“Sandblasting” is the word everyone uses, but the media coming out of the nozzle is rarely sand — and which media we pick does more to determine your result than almost anything else. It sets how fast the job goes, what the surface looks like afterward, how well the coating sticks, and what the whole thing costs. Here’s how the common options differ.
First: Why Not Actual Sand?
Silica sand fractures on impact and releases respirable crystalline silica, which causes silicosis. It’s heavily regulated for good reason, and on most commercial work it simply isn’t worth the exposure or the containment burden. Modern abrasives deliver better, more predictable results without that hazard — so the name stuck, but the sand didn’t.
Crushed Glass
Made from recycled bottle glass, with very low free silica. It cuts coatings well, leaves a bright, clean finish, and because it’s relatively light it doesn’t embed much in softer substrates. A good general-purpose choice for paint and coating removal where you don’t need an aggressive profile.
It fractures on impact, so it’s a single-use media. That keeps the up-front cost low but means more consumption and more spent material to clean up on big jobs.
Coal and Iron Slag
Slag abrasives — Black Beauty is the brand most people know — are the workhorses for heavy removal. They hit hard, strip mill scale and deep rust efficiently, and they’re economical by the ton, which matters when you’re covering a lot of square footage.
The trade-off is dust and a single-use life cycle. On outdoor structural steel and tanks that’s usually an easy call. Near occupied buildings it may push us toward dustless blasting to keep the particulate down.
Garnet
A naturally hard mineral abrasive that cuts fast while producing noticeably less dust than slag. It can often be recovered and reused several times, which changes the math on contained jobs or shop work where we can capture it.
Garnet costs more per pound. It earns that back on jobs where dust control matters, where a precise profile is specified, or where recycling the media offsets the price.
Steel Shot and Steel Grit
These are the production media, used in shot blasting where the abrasive is recovered and recycled through the machine many times over. The distinction between the two matters: shot is round and peens the surface clean, while grit is angular and cuts an anchor profile for coatings to grip.
Because they’re recycled through many cycles, steel media is cost-effective for repeat work on steel — batches of parts, structural members, equipment headed for coating.
The Non-Abrasive Options
Soda is water-soluble and gentle enough to strip coatings without cutting the substrate, which makes it useful on soft metals and delicate work. Dry ice goes further still: the pellets vaporize on impact, so there’s no spent media at all — the right answer for cleaning equipment in place or working around electrical and production machinery.
Neither creates a surface profile, so if the surface is getting coated afterward, they’re cleaning tools rather than prep tools.
Media at a Glance
| Media | Best for | Aggressiveness | Dust | Reusable |
|---|---|---|---|---|
| Crushed glass | General paint & coating removal | Medium–high | Moderate | No |
| Coal / iron slag | Heavy rust, mill scale, structural steel | High | High | No |
| Garnet | Precision work, dust-sensitive sites | Medium–high | Low | Often |
| Steel shot | Production cleaning and peening | High | Contained | Yes, many cycles |
| Steel grit | Anchor profile for coatings | High | Contained | Yes, many cycles |
| Soda | Soft metals, delicate substrates | Low | Low | No |
| Dry ice | In-place cleaning, no media residue | Low–medium | Minimal | N/A — sublimates |
What Actually Decides It
Four things, in roughly this order: the substrate (steel tolerates far more than aluminum, brick, or thin sheet), what’s coming off (one coat of paint versus mill scale and deep pitting), what happens next (a surface getting coated needs a specific profile; one just being cleaned doesn’t), and the site (containment, recovery, and dust limits can rule out otherwise-ideal media).
That’s why we don’t quote off a price list. The same square footage can call for completely different media and a different price depending on those four answers.
We Sell Media Too
If you run your own blast equipment, we stock abrasive media and can advise on what fits your application — see abrasive sales for what we carry. And if you’d rather hand the whole job off, request a free quote or call (404) 220-7803 and we’ll tell you what we’d run and why.