What are the different types of sandpaper and what are they used for?
Aluminum Oxide - A synthetic brown-colour mineral that is tough and durable and is the most widely used abrasive grain. It is ideal for both metalworking and woodworking. (Non-Ferrous)

Silicon Carbide - A very hard and shiny black-colour mineral. This product has a brittle quality that allows it to fracture into sharp sliver-like wedges as it works. Can be used for everything from sanding non-ferrous and ferrous metals, plastics, composites, and wood products.

Garnet - A reddish brown mineral. It is of medium hardness with good cutting edges and has the tendency to break or fracture when used, thus creating new cutting edges. Used primarily for fine finishing of wood.

Alumina Zirconia - A very hard and sharp grain that works well for grinding of stainless steel, spring steel, titanium, and other hard steels and for dimensioning of wood.

Ceramic Alumina - The sub-micron structure of ceramic alumina allows each grain to continually expose sharp cutting points, resulting in cooler cutting action and extended life.