Blast Abrasives

GMA ExtremeBlast™

Our coarsest grade for extreme jobs. Effective removal of specialized high-build coatings of 30+mils such as TSA and coal tar.

GMA ExtremeBlast™

3.5 - 4.5 mil

Surface profile

Up to 260 ft2/hr

Blasting rate

As low as 2 lb/ft2

Consumption rate

GMA ExtremeBlast™

GMA's ExtremeBlast is our coarsest garnet grade engineered for the most resilient coating removal jobs. The unique blend of both alluvial and hard rock garnet is ideal for industrial maintenance in refineries, shipyards and offshore platforms.

Our angular hard rock garnet removes resilient industrial coatings, and the durability of our sub-angular alluvial garnet helps sweep off remaining surface contaminants.

Industry Applications

Oil & gas (onshore and offshore)
Tank exteriors and liners
Water and wastewater treatment
Energy generation
Shipyard maintenance and repair
Water towers

Proven performance in surface preparation


High productivity

Cut blasting hours by 30-50% compared to slag abrasives. GMA ExtremeBlast™ performance has been demonstrated through rigorous product testing and a track record of success in applications worldwide.


Cost-effective blasting

Deliver fast results at the lowest cost. GMA Garnet™ can provide significant savings in abrasive consumption, blasting hours, and disposal costs for your project. Overall, garnet sandblasting generally requires 30–50% less product than waste slag.


Ideal surface finish

GMA ExtremeBlast™ achieves an exceptionally clean surface and high peak density. Our uniquely hard and tough garnet blend cuts through resilient coatings, allowing operators to prepare surfaces quickly for inspection and recoating.


Safe and compliant

Have complete peace of mind knowing GMA Garnet™ meets all industry, government safety, and environmental standards. Blasting the purest, cleanest garnet means less dust, leading to better operator visibility and less worker risk.


Why engineered blends perform better

GMA’s sharp, angular hard rock garnet cuts through the toughest, thickest coatings up to and above 30 mil and creates a consistent surface profile up to 4.5 mil. With the addition of fine, subangular alluvial garnet, ExtremeBlast™ removes all traces of surface embedment and contaminants. 

This dual-action performance ensures speed and efficiency on the toughest coating removal jobs and improves blasting production rates.

Blast cost calculator

How much money can the right abrasive save you?

When estimating your abrasive blasting project costs, the abrasive price won’t tell the whole story.

Forecast your profitability with an abrasive cost comparison based on independent third-party analysis. Simply provide project costs and specs, then select a GMA abrasive and an alternative

Contact GMA

Speak to an expert about GMA ExtremeBlast™

Request a product sample or onsite demo, or find your nearest GMA distributor.