Slag removal brushes
Slag is hardened, re-solidified material stuck to the underside of a thermal cut. Deslagging brushes use steel pins that strike it off. You choose a pin hardness (1 to 4) and a single or double row.
See it in action
Video: Removing Slag from plasma, laser and oxy cut parts. Watch on YouTube
Pin hardness
| Hardness | Pins | Use it for |
|---|---|---|
| Hardness 1 | Flexible pins with low pressure that protect the edges | Most jobs, the usual starting point |
| Hardness 2 | Flexibly mounted pins with a bit more bite, still edge-friendly | Slag that Hardness 1 leaves behind |
| Hardness 3 | Hard-bearing pins with a strong impact | Slag that will not let go |
| Hardness 4 | Extra-hard pins | Heavily stuck-on slag |
Single or double row
| Option | What it means |
|---|---|
| Single row | Lighter, fewer pins in contact |
| Double row | More pins working at once |
Slag, burrs and oxide are different
A burr is a thin ridge of displaced metal from cutting or punching. Slag is hardened material stuck to the edge, mostly from plasma and oxy-fuel cutting. Oxide is a thin dark layer on the cut surface. Plasma and flame cuts often have more than one, and may need two steps: slag brush first, then a deburring disc or an oxide brush.
What we need to recommend one
Your machine and brand, the brush size and connection, the material and thickness, how the part was cut, and how stuck-on the slag is. If you are unsure of the hardness, we start you at Hardness 1 and adjust.
Common questions
Which pin hardness should I start with?
For most jobs, Hardness 1 is enough and protects the part edges. Step up only when slag is heavy or very stuck-on.
What is the difference between slag and a burr?
A burr is a thin ridge of displaced metal. Slag is hardened molten material bonded to the edge, mostly from plasma and oxy-fuel cutting, and usually needs a more aggressive tool.
Do I need single or double row?
Double row puts more pins to work at once, which helps with heavier slag. Single row is lighter. Tell us your part and we will choose.
Will a slag brush damage thin parts?
Lower hardness levels use flexible pins at low pressure to protect edges. Tell us the thickness and material so we can match the hardness.
Can I remove slag and round the edge in one step?
Often it takes two steps: remove slag with a brush, then round the edge with a deburring disc.
Related: Burr and slag removal · Edge rounding · Oxide removal · Satin and polish · Full FAQ · Material and cutting-method guides · Deburring discs