Which blasting media is NOT mentioned as a choice for cleaning aluminum alloys?

The correct choice indicates that sand is not mentioned as a suitable blasting media for cleaning aluminum alloys. In the context of surface preparation for aluminum, it is important to select an appropriate blasting media that will avoid damage to the material. Aluminum oxide and garnet are often specified because they are harder and provide an effective cleaning action without compromising the integrity of the aluminum surface. Sand, on the other hand, can be too abrasive, leading to an undesired surface profile and potential contamination. Additionally, the use of silica sand can pose health risks due to silica dust. Therefore, it is not recommended for cleaning aluminum alloys in many applications and is commonly excluded in guidelines governing surface preparation standards for these materials.