A list of Frequently Asked Questions about the use and storage of abrasive media are loosely organized below. Click the question to see its answer in the drop-down box. Please use this as a starting point to perform simple maintenance on your own and to better understand how to use Comco abrasives.

Thank you!

What are the grit-to-micron conversions?


Grit Micron Millimeters Inches
60 250 0.250 0.0098
70 212 0.212 0.0083
80 180 0.180 0.0071
90 150 0.150 0.0059
100 125 0.125 0.0049
120 106 0.106 0.0042
150 75 0.075 0.0030
180 63 0.063 0.0025
220 53 0.053 0.0021
240 50 0.050 0.0020
280 40 0.040 0.0016
320 30 0.030 0.0012
360 23 0.023 0.0009
400 18 0.018 0.0007
500 14 0.014 0.0005
600 11 0.011 0.0004
How do I know what abrasive is best for my application?

An abrasive’s shape, hardness, and particle size really determine the effectiveness of a MicroBlasting application. Each application is unique, and abrasive selection depends on the composition of the targeted part and the application’s desired result. See our Abrasive Media Selection Guide to choose the most appropriate abrasive for your application.

Is sample parts testing available?

We welcome your sample parts for testing in our Applications Lab. Our Technical Specialists can determine the best approach to dialing in your process. They will help you select the right abrasive, the best nozzle, and the necessary blast pressure required to efficiently process your parts.

Contact our Sales Team using the form below or give us a call at 1-818-841-5500 to schedule a sample parts test.

You may want to also review our blog post “We Take Samples Seriously“. It provides an overview of the testing process and includes an example of the report provided upon completion.

Can I reuse abrasive?

Short answer: Please don’t. 

MicroBlasting is extremely efficient and precise, so it is hardly likely you will need to recycle abrasive, but it is important to know the risk involved. Unlike grit or bead blasting, a MicroBlasting system can only cycle abrasive once. Abrasive should not be reclaimed and reprocessed for a second pass because:

  • The blasting process causes abrasive media to break down very quickly. It won’t be the same abrasive on a second pass! 
  • Abrasive easily absorbs any moisture available in the air. It may clump in your blaster! 
  • Pieces of your part’s substrate often mix in and contaminate the abrasive. This could cause uneven results and even damage your part surface. 

Learn more about the dangers of using spent abrasive in our post, “Before Recycling Abrasive…Read this.”

How do I prevent moisture contamination in the abrasive?

Moisture contamination is the number one reason customers call Technical Support. Fortunately, it is usually preventable. There are 4 key ways to keep your abrasive free of moisture:

  1. Store abrasive properly and always make sure bottles are tightly closed when not in use.
  2. Keep abrasive in a cool dry location with minimum temperature fluctuations.
  3. Do not leave abrasive in the blaster’s tank for extended periods of time.
  4. Keep the air supply dry.

Learn more in our tech bulletin, “Moisture Issues – The Importance of Clean Dry Air” and if you have not considered an air dryer, learn more about Air Dryers.

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