Alc 40417 20/30 grit melamine plastic – 10 lbs. 10lbs, 20/30 grit; melamine plastic grit is the most aggressive plastic abrasive when a fast strip rate of soft metals is desired; melamine is used to clean, strip, de-burr soft metal substrates without generating heat that can warp the surface; melamine can also be used to remove paint, oxidation and some surface rust; melamine produces very little dust and improves visibility in a blast cabinet; melamine is typically used in a blast cabinet or where the abrasive is being recycled