Materials shall be alloy type 5052-H38. TOLERANCE: All aluminum sheets shall measure to the specified widths and lengths. Widths shall be uniform to the entire length of each sheet. Length, width, and diagonal tolerance are as follows: Length – 0 plus or minus 3/32 inches. Width – 0 plus or minus 3/32 inches. Diagonal – 3/16 inches maximum. All sheets shall be flat, free from waves, scratches and buckles, corrosion, analysis markings or oil stains, or any blemish which will prevent finishing to a bright uniform surface by a light cleaning process (Bright Dip), which prepares aluminum sheets for the application of paint, reflective sheeting, etc. All sheets shall be stretcher leveled, stress relieved, free of oil and grease, shall be dry and not contaminated with waxes and dirt...
