Specifications include, but are not limited to: All softwood plywood shall conform to the latest edition of Product Standard One PSI-95, Group1, and each panel shall be APA Grade-Trademark of the American Plywood Association. Panel shall be BB exterior (Douglas Fir) B Grade, plugged core (Douglas Fir) (Core gaps not to exceed ½”). This material must be suitable for sign manufacture and overlay must be compatible with the adhesive of reflective sheeting’s. The overlay on both faces must be prepared at the time of manufacture so that removal of the release agents (sanding, solvent wiping) is NOT REQUIRED prior to application of reflective sheeting; Simpson “Highway HDO” or comparable. No marks, blemishes or damage of any kind will be allowed. No shop grade plywood will be accepted. All plywood is ½” thickness. Plywood is NOT to be edge sealed.