A coating is only as good as the preparation of the underlying surface.
Professional wet abrasive blasters know that choosing the right abrasive is key to achieving a coating application that lasts. With the right abrasive, you’ll maximize profits by getting the job done faster while expending the minimum volume of abrasive.
These are the factors to consider when choosing your abrasive.
1) SURFACE CHARACTERISTICS
As a general rule, the blaster should use the finest abrasive necessary to attain the required surface preparation characteristics. A fine abrasive will give you more impacts per volume. The more particles in the stream, the more work is accomplished in the same time. When blasting concrete or wood, you don’t need a hard, expensive abrasive, or a coarse particle: crushed glass makes an excellent, inexpensive choice for work on relatively soft surfaces.
However, when preparing iron and steel for a protective coating system, there are additional considerations. Coatings adhere poorly to hard, flat surfaces, so the blaster is required to develop a pattern of indentations that the coating can anchor to, aka the anchor pattern.
2) ABRASIVE PROPERTIES
Knowing the surface characteristics and the profile depth you need to achieve, you are ready to select your abrasive. There are four properties of abrasives that contribute to profile depth: size, shape, hardness and density.
For more information on choosing abrasive; visit Blast Journal’s link below: