HVAF High Velocity Air Fuel Surface Grit Blasting Coating Application Applied Coating
M2™ Handheld HVAF Spray Gun

The M2™ Handheld is a single nozzle HVAF spray gun for cost-effective deposition of high quality metal, metal alloy and cemented carbide coatings. The M2™ can apply all HVOF powders, as well as special HVAF cuts (-30+5 μm, -30+10 μm), and superfine cuts (-15+5 μm, -10+5 μm). Cemented carbides can also be effectively applied.

The M2™ Handheld provides a selection of low thrust nozzles that permit manual spraying, and is also lightweight at only 1.9 kg. A built-in remote control option on the spray gun provides the operator with a fast and easy access to jet and powder controls.

PowderCutVelocityD.E.Spray Rate
Metal Alloys-45+15 μm~ 600 m/s65-85%16 kg/h max
Copper-45+15 μm~ 600 m/s65-85%16 kg/h max
Aluminum-75+35 μm~ 750 m/s80-85%10 kg/h max
WC-based powders-30+5 μm~ 650 m/s50-55%20 kg/h max
CrC-based powders-25+5 μm~ 720 m/s50-58%14 kg/h max
Data obtained on Propylene 
  • WC-based coatings with hardness of up to 1200 HV300
  • Coating porosity typically below 1%
  • Compressive residual stresses in coatings
  • Negligible oxide content in coatings (1.5-2 times that of feed stock material)
The M2™ Handeld can apply copper coatings that approach the quality of CGS, at only a fraction of the cost of application. Aluminum coatings applied with M2™ have low porosity and low oxide content.

The M2™ Handheld spray gun operates on Propylene or Propane, but also fully supports the use of natural gas, offering flexibility and the option of substantial cost savings while retaining good deposition efficiency. Highly efficient 100% air cooling eliminates the need for a chilled water supply.

The cost of coating application with M2™ is 4-6 times lower compared to HVOF process due to use of air instead of oxygen and high spray rates that reduce spraying time.
M2™ Handheld Spray Gun
Fuel TypesAir ConsumptionCooling
Propylene, Propane
Natural Gas
170 SCFM @ 125 PSI100% air cooled
  • Handheld or robot mounted spraying
  • Cost-effective spraying of metals, metal alloys and cemented carbides
  • Axial powder injection
  • 100% Air Cooling (no water chillers)
  • Can spray continously for hours without stopping
  • Low operating cost
  • Low consumption of spare parts
  • Fast start-up
Grit Blasting
The M2™ spray gun can also be used to grit blast parts immediately prior to coating application. By supplying grit to the gun and executing the normal spraying sequence on the robot a part can be grit blasted in place. Hot grit blasting may also be similarly perfomed, by supplying grit to a running gun. This high velocity grit blasting offers 20-50 fold reduction in grit consumption, and up to 15 fold reduction in blasting time. For example, a mandrel that normally takes 30 minutes to grit blast, can be hot grit blasted in just under 2 minutes. Hot grit blasting technology permits to substantially increase the bond strength of subsequently applied coatings. Grit options include Aluminum Oxide # 120, 150, 180 or 220, as well as Tungsten Carbide 8-14 µm, 14-26 µm, 26-32 µm.

M2™ Coatings