stone, granite, marble, brick, wood and metal. These materials, called ‘substrates,’ are covered in a vinyl or rubber resist before sandblasting begins. Using a graphic design program, resists are cut with the image to be sandblasted. Resists both protect the substrate and guide the sandblaster in their work. The combination of abrasive size, resist thickness and air pressure are all important to the final outcome. These three elements are constantly evaluated and adjusted by the sandblaster throughout the sandblasting process. The same image can look very different depending on the substrate and the sandblasting technique used. To learn more about techniques and effects, visit our glossary.
