Sand Blasting, Shot Blasting and Grit Blasting: How to Choose
The three names get used almost interchangeably, and the media they name behave nothing alike. Sand and grit are angular and cut into a surface; shot is round and peens it. The choice changes the finish, the dust, and how fast it wears the hose delivering it.
Whichever media you run, it moves through the same hose. See the full range it’s built for.
What is the difference between shot blasting and sandblasting?
Shot blasting fires round steel balls that peen a surface without cutting it; sandblasting fires angular sand or grit that cuts into the surface and removes material. Round media polishes and compresses; angular media strips and profiles. The shape of the grain, not the machine, is what decides the result.
Pick a shape to see what it does to a surface on impact.
Angular grain: sharp edges gouge and cut a rough anchor profile.
Sand as a blasting media: where it is still used
“Sand blasting” is the generic name for the whole process, explained step by step in our guide to the sand blasting process. As a specific media, silica sand is angular, roughly 7 on the Mohs hardness scale, and cuts a rough, aggressive profile at low cost. It was the original blast media and is still the term most buyers search for, even when the abrasive actually used is something else entirely.
The reason it is named less often as the media of choice today is airborne crystalline silica, which causes silicosis. Silica sand blasting is restricted or banned for professional use in the EU, the UK, Australia and several other markets. In India, the state Factories Rules prohibit sand or any other abrasive containing free silica in blasting apparatus in factories, and Rajasthan restated that prohibition in its Factories (Amendment) Rules 2025. Which rules apply, who they cover and how the exemption route works are set out in our guide to whether sand blasting is banned in India. That is the main reason grit and garnet have taken sand’s place on Indian sites.
Shot blasting, and why steel shot peens rather than cuts
Steel shot is spherical, made by atomising molten steel, and typically runs 40–51 HRC in hardness. A round grain striking a surface has no edge to cut with. The energy compresses the surface instead of gouging it, which is why shot blasting cleans and smooths rather than roughens. It is the media of choice for stripping corrosion off machinery and for finishes where a rough anchor profile is not wanted.
Steel shot is also one of the most recyclable media on this list, holding up for roughly 2,000 to 3,000 cycles through a reclaim system before it is spent, a cost and waste advantage angular consumable media such as sand or copper slag do not share.
Grit blasting, and when angular media is the right call
Steel grit is steel shot that has been crushed rather than left round, which gives it the same 40–65 HRC hardness range as shot but with sharp, broken edges. Those edges cut into a surface the way shot cannot, which makes grit the choice for fast paint and rust stripping and for cutting a defined anchor profile ahead of a coating, the same profiling job a specification like Sa 2.5 calls for, covered in full in our Sa 2.5 surface preparation guide.
Copper slag and garnet do a version of the same job from a different starting material. Copper slag is angular, around 7.5 on the Mohs scale, and cuts fast, but it is a single-use consumable with low recyclability. Garnet is a naturally occurring mineral, angular, 7.5–8.0 Mohs, and is favoured where dust and water contamination matter: confined tanks, marine sites, anywhere the reclaim has to stay clean.
Shot peening is not shot blasting
The two get used as if they were the same word, and the confusion is understandable since both fire round shot. Shot blasting is a cleaning and surface-prep process: high energy, fast coverage, the goal is a clean or smoothed surface. Shot peening is a controlled metal-treatment process: calibrated energy, strictly spherical media, and the goal is compressive residual stress in the part itself, to resist fatigue and cracking. Peening equipment carries far tighter controls than blasting equipment because the outcome being engineered is inside the metal, not on top of it.
If a spec sheet says “shot peen to Almen intensity,” that is a peening callout, not a cleanliness grade, and it is a different process from anything else on this page.
Media compared: sand, steel shot, steel grit, copper slag, garnet, glass bead
Six media, side by side. The wear column is qualitative, not a published figure (Flexihose holds no line-wear test data) and follows directly from shape and hardness: angular media cuts the hose bore the same way it cuts the workpiece; round media does not.
