Blast materials

Sandblasting: the areas of use

The sandblasting procedures can be divided into the following major groups:

  • Deoxidizing sanding (derusting) for metal structures (bridges, iron structures of buildings, tanks, pipes, etc.). Surface preparation to remove rust before the protective coating is applied.
  • Scaling: removal of scale from semi-finished products produced with machining, such as disks, tapes, wires, pipes, forged and heat-treated parts.
  • Cleaning: Cleaning of casts (cleaning the casts from the mould’s sand and scale), preparation and cleaning of soldering and welding spots, cleaning of welds, removal of old paint and other coatings.
  • Sanding for surface finishing.
  • Roughening: various metallic or non-metallic coatings (sprayed metal, rubber, etc.). Increasing their bonding strength.
  • Fine sanding: elimination of the roughness of previously fine-treated surfaces – caused by use
  • Finishing sanding: elimination of the roughness and scratches of the machined surfaces
  • Matting: meeting the needs for decoration, as well as eliminating glare from the parts of optical devices

Grits used for sandblasting

The effectiveness of cleaning is determined by the number of particles per unit area at a given moment, their impact speed and mass, as well as their edges.
Based on the composition, two groups of materials can be distinguished:

  • man-made blast materials;
  • blast materials of natural origin.

The artificial grits include:

  • metal grits,
  • noble and standard corundum particles,
  • silicon carbide,
  • glass pearls and glass chips,
  • slag,
  • blast materials from organic (cut plastic) and artificially produced inorganic materials.

The materials of natural origin include:

  • Quartz sand;
  • Basalt chippings;
  • Sand;
  • Ground stones of fruits.

The blast material can have the following shapes:

  • Round,
  • Pellet-shaped,
  • Angular,
  • Cylindrical,
  • Rounded,
  • Concave,
  • Column.

Based on its hardness, the material can be:

  • Hard,
  • Soft.

The most commonly used scale is the Mohs hardness scale to specify hardness. It is based on the so-called connection hardness that shows which mineral scratches the other.

Degree of hardness: Mineral’s name: Composition:
1 talc


2 gypsum


3 calcite


4 fluorite


5 apatite


6 feldspar


7 quartz


8 topaz


9 corundum


10 diamond



Corundum is a blast material produced from aluminium oxide. It has excellent hardness and the edges are renewed during the sanding process. There is standard corundum and inert corundum. 20-96% of the standard corundum is blast material with aluminium oxide content; this number is 98% for the inert corundum. The inert corundum can be used for cleaning stainless steel, for glass matting, stone grinding, and for cleaning of wood, plastic, hard metal, etc. The inert corundum particle can be used for sanding equipment using turbine and compressed air; for sanding cabin processes as well as for free-jet surface treatment or for closed cyclical process provided by a vacuum unit. The electro corundum particle used for sanding does not contain any free silica and therefore it does not cause silicosis. The particles, due to the melting production technology, are monocrystals of homogeneous structure, and have identical shape due to the special milling and grinding techniques.

1. Aluminium oxide particles (Corundum):

White, neutral pH, insoluble in water, does not contain any heavy metals or toxic substances.

  • Hardness: MOHS 9
  • It's crystal have extremely favourable cutting edges
  • Cycle time: 6-8 times
  • Packaging: in 25 and 50 Kg bags

Corundum particle size

FEPA Size μ Article number Use
R 12 1400-2000 100112 Aggressive cleaning effect.
For example: cleaning operations in foundries, rust and scale removal
R 20 850-1400 100120  
R 30 500-850 100130  
R 40 355-600 100140  
R 54 250-420 100154 Rust, scale or paint removal, roughening,
preparation of painting
R 60 200-350 100160  
P 80 149-210 100180  
P 100 105-149 1001100  
P 120 88-125 1001120 Tool cleaning, matting
P 150 63-125 1001150  
P 220 53-88 1001220  

2. Glass particles:

Universal blast material from the recycling of glass. Greenish grey, PH neutral, insoluble in water, does not contain any heavy metals or toxic substances./p>

  • Hardness: MOHS 6
  • Shape: rectangular
  • Cycle time: 3-4 times
  • Packaging: in 25 and 40 Kg bags
Particle size Article number Use
0,10 - 0,20 mm 10022 Fine cleaning of precision tools
0,20 - 0,50 mm 10023 Tool cleaning, finishing, surface hardening
0,50 - 1,00 mm 10024 Matting, roughening, preparation of painting
0,50 - 2,00 mm 10025 Removing rust, scaling
1,00 - 2,00 mm 10026 Removing rust, scaling

3. Glass pearls:

Micro glass pearls. White, neutral pH, insoluble in water, does not contain any heavy metals or toxic substances.

  • Hardness: MOHS 6
  • Shape: round
  • Cycle time: 4-5 times
  • Packaging: in 25 Kg bag

Glass pearls’ particle size

Number of particles Size μ Article number Use
Nr.1 0-50 10031 Precision tool’s refining, polishing
Nr.2 40-70 10032  
Nr.3 70-110 10033  
Nr.4 90-150 10034 Tool cleaning, finishing, surface hardening, preparation of painting
Nr.5 100-200 10035  
Nr.6 150-250 10036  
Nr.7 200-300 10037  
Nr.8 300-400 10038 Surface cleaning, matting
Nr.9 400-600 10039  
Nr.10 600-800 10040  

4. Sharp steel grits:

Sharp steel grits.

  • Cleaning of surfaces (scaling, rust removal, cleaning)
  • Preparation for enamelling, painting and coating
  • Rough sanding and matting

GP: Becomes round during work, breaks into spherical segments during fatigue fracture.

GL: The edges become round during work, break into sharp pieces of debris during fatigue fracture.

GH: It remains sharp during work, breaks into sharp pieces of debris during fatigue fracture.

Chemical composition [average]

C 0,85-1,20 %
Mn 0,35-1,20 %
Si 0,40-1,50 %
S Max. 0,05 %
P Max. 0,05 %

Technical details

Hardness GP: 40 - 50 HRC
Hardness GL: 55 - 60 HRC
Hardness GH: 64 - 68 HRC
Specific weight 7,0 g/cm3
Density kb. 3,7 g/cm3

Sharp steel grits’ sizes:

Marking Nominal grit size
G 12 1,70 mm
G 14 1,40 mm
G 16 1,20 mm
G 18 1,00 mm
G 25 0,80 mm
G 40 0,60 mm
G 50 0,30 mm
G 80 0,20 mm
G 120 0,10 mm
SA Blast 0,20-0,060 mm

Glass pearls

Nr.1 0-50µ
Nr.2 40-70µ
Nr.3 70-110µ
Nr.4 90-150µ
Nr.5 100-200µ
Nr.6 150-250µ
Nr.7 200-300µ
Nr.8 300-400µ
Nr.9 400-600µ
Nr.10 600-800µ

Electro corundum

-P20 850-1400µ
P30 500-850µ
P40 355-600µ
P54 250-420µ
P60 150-250µ
-P100 100-200µ
P120 90-150µ
P150 63-125µ
P220 45-90µ

Fire-dried quartz sand
0,8-1,2 mm

Metal grits

The above details are for information only!

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