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W E T A B R A S I V E B L A S T I N G
CHOOSING A BLASTING NOZZLE: 4 THINGS TO CONSIDER
1 I THE AIR COMPRESSOR
2 I THE NOZZLE SIZE
3 I THE NOZZLE SHAPE
4 I THE NOZZLE MATERIAL
The more air volume you can compress per minute, the higher the pressure produced at the nozzle. A rotary compressor compresses the
air twice to increase the pressure.
To find your optimally productive nozzle, determine what nozzle pressure (PSI) you need to maintain for productive blasting, and what
volume of air your compressor can supply per minute (CFM).
Harder materials will be more resistant to wear, but are more expensive to replace and are prone to cracking under rough handling.
Atmospheric pressure
High pressure
Extremely high pressure
1
2
3
1
2
3
50 PSI3,4 BAR
60 PSI4,1 BAR
70 PSI4,8 BAR
80 PSI5,5 BAR
90 PSI6,2 BAR
100 PSI6,9 BAR
125 PSI8,6 BAR
110 124 145 160 175 200 275
150 170 200 215 240 255 315
200 225 250 275 300 340 430
300 350 400 450 500 550 700
430 500 575 650 700 800 1100
#6 (3/8» / 9.5 MM)
#7 (7/16» / 11 MM)
#8 (1/2» / 12.7 MM)
#9 (5/8» / 16 MM)
#10 (3/4» / 19 MM)
MINIMUM CFM REQUIRED
Durability
Impact Resistance
Price
Tungsten
Carbide
Durability
Impact Resistance
Price
Silicon
Carbide
Durability
Impact Resistance
Price
Boron
Carbide
Durability
Impact Resistance
Price
Composite
Carbide
www.blastjournal.com I www.graco.com
Nozzles come in two basic shapes: straight
bore and Venturi. Venturi nozzles are designed to
produce an effect which greatly accelerates the air flow
and particles.
Straight Bore
Blast Pattern: XXX
Production Rate: XXX
Long Venturi
Blast Pattern: 3” at 18” distance
Production Rate: 4.5/5
Double Venturi
Blast Pattern: 3” at 18” distance
Production Rate: 4/5
Wide Throat
Blast Pattern: 3” at 18” distance
Production Rate: 5/5
XL Performance
Blast Pattern: 5” at 48” distance
Production Rate: 3/5
The least
durable, but
cheap
Like tungsten
carbide, but
lighter
Extremely hard
and durable, but
brittle
Even harder
than boron
carbide
