How do you decide what sandblasting grit size to use? This sandblasting media guide shows the many blast media types available. Each has a set of specific uses and characteristics. When you are sandblasting material, make sure it is done correctly. Specific abrasive media are used where another type cannot. Some basic information about abrasive blasting media will help.
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Basically it tells you how aggressive the media is. The more aggressive the grit, the abrasive media, the more work it can perform on the surface. We go into this in extreme detail in this article. However, the question, &#;How is grit measured&#; is easy when you can see how it converts to other units. Some prefer to convert grit to micron and others micron to grit. This is the purpose of the tables above, easily convert between the two. These charts are also often referred to as a grit size chart.
Grit
Mesh
Microns
Inches
43.~.187 (nom.)~.~.~..087 (av.)...................Micro Grit Conversion Chart
Grit
Mesh
Microns
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Inches
- 53.50. 40.5- 44.00. 32.5- 36.00. 25.8- 28.8 400 20.6- 23.60. 16.7- 19.70. 13.0- 16.00. 0. 9.8- 12.30. 0. 6.8- 9.30. 4.5- 6.5 CF1 480.F 400.FF 330.FFF (Coarse) 250.FFF 190.FFFF 110.For grit sizes below 240, physical screens can be used to measure grit. Sieve sizes vary and depending upon the number of screens per inch. Of course, there are more technical resources on this topic, but basically the holes in the sieve screens are 0. inches. Abrasive grit articles that pass through that screen must be, of course, smaller than that diameter fall through. Some particles go through some do not. Therefore a grit number represents a range of particle sizes.
When it comes to sandblasting material, a specific type of media might be useful for some. However, it really comes down to an easy to follow sandblasting media chart. We hope it lays out sandblasting media in an easy to understand format. A popular question is &#;What is the best sandblasting media for rust removal?&#; And of course, the answer is &#; &#;It depends.&#; How thick is the rust, what type of pattern do you want left, what type of blasting system do you have? It is difficult to give an exact answer without details. So, we encourage you to contact us and we can help determine the best media choice for your specific situation.
Media TypeUsesPopular Grit SizesShapeBrown Aluminum OxideEtching, Paint Removal, Surface Preparation80-100AngularWhite Aluminum OxideEtching, Honing, Polishing, Surface Preparation240AngularGlass BeadsAll purpose abrasive, frosting glass, demurring40-325RoundSilicon CarbideEtching hard metals & stone, frosting & etching24-100SharpBlasting GarnetSurface cleaning & Light Deburring55Sub-AngularSandblaster Media | Sandblasting Sand for Sale
Even in our sandblasting media guide, we get a lot of grief on this one. If it&#;s called a sandblaster, then why don&#;t you have sandblaster sand for sale? First, silica sand is known to be a health hazard. Silicosis is a condition in the lungs that is a very serious concern. Hence, we have never and will never recommend sand as an abrasive in a blast cabinet. Next, despite the lack of silica in some sand, we prefer to avoid it altogether. Finally, we offer alternatives to sandblasting sand. No abrasive is safe &#; always read the manuals, always read and understand the risks, and remember you are always ultimately responsible for your own health and safety.
How do you know what size grit to buy for your blast cabinet? Sizing specifications for abrasive grit are based on agreed-upon particle size distribution for each mesh or screen size. Lower mesh numbers means larger, coarser particles. Higher mesh numbers mean the particles are more fine.
Grit is sized by passing it through a series of mesh sieves. Essentially, the Grit Size is determined by how much grit passes through or is retained at certain sieve sizes. The Certified or Inspection Test Sieves each have a number corresponding to a size in the United States Standard Sieve Series (aka USS), with screen openings specified by the American Society for Testing and Materials ASTM E-11 table.
Micro Grit: Any Grit Sizes that are 240 or finer are referred to as micro grit. Because grit this fine is in the sub-sieve size range, they cannot be accurately measured by screening. Micro grit is measured by hydraulic or pneumatic methods. Conversion values for micro grit are calculated using ANSI Standard B74.18 (by sedimentation) at the 50% point.
Micro-fine grit Abrasive media with a Grit Size of 600 or finer is usually only used in wet blast cabinets.
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