Polymer Sheet: The Cutting Board Factory. Same physical properties as HDPE but this material is UV Stabilized for marine and other outdoor applications. Impervious to salt and moisture, will not rot or swell like wood, good flexibility and toughness. Sheet Sizes: 1/4 x 54 x 96 3/8 x 54 x 96 1/2 x 54 x 96 5/8 x 54 x 96 3/4 x 54 x 96 1 x 54 x 96 .