Pick a media
| Media | Shape | Hardness | Typical use | Wear on a blast line |
|---|---|---|---|---|
| Silica sand | Angular | ~7 Mohs | General low-cost profiling | High: angular, abrades the bore |
| Steel shot | Round | 40–51 HRC | Cleaning, polishing, peening | Low: round, gentle on the bore |
| Steel grit | Angular | 40–65 HRC | Aggressive stripping, profiling | High: angular and hard |
| Copper slag | Angular | ~7.5 Mohs | Fast etching, single-use jobs | High: angular; no recycling to offset it |
| Garnet | Angular | 7.5–8.0 Mohs | Confined spaces, water-sensitive sites | High: angular and hard |
| Glass bead | Round | 5–6 Mohs | Smooth, satin finishes | Low: round and comparatively soft |
Shape, hardness and application figures from Kramer Industries’ blasting media comparison chart and GMA Garnet’s abrasive media properties guide. Wear-on-line column is Flexihose’s own qualitative assessment from shape and hardness, not a measured figure.
What the media choice changes about your hose
Angular media such as grit, copper slag and garnet abrade a hose bore faster than round media moving at the same pressure, because the same edges that cut the workpiece cut the lining on every pass. That is why abrasion resistance, not pressure rating alone, is the specification that decides how long a blast hose lasts under angular media. The Flexihose sand blast grade is built with an extra-thick seamless rubber lining free of mineral filler and records a DIN abrasion loss below 60 mm³. See the full range on our abrasion-resistant blast hose page.
Switching from shot to grit on the same line is a legitimate reason to check hose condition sooner than the calendar would otherwise suggest.
Which process for which job
- Stripping paint, rust or scale before a coating: angular media: grit, copper slag or garnet, matched to the surface profile the coating spec calls for.
- Cleaning corroded machinery without adding a rough profile: steel shot.
- A bright, low-stress cosmetic finish: glass bead.
- Confined spaces, tanks, or sites where dust and reclaim contamination matter: garnet.
- Strengthening a part against fatigue, not cleaning it: shot peening, a different process entirely. See above.
Whichever media is chosen, the coating specification that follows, a grade such as Sa 2.5, and the equipment feeding it, covered in sizing the nozzle and compressor, do not change with the abrasive. The media changes the finish and the wear; the standard the finish has to meet stays the same.
Whatever the media, the hose has to hold up to it
Tell us the media, the bore and the pressure and we’ll recommend the right grade.
FAQ
What is the difference between shot blasting and sandblasting?
Shot blasting fires round steel balls that peen a surface without cutting it; sandblasting fires angular sand or grit that cuts into the surface and removes material. Round media polishes and compresses; angular media strips and profiles.
Is shot peening the same as shot blasting?
No. Shot blasting is a cleaning and surface-prep process using high energy for fast coverage. Shot peening is a controlled metal-treatment process using calibrated energy and strictly spherical media to build compressive residual stress inside the part, improving fatigue resistance. They share round media but not a purpose.
Is grit blasting the same as sand blasting?
Not exactly. Both use angular media, but grit usually refers to crushed steel (steel grit) or mineral abrasives such as garnet, while sand blasting specifically means silica sand. Steel grit is far harder (40 to 65 HRC) and more recyclable than silica sand.
Which abrasive causes the least wear on a blast hose?
Round media such as steel shot or glass bead wears a hose bore more slowly than angular media, because there is no cutting edge acting on the lining with every pass. Angular media such as grit, copper slag and garnet abrades the bore faster at the same pressure. Abrasion resistance, not pressure rating alone, is what decides hose life under angular media.
What abrasive is used for surface preparation before painting?
Angular media that cuts a defined anchor profile: steel grit, copper slag or garnet, sized to the roughness the coating specification calls for. Round media such as steel shot does not cut a profile and is not the right choice ahead of a coating that needs one.
Can copper slag or garnet be reused like steel shot?
Not to the same extent. Steel shot and steel grit are highly recyclable, typically holding up for 2,000 to 3,000 cycles through a reclaim system. Copper slag has low recyclability and is largely treated as single-use; garnet is recyclable but wears faster than steel media because it is softer and more brittle.
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