The world’s First Biodegradable Pen Made From Corn! A “biodegradable” product has the ability to break down, safely and relatively quickly, by biological means, into the raw materials of nature. Once biodegraded, this product would safely become part of the natural ecology of its environment. Corn Plastic is a completely biodegradable plastics made entirely of corn starch. Corn plastic has been widely used as packaging and household products. It is a greener substitute of conventional plastic.