What is the hardest sandpaper?

Silicon Carbide: Sandpaper with a silicone carbide abrasive is very hard, harder than either aluminum oxide or garnet. This hardness makes it a great choice for sanding metal, for paint removal, and for use on plastic and fiberglass.Click to see full answer. People also ask, what are the different grades of sandpaper?Sandpapers are commonly graded as coarse (40 to 60 grit), Medium (80 to 120), Fine (150 to 180), Very Fine (220 to 240), Extra Fine (280 to 320) and Super Fine (360 and above). Sanding with progressively finer grits removes the scratches left by the previous paper and eventually leaves a smooth finish.Similarly, what is the highest grade of sandpaper? Grits of 240, 320 and 400 are termed very fine, while extra- or superfine sheets with grits of up to 600 are best-suited for polishing jobs. Furthermore, what is the roughest sandpaper? For heavy sanding and stripping, you need coarse sandpaper measuring 40- to 60-grit; for smoothing surfaces and removing small imperfections, choose 80- to 120-grit sandpaper. For finishing surfaces smoothly, use a super fine sandpaper with 360- to 600-grit.What is a 220 grit sandpaper normally used for? The Center of the Grit Scale That makes 220-grit the coarsest paper used for sanding finishes. Finishers usually use it to smooth sealing and finish coats before applying another coat of finish.