Like a couple guys mentioned- formica, or by the generic name- plastic laminate.
I've used it on several of my workbenches for years and it holds up well, gives a flat surface to work on, and you can clean surface gunk off it with anything from a washcloth up to a power sander- depending on what gunk you get on it. Nice flat surface to set tools, cases, guns, and other equipment on and won't react to oils, solvents, or just about anything.
Bob
