All correspondence must be made through the Vendor Portal. Specifications include, but are not limited to: This specification covers the requirements and processing of flat sheet aluminum sign blanks to which a chemical conversion treatment coating has been applied. Aluminum. Blanks shall conform to ASTM-B209; Alloy 5052-H38 or 6061-T6. The manufacturer shall on the bid document indicate the specific ASTM Aluminum Alloy on which the bid is based and from which the aluminum sign blanks will be fabricated and furnished. Failure to select one or more of the Aluminum Alloys specified above and to indicate the selected alloy(s) on the bid document shall be cause for rejection of the vendor's bid. Chemical Conversion Coating. The chemical conversion coating to be employed in the preparation of aluminum sign blanks shall conform to ASTM B 921 Class 1 or ASTM B 449 Class 1, and the coating material shall be included on the QPL-81706-15 Amendment 3 list or subsequent editions thereto. The chemical conversion treatment shall be completed after the blanks have been fabricated, including the punching of all holes. All procedures used in the conversion coating process must comply with the recommendations of the manufacturers of retroreflective sheeting materials listed in Department Publication 35 Section 1103.02(c).
