The more dense a substance is, the higher specific gravity it will have. There are four basic shapes in abrasives: angular, sub-angular, sub-rounded, and rounded. Angular abrasives have many facets, and several jagged faces and vertices. Examples of angular abrasives are crushed glass and certain types of slag.
Angular abrasives are good for stripping corrosion and rust. Sub-angular abrasives have some jagged edges, but less than angular types. Some abrasives that fall in this category include garnet and plastic urea. Sub-rounded abrasives are not quite smooth, and the jagged edges are almost gone. This type of abrasive include staurolite and walnut shells.
Rounded abrasives are smooth, or may even be spherical. Glass beads or steel shot would be examples of rounded abrasives. Usually, rounded abrasives are used for removing mill scale from hot rolled steel or thin factory coatings. Rounded abrasives create a dimpled profile, like the surface of a golf ball. This is also known as peening. Angular and sub-angular abrasives create deeper, more pronounced anchor patterns. When the blasted abrasive hits the surface, two things happen: an indentation is made in the surface, and part of the surface is pushed up around the indentation.
For every action, there is an opposite and equal reaction. The indentations in the surface are known as valleys ; the part of the surface pushed upwards are known as peaks. The distance between the top of the peak and bottom of the valley is known as a depth profile.
It uses lead-free soda lime-type glass in rounded ball shapes. Glass bead media has many advantages over other types of abrasive blasting media. Aside from the attractive finish, blasting with glass beads feature other benefits, including:. If you have a particularly tough material, glass beads may take a little longer to get the job done.
They also will not provide any etch to the surface. Glass beads can help you achieve a uniform surface finish without changing the dimensions of a part. One unique application for glass bead blasting is peening, which helps the metal better resist fatigue and cracking from stress corrosion. One study found that it can increase fatigue strength by about It gives you an attractive satin finish while increasing the durability of the product.
Sand includes silica, which forms as dust when the sand erodes and poses a significant health hazard to those working with it. Silicosis is a deadly condition that affects people who breathe in these chemicals. The measures you need to take for sandblasting media and using silica safely are extensive, so it is often much easier and more beneficial to use another blasting media that fits your application.
Most of the benefits of using silica sand for sandblasting media can be met with the use of other materials. Part of its previous use is due to its sharp edge and uniform size. Sharretts Plating Company now offers abrasive blasting among its metal finishing processes. We are also available to provide reliable media selection advice. Benefits of Electroplating. Home Blog. They also provide the additional benefit of being biodegradable, making them among the most environmentally-friendly blasting media.
Glass beads are typically made from fine soda-lime glass that places minimal stress on the surface material. Contact Us. Products Back Back. Back Back. How to Choose the Right Blast Media. Choosing the Right Abrasive Media. These are the factors to consider when choosing your abrasive. Surface Characteristics. Example: Garnet An mesh garnet particle leaves up to 3.
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For details, view our Privacy Policy. The Anchor Pattern. Blast Media Properties. Crushed glass Coal slag. Olivine Plastic Garnet. Staurolite Walnut. Glass bead Silica sand. Blast Media Descriptions.
Silica Sand. Crushed Glass. Mineral Sands. Coal Slag. Glass Beads. EcoQuip 2 - Mobile View Details. EcoQuip 2 - Skid View Details. EcoQuip 2 - Trailer View Details. Previous Slide Next Slide. How To. The Basics. Contact an Expert We'll help you choose the right product for your job. Tech Support Monday-Friday a. Central Time
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