Description: The unpainted aluminum must have the following PROPERTIES: Alloy: 3105-H19, 3105-H-22, or 3105-H-24, with a strong preference for 3105-H-19. Thickness: .022” + or - .0015”. Width: Standard Size – 12 1/8” + or – 1/32”. Motorcycle Size – 7” + or – 1/32”. Minimum Ultimate Tensile Strength: 28,000 psi. Quality: Clean and suitable for stamping. Surface finish: Treated with a light, tightly adherent conversion coating approved by the current State of Iowa Reflective Sheeting supplier. Coating to be applied in conformance with specifications outlined in ASTM B921. Free of any powdery residue, oil or any other foreign materials, which may affect adhesion of reflective sheeting. Aluminum pretreated with Bonderite M-CR 1430C is recommended. Additionally, a non-hexavalent chromium coating in addition to the Bonderite M-CR 1430C will be acceptable. Coating Weight: 10 to 35 mg/ft2 with a median of 25 mg/ft2 as the optimum...
