Sand as sandblasting media
Like all equipments and media for that equipment, sandlbastinga lso has more that just one variaty of it.
Even in old times, when only sand was being used, they had different types of it. Difference in sand was the size of grain, smaller one was more sharp and had better effect if you want to strip paind form surface, while bigger grains were mainly used for cleaning of surface.
Because of all health related issues and because new materials were invented, sand is more or less not used at all lately.
Nowadays new materials have replaced sand. We can roughly say we know two types of media, abrasive blasting for stripping of paint and tumbpling which is aminly used for polishing and cleaning of surface. And that is not all, then we have many different types of both tumbling and abrasive media. All these are available to give you best possible option for sandblasting you want to do.