The CRL 3M® Diamond Disc offers tremendous life compared to a standard silicon carbide disc. In addition, the edge quality is consistent throughout the life of the disc. This is because diamonds wear much slower than silicon carbide. Since diamonds cut rather than scratch like sandpaper, less pressure is required to accomplish the same material removal. Disc life and finish will always be improved when used with water. If the disc is not used on a CRL Electric Polisher, water can be supplied by using a spray bottle or spray delivery system for best results. If used dry, wear appropriate dust protection equipment to guard against health hazards. When working on clean cut (sharp edge) glass, use light pressure on first pass to remove sharp edges. Then increase pressure to suit desired grinding rate. Disc backing material is impervious to water. Although considerably more expensive, diamond discs can offer savings in situations where disc changing time or consistency of edge finish is critical.