Garnet Abrasive Media

Arguably the most cost effective abrasive to use in 85% of the blasting projects in the world.

Garnet Blasting Media is now fast becoming the abrasive of choice for professional blasting contractors. Contractors who use Garnet correctly, and use the right type of Garnet , are smashing their competitors, project after project.
Here’s why they are winning:

  • Garnet Blasting Media is very low dusting. This is the principle reason why most contractors use Garnet.  Blast-One Garnet is between 7.5-8.0 on the MOH Hardness Scale – this means that less particles breakdown on impact
  • Garnet is an Environmentally Responsible alternative to Slags – it does not contain lead, beryllium and other toxic substances found in slag
  • Garnet keeps the workers safe – if you are using Slag or Silica Sand you are exposing your workers to many dangers. Silica Sand is a #1 carcinogenic which causes Silicosis (cancer of the lungs). Ever seen someone with Silicosis? If you have, you will never ever allow the use of Silica Sand again – it destroys people’s lives entirely.
  • Garnet on average  has around half the consumption of slag
  • Half the amount of abrasive used means half the amount of abrasive to clean up and pay to dispose of.
  • Garnet achieves a white metal blast effortlessly without embedment or surface contamination.

And that is just some of the reasons why contractors chose to use Blast-One GMA Garnet.

Garnet Testimonials

Testimonial - Barkley Dam - Kentucky

Testimonial - Fairhaven Ship Yard - Seattle

GX-GMA Garnet vs. Slag Demonstration

The True Cost of Blasting

GMA Garnet vs Slag

Most Blasters readily agree that garnet is the better abrasive all round.  “We don’t have to fill the blast Machine as often; it cleans faster, has hardly any dust and gives a much cleaner job all around”. But often we hear contractors say:


“It’s just too expensive to use”

This is the perception of course, because garnet is up to 6 times the price of Slag.  In fact, the abrasive cost has very little relationship with the finished cost of the project.  Unfortunately, abrasive cost alone assumes all abrasives perform the same.
This Garnet cost comparison diagram illustrates how spending more on a high performance Blast-One Garnet Abrasive means you end up spending less on all the other costs in a project, ultimately providing a lower overall project cost.

Yes, the initial purchase price of Garnet Abrasive is more expensive than Slag…where some people fail is that they assume that the cost of the abrasive alone determines what is going to be cheapest.
This is not really a failure, but really a misconception in the industry. If you want to really want to get ahead in the blasting business, you have to overcome this misconception.
On a blasting project of any significance, if you actually look at the cost of abrasive compared to the total job cost, it is extremely surprising to notice how small of a percentage the abrasive actually is of a total project.

Important Questions to consider when choosing your abrasive

  1. What will my blasting speed be with each abrasive?
  2. What will my hourly consumption be with each abrasive?
  3. What delivery to site, and disposal will be required?

Consider the following:

A chainsaw is far more expensive than an axe, however tree felling companies who want to make a profit would never consider using an axe.

A machine gun is far more expensive than a set of bows and arrows, however the military would never conceive going to war in this moden world with bows and arrows.

To assist in calculating actual blasting costs, BlastOne have developed a tool to assist in the calculate the true cost of each blasting media.


Before we go any further, it is important to understand that you won’t make more profits by just ‘using’ Garnet! As in if you read this web page, and you would like to try using GMA Garnet, if you just go and buy GMA Garnet, put it in your blast pot and start blasting you are almost guaranteed to fail!

As with most new technologies/products, success in using the product only comes from having experienced consultants assist you and train your teams.

The good news is that BlastOne Consultants spend their life doing this. With over 500 years of collective experience and knowledge gained from being involved in thousands of projects, our Project Consultants can really assist you maximize the profitability on your project when using GMA Garnet.

Surface Profile and Cleanliness

Profile Requirement

Many contractors who use coal slag are actually creating too much profile on the steel. Did you know that more coating failures have been attributed to too much profile than not enough? If you are using 20/40 coal slag, you would most likely be achieving a 4-5 mil profile.  This is causing the contractor to apply excess primer to cover this excessive profile, costing the contractor more. The below diagram explains how much paint is needed to cover profile.


Surface Cleanliness

The other advantage of using Blast-One Australian Garnet is that surface cleanliness is greatly enhanced.
Slag blasted steel surfaces inherently have slag particles embedded into the surface at around 500 particles to the square inch.  These particles are the result of the sharp slag corners breaking off on impact and impregnating into the steel profile.

Laboratory research has determined that the effect of this extraneous material is detrimental to coating performance.  We saw these imbedded particles onsite, protruding right through the paint coating.

No such embedment appears on Garnet blasted surfaces.

Worker Environmental Conditions

Dust Levels when using slag

Slag is quenched from its molten state with cold water giving each particle a brittle structure with distinct fracture lines.

Upon impact with the surface the slag particle breaks down into several pieces.  Hence the dust levels are high and the product doesn’t lend towards recycling.

Garnet is an extremely hard stone with low friability, hence a low breakdown rating allowing 10 or more times recyclability.  Garnet is very dense with a high specific gravity and any broken down particles fall out of the air immediately.

(We often notice that on slag projects the drift of spent slag and debris travels around 120 feet down wind and only around 40 feet on similar Garnet projects.)

By switching to GMA Garnet, you will notice a dramatic difference in dust levels – your workers will go home cleaner and will have much better job satisfaction!


Heavy Metal Content

Garnet as a natural stone has extremely low levels of heavy minerals.

Coal slag is a by-product of the metals refining industry and contains high levels of Toxic Heavy Metals, so much so that many authorities are banning the use of slag purely because of the hazardous nature of the toxins in the virgin slag material. Some states classify slag as a hazardous waste even before it is blasted – the new slag in the bag is hazardous waste! Please be careful when using slag.

GMA Garnet – the world’s premium Blasting Abrasive

As one of GMA Garnet’s largest garnet distributors in the world we are capable of supplying garnet abrasive media efficiently and cost effectively to your project site.

Pioneereing the use of garnet as an effective abrasive blasting media back in the 1980's, back when ‘Garnet’ was only known as a gemstone, by worked closely with the founders of Garnet Millers Australia (which is now known as GMA Garnet) to trial the use of garnet as a effective blasting media.

Now g arnet abrasive is among the most common blast media’s used in the world.

Take a project cost analysis
To find out if you could save money by using GMA Garnet, ask one of our Project Consultants to put together a project cost analysis for you.