Century WPC Door In Century WPC Doors, polymers are reinforced by adding wood powder and fibers that are discharged from mills and factories as Agricultural Residues. Because of the high cellulose content, it assumes many of the same characteristics of wood. Features:100% recyclableGraded density100% waterproofFire retardant100% termit proof100% formaldehyde, phenol & toxin freeBacteria & fungus proofNo shrinking or swelling Technical Specifications: