How does blast media work?
During the blasting process, a stream of (abrasive) granules is blown under high pressure onto the workpiece. These grains treat the surface deep into the pores. The abrasive hits the surface/component for processing. It can be used for multiple applications such as cleaning, shot peening, paint removal, rust removal, roughening, matting, stripping and polishing.
Which blasting abrasive should I use?
Which abrasive to use depends on many factors, among others:
- Which blasting principle is used? Brown aluminium oxide cannot be used in, for example, a wheel blasting machine.
- What material is blasted? Not every material can withstand certain types of abrasive.
- What is the desired roughness (Ra, Rz or Rt-value)?
- What is the desired speed?
In the following paragraph, you will find the different types of abrasives and how they are applied. If you would like to receive personal advice on which blast abrasive to use, you can always contact us.
What kinds of blast media are there and what are the differences?
- Steel grit
- Steel grit is an aggressive metallic abrasive (high carbon). It can be used in blasting machines, blasting rooms or mobile blasting solutions for sheet metal, profile and structural steel.
- Application: clean blasting, rust removal, roughening and matting.
- Steel shot HC
- Steel shot HC (High Carbon) is a round metallic abrasive that is mainly used in blasting installations and blast halls.
- Application: de-rusting and stripping of sheet metal, profile and structural steel.
- Steel shot LC
- Steel shot LC (Low Carbon) is a round metallic abrasive. It is mainly used in blasting installations and blast rooms.
- Application: clean blasting and de-sanding.
- Durablast / cut wire abrasive
- Durablast is a metallic abrasive. Durablast is produced by cutting spring steel to the desired grain length, produced following DIN 8201. Durablast is mainly used in (larger) blasting installations and cabins.
- Application: cleaning, roughing and shot peening (rounding).
- Ferblast / chilled iron grit
- High-quality angular cast iron grit produced according to ISO 11124-2, melted in drum furnace.
- Application: Clean blasting, roughening, rust removal, stripping, filler for concrete production.
- Stainless steel shot – Amacast
- A high quality austenitic stainless steel shot, by applying a unique technological process there is less contamination.
- Application: Clean blasting, roughening (especially in the food industry) and shot peening
- White aluminium oxide
- The (white) aluminium oxide of Normfinish is of 1A quality, with an iron-free quality.
- Application: Wet and dry blasting, polishing
- Glass bead blast media
- Glass bead is a non-metallic abrasive. It is widely used to clean, polish, mattify stainless steel and aluminium and to reduce surface roughness.
- Application: Cleaning, polishing, matting, Reducing surface roughness, shot-peening (according to specification) and suitable for blasting on stainless steel products
- Brown Aluminum Oxide, premier quality
- Brown Aluminum Oxide, premier quality is a non-metallic abrasive (95%). It is used in blasting booths, blasting halls and for mobile blasting. It is not suitable for abrasive blasting installations.
- Application: clean blasting, roughening, removal of paint layers, blasting and use as anti-slip material.
- Brown Aluminum Oxide, standard quality
- The difference is in the alumina content (AlOx) – 88-89%. Brown aluminium oxide, second quality is a non-metallic abrasive. It is used in blasting booths, blasting halls and for mobile blasting. It is not suitable for blasting installations.
- Application: cleaning, stripping, de-rusting and roughening.
- Stainless steel shot – Amacast
- Amacast is a non-metallic abrasive. A high-quality chrome steel shot.
- Application: clean blasting, roughening especially of stainless steel, aluminium and zinc products.
- Stainless steel grit – Amagrit
- Amagrit is a rust-resistant and angular stainless steel grit. Amagrit is available in various grain sizes, packed in sturdy PE bags of 25 kg, 500 kg on a one-way pallet with a protective cardboard and shrink sleeve. Amagrit is also easy to mix with stainless steel shot for thorough cleaning of the surface.
- Application: Amagrit is often used for: Cleaning, deburring, roughening, fine blasting, but can also be used for water cutting. Commonly used for blasting stainless steel, aluminium, zinc and in the stone industry.
- Ceramic bead blast media
- Ceramic bead blast media are a non-metallic abrasive. Ceramic beads are also used to give a nice finish to stainless steel surfaces.
- Application: Ceramic beads for cleaning and shot peening of e.g. rotors, turbine blades, shapes and moulds.
- Plastic blast media
- Plastic abrasives are used for stripping surfaces. Due to the sharp-edged surfaces, a product can be carefully cleaned, stripped or stripped of sharp edges.
- Walnut shells
- Ground walnut shells (crushed nut shells), dried, degreased and classified.
- Application: usage in which the surface structure must not be affected, e.g. in the following industries:
- Petrochemical (cleaning of e.g. turbines)
- Automotive and aviation
- Rubber and plastic industry (cleaning of e.g. moulds)
- Vasil grit / Melting slag
- Vasilgrit is a sharp-edged, aluminium silicate abrasive made from melting slag, a by-product of coal-fired power plants, colour brown-black.
- Application: blasting metals, stone and concrete, to remove mill scale, rust and old paint layers.
- Garnet is a highly abrasive and non-metallic abrasive for multiple uses. Garnet is normally used in blasting cabinets, blasting rooms and in mobile blasting solutions.
- Application: surface coarsening, rust removal and stripping. This abrasive is also widely used in the process of water cutting.
Advice from Normfinish
Would you like personal advice on which abrasive to use? Please contact one of our specialists. We will be happy to help you!