Garnet (Natural Mineral Abrasive)

Garnet (Natural Mineral Abrasive)

Microblast® is a natural mineral abrasive, reddish/pink in colour, predominantly almandite consisting of sub-angular particles mined from an alluvial resource.

Product Features




Microblast® is the abrasive of choice for all water jet cutting and abrasive blasting applications. It is also used as an alternative to aluminium oxide for general cleaning, deburring and decorative finishing. Its unusually attractive colour lends itself to decorative and architectural uses as well.


  • Hardness: 7.8 – 8 Moh scale
  • Specific weight: Approx. 4.1 g/cm³
  • Bulk weight: Approx. 2.3 kg / L
  • Free silica: < 1 %
  • Chlorides: < 30 ppm
  • Conductivity: < 25mS/m ISO 11127
  • Storage: Dry, sheltered storage conditions
  • Packaging: 2T bulk bags or unitized 25kg bags


  • SiO2: 33%
  • Fe2O3: 33%
  • TiO: 1%
  • AI2O3: 23%
  • CaO: 4 %
  • MgO: 4%
  • MnO2: 1%


Waterjet cutting grade:
  • Range: W80, Size: 150 – 425 microns
  • Range: W120, Size: 125 – 300 microns
Blasting grade:
  • Grade: 20/60, Size range: 250 – 850 microns
  • Grade: 30/60, Size range: 250 – 600 microns
  • Grade: 20/40, Size range: 425 – 850 microns


  • Produces a rough, uniform, matte finish with a sharp texture.
  • The grain shape and high bulk density result in a fast cutting and stripping abrasive.
  • May be disposed of in non-hazardous waste dumping sites unless contaminated with other hazardous materials.
  • Can be recycled up to five times without loss of performance, resulting in lower shipping, handling, collection and disposal costs.
  • Blast cleaning using garnet produces significantly lower dust emissions than other blast abrasives – resulting in minimal disruption and danger to adjoining operations, improved operator visibility, and lower cleanup costs.
Blastrite is a leading manufacturer and distributor of granular abrasives. Blastrite has two mineral processing facilities in South Africa as well as sales and distribution infrastructure throughout Africa, the Middle East, SE Asia, the USA and Europe, all of which supply the petrochemical, shipping, construction and mining industries with internationally approved and certified loose abrasives.

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