3. Abrasive
Whereas the type of the abrasive used to follow clearly from the term “sand blasting”, nowadays difference has to be made between different kinds of abrasives. The silica sand that was used in former times can be applied now only with special permit due to the risk of silicosis; these special permits have to be applied for at the competent authorities. Silicosis is a disease (also called black lung) caused by finest silica sand entering the lung and there it clogs the air sacs.
By using the blasting method various kinds of work can be performed now. The number of abrasives that can be adjusted to the respective purpose of work is therefore high. There is no universal abrasive. The selection of the respective grain sizes is decisive besides the selection of the abrasive. Bigger particles transfer higher kinetic energy and are thus well suited to e.g. break open thick layers. Quicker and steadier cleaning results are, however, obtained by a big number of smaller particles.
Slag, corundum, steel shot and glass have proven to be suitable apart from some very special abrasives.
- Table of contents
- 1. Fields of application of abrasive blasting technology
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2. Blasting technology
- 2.1 Airless blast cleaning
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2.2 Injection blasting
- 2.2.1 Compressed air blasting (also air blast cleaning or sand blasting)
- 2.2.2 Pressure blasting (injector blasting)
- 2.2.3 Vacuum-compressed-air blasting and vacuum injection blasting
- 2.2.4 Damp blasting
- 2.2.5 Wet blasting
- 2.2.6 Slurry blasting
- 2.2.7 Ice Blasting
- 2.2.8 Water- jetting cleaning and hydro-jetting
- 2.2.9 Wet blasting for fine surface treatment
- 2.2.10 Combination of different blasting methods
- 2.3 Laser cleaning
- 3. Abrasive
- 4. Efficiency assessment of abrasive blasting
- 5. Influence of compressed-air blasting on the surface of the workpiece
- 6. Generation of compressed air
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7. Plants for compressed-air blasting
- 7.1 Small and medium-sized blasting pots
- 7.2 Large blasting pots
- 7.3 Double-chamber blasting pot
- 7.4 Mixing and dosing valve
- 7.5 Hoses, lengths of hoses, couplings
- 7.6 Selection of a blasting pot in considering the wear and tear behaviour
- 7.7 Increased wear and tear at the blasting pot caused by wrong adjustment
- 8. Remote control and emergency shut-downs
- 9. Jet nozzles
- 10. Stationary blasting halls
- 11. Mobile abrasive blasting equipment
- 12. Laws and provisions