What makes our garnet unique?
GMA’s garnet is different from other abrasives and garnet suppliers, making it ideal for abrasive blasting and waterjet cutting applications.
What makes our garnet unique?
GMA’s garnet is different from other abrasives and garnet suppliers, making it ideal for abrasive blasting and waterjet cutting applications.
Blending innovation with nature’s work
For 40 years, GMA has produced the highest-quality almandine garnet abrasives for the global abrasive blasting and waterjet cutting industries globally.
Almandine is the hardest, toughest, densest form of garnet, and GMA products are derived from some of the oldest known almandine garnet deposits in the world.
These deposits have concentrated their natural characteristics over time. This unique geological history combined with our drive for innovation and unique processing methods result in extremely effective and efficient abrasives.
An extensive alluvial history
Our garnet’s prolonged exposure to nature’s forces has resulted in the toughest, most resilient sub-angular garnet grains.
Early garnet formation
Our garnet has evolved over millions of years. Tectonic plate collision, and the high pressures and temperatures accompanying it formed igneous and metamorphic rock. Garnet is created as a by-product of this process.
Rich ancient garnet deposits
Hundreds of millions of years of weathering and erosion freed garnet from the rock formations. Over millions more years, the released garnet washed into floodplains, then offshore, and finally deposited on the shores of Western Australia and South Africa.
The toughest garnet grains
Nature's forces have whittled down the garnet, resulting in tougher, more resilient sub-angular garnet grains without fractures or composites with other minerals.
This makes our garnet ideal to withstand the forces required for effective abrasive blasting and waterjet cutting.
The GMA advantage
Hardness
The harder the abrasive, the better it cuts. GMA’s garnet is of the almandine variety — the hardest form of garnet. Our garnet grains are up to 30% harder than other garnets and nearly 300% harder than coal slag, giving it a higher relative resistance for abrading a surface, and resulting in faster blast rates and higher cutting speeds.
Toughness
Our garnet is less friable, meaning it does not fracture or shatter upon impact when blasting or cutting. GMA Garnet is up to 100% tougher than other garnets, and up to 500% tougher than coal slag.
This toughness means it produces less dust in abrasive blasting and waterjet cutting, leaves more recoverable and recyclable abrasive after use, and produces better edge quality in waterjet cutting.
Density
A heavier, denser abrasive grain delivers more kinetic energy to abrade or cut a material. GMA Garnet is up to 20% denser than other garnets, and 60% denser than coal slag.
This produces a deeper, more consistent anchor profile in abrasive blasting, and it achieves a consistent flow and cutting speed at every stage of the waterjet cutting process.
Angularity
The angularity of the abrasive grain affects the cut speed and quality, as well as the consistency of the surface. GMA Garnet is subangular, the ideal particle shape to achieve high production rates, high surface quality, and minimal dust, fracturing, or embedment on impact.
A sharp, highly angular grain will cut quickly but leave an inconsistent surface, and have a higher risk of shattering on impact or embedding into the surface. A rounded grain will create a consistent surface but at much lower productivity, requiring more abrasive to complete the task (or in some cases, not being able to complete the task to specification).
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How is GMA Garnet™ different to other abrasives?
GMA Garnet™
- Solid almandine garnet particles from prolonged natural attrition
- Very resistant to further breakdown
- Inert, natural mineral with minimal to no worker or environmental risks.
Indian Garnet
- Inherently weaker due to relatively short sedimentary life
- Characterized by more fracture planes
- May be prone to higher breakdown in use producing higher dust levels
Chinese Garnet
- Inconsistent or variable quality from batch to batch.
- Poor abrasive characteristics due to a clustered crystal structure, or composites with other minerals
- Highly friable and breaks easily, increasing dust levels
Typical Slag
- Fractured structure
- Highly friable, producing high dust levels
- Has sharp, horn-like structures that can embed into the surfacec
- Contains heavy metals & other harmful substances
- High consumption due to abrasive grain breakdown
Discover the GMA Garnet™ range
Find the right garnet abrasive for your project to maximize performance and minimize risk.
Blast abrasives range
Engineered to perform, GMA's blast abrasives range cut and clean faster, delivering optimal performance for any surface preparation job.
Explore productsWaterjet garnet range
Confidence in every cut. GMA's waterjet garnet is recognized as the industry standard among manufacturers and operators of waterjet cutting machinery.
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