Canfield & Joseph, Inc: Foundry and Industrial Supply: GMA Garnet
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Products & Services › Abrasive Blast Media

GMA Garnet™



Downloads & Brochures:
Blast Cleaning Abrasive Fine & Super Fine Abrasives
Waterjet Cutting Abrasive Waterjet Cutting Grade TDS

GMA Garnet™ blast cleaning abrasives are well suited to most fields of surface preparation industry, with or without subsequent coatings in particular:

  • Bridge and weir lock.
  • Building and structural steel.
  • Construction and maintenance of chemical plants, nuclear and fossil power stations, gas and sewerage plants, desalination and industrial plants.
  • Construction and maintenance of containers and tanks, tank trucks and rail tanks, wagons and coaches.
  • Non-ferrous surfaces and turbine blades (special mesh).
  • Oil and petrochemical maintenance in refineries and storage tanks including on-shore and off-shore installations.
  • Shipyards, new building, conversion and repair including antimagnetic and other special steels as well as aluminium super structures and aluminium and fibreglass hulls.
  • Stainless Steel.
  • Stone building facades and monuments.

GMA Garnet™ provides optimum blasting efficiency and economy if correctly applied. Here are some guidelines:

  • Ensure the nozzle air pressure is 95-100psi (measured at the nozzle). Note: for every 1psi under 100psi, efficiency is reduced by 1.5%, i.e. at 70psi you are blasting at 55% efficiency. 
  • Check nozzle pressure frequently with a hypodermic needle gauge
  • Check nozzle frequently for wear and replace when worn to ensure optimum productivity is maintained.
  • Check all blast pot fittings, hoses and hose couplings, both air and air/abrasive and repair anything that are faulty immediately. Any air leak will cause a loss in pressure at the nozzle.
  • Use an efficient moisture removal system to prevent pressure drop.
  • Use an efficient moisture removal system to prevent pressure drop.
  • Fit an abrasive valve that can accurately meter the abrasive flow to ensure correct air/abrasive mix in the blast hose as accurate abrasive metering is very important.
  • Ensure all blast pots are supplied by an air hose that has a minimum id of 40mm (1 1/2") preferably 50mm (2"). This hose must be fitted with non-restrictive coupling fittings.
  • The air piping on your blast pot must be a minimum of 32mm id (1 1/4"). Be sure that full port ball valves are used on the choke valve. Do not use reduced port valves anywhere in the system as a pressure drop will occur because of restricted air flow through the ball valve.


Cuts fast and reduces abrasive consumption—Less abrasive means lower disposal cost—Environmentally friendly - no heavy metals—Low dusting - better visibility while blasting—Recyclable


  • Size 16 (Extra Coarse): removes very thick coatings (50-60+ mils) and rust. Can obtain a 4+ mil profile on steel.
  • Size 36 (Coarse): removes thick coatings (20-50 mils). Typical mil profile between 3.5 - 4.5 on steel.
  • Size 30/40 (Medium Coarse): removes heavy coatings and rust (20-40+ mils) while maintaining a consistent profile, typically ranging from 2.5 - 3.0 on steel surfaces.
  • Size 30/60 (Medium): very common grade used for new steel and various types of maintenance work on coatings (ranging up to 20 mils) resulting in a typical profile between 2.0 - 2.5 on steel surfaces.
  • Size 80 (Fine): typically used on more sensitive surfaces, typically produces a 1.5 - 2.0 mil profile on steel surfaces.


Available in:

  • BAGS 55/100lb
  • BULK BAGS 2000/4000lbs
  • Bulk Per ton

GMA Garnet


Comments or questions? Email Us.
For immediate assistance or to place an order, call your closest location.
Ft. Worth Houston Kansas City St. Louis Tulsa
(800) 480-8957 (877) 905-0526 (800) 933-3643 (800) 513-9857 (800) 364-5452
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