Views: 200 Author: SEPPE Garnet Team Publish Time: 2026-08-05 Origin: SGA Blasting
The lowest bag price does not always produce the lowest blasting cost. The better choice depends first on the equipment and whether spent abrasive can be recovered. The required surface profile then narrows the options further.
Garnet and aluminum oxide can both prepare metal effectively, but they behave differently in service. Silica sand needs an additional safety review because blasting can release respirable crystalline silica.
A closed cabinet can capture, clean and return usable abrasive. In that environment, the higher purchase price of aluminum oxide may be offset by repeated recovery. The economics change in open blasting, where much of the media cannot be collected. A garnet grade selected for the required profile may then be the more practical option.
This is not a fixed rule. Recovery efficiency varies, and reused media changes as it breaks down. Before comparing quotations, confirm how the system separates dust and whether the recovered blend remains suitable for the job.
Aluminum oxide is harder and is often chosen when aggressive cutting and repeated reuse are priorities. Garnet is less hard, but a clean and correctly sized grade can provide controlled cutting action in open blasting. Hardness alone does not determine the result. Grain size and air pressure can change the profile as much as the mineral name on the bag.
SEM images show particle shape at the stated magnification. They do not by themselves establish blasting speed, dust generation or nozzle life.
Quartz is a form of crystalline silica. When silica sand fractures during blasting, respirable particles may enter the air. This is an occupational health issue rather than a simple comparison of hardness or purchase price. Applicable regulations and the site exposure-control plan must be checked before silica-containing media are considered.
Changing the abrasive does not remove every dust source. Old paint and corrosion products also become airborne during surface preparation. Any substitute still requires suitable containment, ventilation and personal protection.
In a recycling cabinet, media life may carry more weight than the initial price. On an open site, the cleaning rate and the amount of abrasive used become more important because recovery is limited. Cleanup and rework can also change the final cost, but they must be measured under the same operating conditions.
Illustrative comparison for single-use open blasting. The bars are not measured project data; actual cost depends on the equipment, surface condition and operating method.
| Operating situation | Starting point | What to verify |
|---|---|---|
| Closed system with effective recovery | Aluminum oxide may suit repeated reuse | Breakdown rate and recovered-media condition |
| Open blasting with limited recovery | Garnet may offer a practical balance | Cleaning rate, consumption and required profile |
| Stainless steel or contamination-sensitive work | Use an approved dedicated medium | Equipment cleanliness and project requirements |
| Silica sand under consideration | Complete the safety review first | Local rules and exposure controls |
Illustrative comparison of a closed recovery system and open blasting where abrasive recovery is limited.
Run a controlled test on a representative surface before changing media. Keep the equipment and nozzle technique unchanged. Record the area cleaned and the abrasive used, then inspect the resulting profile. This shows whether a higher bag price is offset by production performance on the actual job.
For stainless steel, the test must also address iron contamination and equipment cleanliness. No abrasive should be described as automatically safe for every stainless-steel project.
Technical reference
NIOSH — Preventing Silicosis and Deaths From Sandblasting
For grade information or a controlled sample comparison, contact SEPPE with the blasting system and required surface result.
