Mirka Iridium Premium Sandpaper Ø 6-Inch Hook & Loop, Grit 40 is a premium sanding disc pack for aggressive surface prep and fast material removal. This is a sanding disc designed for heavy stock removal on paint, putty, primer, wood, steel, mineral materials, and plastic. Model Number 24-6MH-040. If you need to strip a surface, level filler, or cut through rough material before moving into refinement, this is the coarse grit you reach for.

The big story here is speed without throwing away disc life. Mirka uses a ceramic alumina and aluminum oxide grain mix that gives the disc an aggressive initial cut, but the grains are also meant to stay sharper longer than basic paper abrasives. On the job, that means less time leaning on the sander waiting for the disc to do something, and fewer swaps when you're working through broad prep work.

The 40-grit rating puts this squarely in rough-prep territory. That makes it a solid fit for taking down body filler, removing coatings, flattening rough wood, and getting stubborn surfaces ready for the next sanding step. It is not a finishing disc, and that is the point. This grit is here to move material fast and get you to the next stage sooner.

Mirka also built this disc around dust control. The multi-hole pattern is there to improve extraction across the face of the disc, and the dust-repellent coating helps reduce clogging and pilling. In real use, that matters because loaded discs cut slower, run hotter, and leave a more inconsistent scratch pattern. Better dust flow helps the abrasive stay open and useful longer.

The backing is flexible paper with hook and loop attachment, which makes changes quick and keeps the disc easy to work with on powered sanding setups that use 6-inch round discs. That flexible backing also helps the abrasive stay planted across curved or slightly uneven surfaces instead of feeling overly stiff and skittery.

This 50-pack makes sense for shops and users who burn through coarse abrasive regularly. If you're doing collision repair prep, paint removal, filler shaping, wood surface leveling, or general sanding where speed matters more than finish quality, this is the right kind of disc to keep on hand in volume. Pros will appreciate the cut rate and dust control. Serious DIY users will appreciate not wasting time with bargain discs that clog too fast.

Mirka Iridium Premium Sandpaper Ø 6-Inch Hook & Loop, Grit 40 Gets Right to Work

This is the kind of coarse sanding disc you buy when the goal is removing material fast, keeping dust under control, and not burning through cheap paper every few minutes.

• Who it's for: Pros and serious DIY users doing paint stripping, filler shaping, rough wood prep, and other heavy sanding jobs.
• Why it stands out: The ceramic and aluminum oxide grain mix, multi-hole extraction pattern, and dust-resistant coating all work toward the same result: faster cutting with less clogging.
• Worth knowing: This is a true rough-prep grit, not a finish disc. If you want a clean final surface, plan on following it with finer abrasive steps.

• What type of work is 40 grit best for? It is best for aggressive sanding tasks such as paint removal, leveling putty or filler, rough wood prep, and other heavy material-removal steps.
• What materials can this sanding disc be used on? Source data lists paint, putty, primer, wood, steel, mineral materials, and plastic.
• What size are these discs? Each disc is 6 inches in diameter.
• How does the disc handle dust? It uses a multi-hole pattern for dust extraction and a coating designed to reduce clogging and dust buildup.