Steel Grit


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  • Manufactured cast steel abrasive
  • Used mainly in airless wheel blast machines
  • Blue grey, angular granules (GL = blue-ish color, GH = grey-ish color)
  • Can be recycled many times
  • High performance, cleaning, and descaling abrasive
  • Sharp edges gradually round over as it wears
  • GL and GH hardness grit are most common
  • Special GS* and GM* hardness (and other specifications) available by special request
  • Manufactured to conform to: SAE J444, SAE J1993, SFSA 20-66
  • BlastOne Represents Ervin
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Steel grit abrasive media is a high performance cleaning and descaling abrasive media. Used prominently by in blastrooms or in the field with complex grit recycling units.

Cast steel grit has a sharp edge that will gradually round over as the abrasive is recycled. if you specification calls for a consistent profile, you should select a hard grade of steel grit, as this will maintain its sharp working edges. It is important to have a good working mix when working with steel grit, as the grit continues to round off, and adding new particles to the mix on a consistent basis will ensure that your profile will remain constant.

Selecting the hardness of the steel grit is very important as just stated. However the softer the grit the longer it lasts… as a soft steel grit will quickly “Round” and loose its blasting effectiveness.

In theory, the following table can be used as a guide for how long the grit will last.


Grit Hardness Rockwell Hardness Grit Recycles @ 110psi
GH 60-65 HRc 100
GL 56-60 HRc 300
GM 47-56 HRc 400
GS 40-51 HRc 500

*for most Blastroom applications we recommend GH Hardness grit, as it will maintain your profile required.


Most Common uses of Steel Grit include:

  • Pipe/Rebar Coating
  • Railcar – New & Repair
  • Bridges/Water Towers
  • Storage Tanks – Oil and Gas
  • Marine – Ship Building and Repair

Other Less Common Uses of Steel Grit include:

  • Foundry – casting cleaning
  • Structural Steel

Not applicable for:

  • Shot Peening
  • Aluminum or Stainless


Chart Showing Steel Grit Particle Sizes and the typical profile that can be expected.

Grade Particle Size Typical Profile with Air Blast @ 100psi
GL120 0.0049″– 0.0117″   (0.125 – 0.300mm) 1.5 mils
GL80 0.0070″– 0.0165″   (0.180 – 0.425mm) 1.5 mils
GL50 0.0117″– 0.0278″   (0.300 – 0.710mm) 2 mils
GL40 0.0165″– 0.0394″   (0.425 – 1.000mm) 3 mils
GL25 0.0278″– 0.0469″   (0.710 – 1.180mm) 4 mils
GL18 0.0394″– 0.0555″   (1.000 – 1.400mm) 5 mils
GL16 0.0469″– 0.0661″   (1.180 – 1.700mm) 5.5 mils
GL14 0.0555″– 0.0787″   (1.400 – 2.000mm) 6 mils
GL12 0.0661″– 0.0937″   (1.700 – 2.360mm) 6+ mils
GL10 0.0787″– 0.111″     (2.000 – 2.800mm) 6+ mils