A panel for use in siding is disclosed. The panel has a cement core in a shape defining the panel of the siding, and a plastic film layer attached to the cement core. The plastic film layer is either a polymer or a copolymer of vinyl chloride. The panel may also have an adhesive layer which adheres the...http://www.google.es/patents/US6358585?utm_source=gb-gplus-sharePatente US6358585 - Ectrudable cement core thermoplastic composite
