Hardboard Placemats

hardboard
Stiff board made of compressed and treated wood pulp
Hardboard, also called high-density fiberboard, not to be confused with Hardwood, is a type of fiberboard, which is an engineered wood product.
chipboard: a cheap hard material made from wood chips that are pressed together and bound with synthetic resin
A substance manufactured by pressing wood fibers into sheet goods to be used as building material.

placemats
A placemat is a protective table pad usually made of paper, plastic or cloth for restaurants and households. Asian-style placemats may feature thin slats of bamboo or colourful beads. The term is derived from the mat being put at a person's "place" (chair) at a table.