25S Grit DOT Segment Blue for Hard Concrete

- Aggressive metal-bond diamond segment for the first grinding step — the 25-grit cutting surface opens up the concrete, removes coatings, exposes aggregate, and creates the profile needed for subsequent polishing or coating application. Fits any walk-behind grinder using the Lavina-style "dot" segment pattern (three 9mm mounting holes).

- Engineered specifically for hard concrete — hard concrete (typically 5,000+ PSI, Mohs 7+) doesn't wear diamonds down enough to keep them sharp, causing the segment to "glaze" and slide across the surface without cutting. The soft metal bond (the "S" in 25S) wears away faster on purpose, continuously exposing fresh diamond and keeping the cut aggressive.

- Counterintuitive but correct: soft bond on hard concrete, hard bond on soft concrete — using the wrong bond on a hard slab causes glazing, where the diamonds polish smooth and stop cutting entirely. If you see glazing on the job, switching to this softer bond (or reducing machine weight, slowing RPM, or adding water mist) reopens the diamonds and restores the cut.

- Color-coded by manufacturer for quick identification — the blue designation is Simiron's color code for the hard-concrete bond. Most contractors keep three-color sets on the truck (one bond per concrete hardness category) so the right segment can be selected on-site once the slab is tested.

- First step in a typical grind-and-polish sequence — after the 25-grit metal opens the floor, the progression moves up through finer metal grits (50, 100), then into transitional and resin polishing pads. A clean cut at 25 grit is what makes every step afterward faster — leave scratches here and you chase them all the way to the final pad.