Wikipedia
Homasote
Homasote is a brand name associated with the product generically known as cellulose based fiber wall board, which is similar in composition to papier-mâché, made from recycled paper that is compressed under high temperature and pressure and held together with an adhesive. It is 1/2 inch thick and comes in sheets 4 by 8 feet. The Homasote Company operates a factory in the West Trenton section of Ewing Township, New Jersey.