Many industries benefit significantly from this type of abrasion, as it offers effective cleaning without destroying the item. The abrasives are made from crushed urea, polyester or acrylic plastic.
Hardness and particle size can vary, but they are angular pieces. They may work more slowly on softer materials. Plastic abrasives are common in delicate applications or cleaning. You may find them used for paint stripping, mold removal, deburring and deflashing. They are useful in stripping paint because of their safety advantage over chemical stripping and their general effectiveness.
The materials that are often used with plastic abrasives include:. Industries such as automotive, aerospace, marine and electronics use plastic as a blasting media.
Often, these industries create sensitive components that cannot have their substrate material modified. Plastics make this possible. Projects across industries have unique needs, and the blasting media that you use on them can make a big difference. Be sure to weigh the pros and cons of each media to determine which one will work best with your material. We find that many applications can benefit from glass bead blasting. Whether you need to finish a metal, add texture, remove paint or mold or prepare a surface for coating, glass bead blasting is often an excellent option.
If you need glass bead blasting, contact the experts at Hard Chrome Specialists. For more information about our process, and to learn how it can benefit your parts, contact us today.
Guide to Abrasive Blasting Media. Glass Bead Blasting Glass bead blasting is a versatile approach to abrasive media blasting that offers an attractive satin finish and works for a variety of purposes. Some people prefer an anchor profile, while others will want a smoother surface. For example, if you are stripping a car to be repainted, you'll probably want to leave an anchor profile for the new paint to adhere to.
If you are simply cleaning calcium deposits from a pool — which will not be repainted — leaving a profile is unnecessary. Most abrasive is measured with mesh size. During production, it gets shaken through various screens. These screens might have as little as 20 holes per square inch, or as many as A common misconception is that the coarser glass will help you get through a job faster. However, because it's so coarse, you're only getting half as many particles of glass in the same size bag.
You'll end up using twice as many bags to get the job done, which is not only expensive, but inefficient! It's a much better idea to increase abrasive density if you want to complete the job faster.
Understanding the weight or bulk density of the media you are using will also help decide which is best for the process.
The heavier the media, the more impact it has on the surface you are blasting. Imagine a golf ball and a ping pong ball. They are the same shape and size, but the golf ball is more dense. If you threw them at someone, the golf ball would hurt a lot more. Crushed glass has a bulk density of lbs per cubic foot— while garnet weighs around lbs per cubic foot. So, the two abrasives at the same mesh size and blast pressure will have different results. The harder and heavier the abrasive is, the rougher the profile will be.
Using larger, more coarse abrasives will decrease the run time in your machine. A larger mesh size will be more aggressive so it will have more of an impact to the surface you are blasting.
The deciding factors would be speed and end result of the substrate you are stripping. Understanding the impact of different abrasives will help in deciding the best media for the job. The following chart will explain the characteristics of various media types. The ideal rate for blasting reuse is for direct pressure to reach the maximum abrasive impact velocity at half the blasting pressure of the siphon. When blasted, this media disintegrates into particles too small to recycle.
On the other hand, media that is higher on the hardness scale can be reused, and are therefore categorized as multiuse media. The harder the material, the longer it is effective.
This abrasive blasting media can be passed multiple times before it breaks down into particles that are too small to work. The life span of blasting media varies based on a number of factors, including the application and use patterns such as the following:. Using a blasting media past its ideal recycle rate will slow down processing.
Be sure not to overuse an abrasive — it will need to be replaced eventually, even if there is still some left. First, it can greatly reduce consumable expenses. Abrasive media like steel grit can be used hundreds of times, saving hundreds to thousands of dollars. In order to recover blast media for reuse, there are several options available. There are two types of vacuum sandblasting recovery systems, one of which allows you to blast and then use a vacuum attachment to pick up the spent media.
This allows for more media recovery and is one of the quickest recovery methods. However, this system uses a lot of compressed air and is therefore limited to less abrasive media. This system is the fastest and best for portable media recovery. The other method uses vacuum recovery that operates continuously to suction media. While this method is slower than the other because the system is blasting and vacuuming at the same time, it prevents media spillage and is best for smaller or indoor work that must keep sandblasting dust generation to a minimum.
Similarly, there are also two mechanical and pneumatic recovery systems. The pneumatic system delivers the sandblast media to a reclaimer through the movement of air. It then filters out anything too small or foreign for the blaster and returns the reclaimed media to a sandblast pot so it can be blasted again.
These systems are great for abrasive media such as glass beads, plastics, aluminum oxide and smaller steel grit sizes. A mechanical sandblasting recovery system is most commonly used with steel grit, as it is able to easily deliver the heavy media to a blast pot.
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