FP-96 English Version - Eastern Federal Lands Highway Division

Section 718718.02 Test Procedures. Conform to ASTM D 4956, except SupplementaryRequirement S1, Fungus Resistance, is amended as follows: The stock culturesof Aspergillus niger, ATCC no. 6275, may be kept for not more than 4months in a refrigerator at a temperature from 37 to 50 bF. Use subculturesincubated at 82 to 86 bF for 10 to 14 days in preparing the inoculum.718.03 Plywood Panels. Furnish exterior type B-B high-density overlayplywood or better conforming to NIST specification PS-1 for construction andindustrial plywood. Use 0.50-inch thick plywood for sign panels with a facialarea 4 square feet or less and the horizontal dimension no greater than thevertical dimension. Use 0.75-inch thick plywood for larger panels.Abrade, clean, and degrease the face of the plywood panel according to methodsrecommended by the manufacturer of the retroreflective sheeting. Treatthe edges of the plywood panel with an approved edge sealant.718.04 Steel Panels. Furnish 0.079-inch continuous coat galvanized sheetsteel blanks conforming to ASTM A 525. Mill phosphatize the zinc coating(designation G 90) to a thickness of 0.0035±0.00175 ounces per square footof surface area.Furnish panels with a substantially plane surface. Do not use twisted or buckledpanels. Clean, degrease, or otherwise prepare the panels according tomethods recommended by the sheeting manufacturer.718.05 Aluminum Panels. Conform to ASTM B 209, alloy 6061-T6 or5052-H38.Fabricate all temporary panels and those permanent panels that are 30 by 30inches or smaller from 0.080-inch thick aluminum sheets. Fabricate largerpermanent panels from 0.125-inch thick aluminum sheets.The blanks shall be free from laminations, blisters, open seams, pits, holes, orother defects that may affect their appearance or use. The thickness shall beuniform and the blank commercially flat. Perform shearing, cutting, andpunching before preparing the blanks for application of reflective material.Clean, degrease, and chromate the blanks or otherwise properly prepare thepanels according to methods recommended by the sheeting manufacturer.751