Hall Signs aluminum blanks are manufactured per U.S. Bureau of Public Roads standards and have holes for mounting and radius corners in accordance with the Federal Highway Administration (FHWA) Manual on Uniform Traffic Control Devices (MUTCD). Our aluminum blanks and signs are chemically treated at our Bloomington, Indiana facility to meet ASTM B449 specifications as pretreatment for paint or sheeting applications.
Alodized Aluminum blanks are bare metal, without paint or sheeting, and ready for use at your shop.
Aluminum Gauge and Alloy
Hall Signs offers aluminum blanks and signs in a variety of gauges (thicknesses) and alloys (mixtures). Aluminum gauge is measured in inches is determined by the overall thickness after the ingot, or formed block of aluminum, has been rolled into a coil or sheet.
Aluminum alloys are graded and these “grades” refer to the “strength of the mixture.” Unlike gauge, the difference between alloys cannot be seen just by looking at the material. Hall Signs offers blanks in several industry standard alloys, including 3105 and 5052, which are the most commonly used in the sign industry.
Alloy 3105 is a post-consumer and industrial recycled aluminum mix that uses a variety of materials, from aluminum cans to airplane grade aluminum. 3105 offers an optimum combination of price and performance, and using recycled materials benefits our environment and your budget!
Alloy 5052 is an aluminum mix that does not contain any recycled aluminum content. Many states require that traffic signs be manufactured with 5052 alloy aluminum, so be sure to check with your local agency before ordering.
The table below lists the gauges and alloys we carry and how those materials are typically used.
In addition to our “flat” aluminum blanks, Hall Signs also offers “extruded” aluminum blanks. Rather than being rolled flat into sheets or coils, extruded aluminum is pressed into shape with special molds and shipped in long sticks or pre-cut pieces. Extruded aluminum is available in two styles, bulbed and ribbed, and one alloy mix, 6063.
Both types of extrusions feature structural reinforcements to increase the structural integrity of the pieces. Bulbed extrusions are most commonly used to manufacture street name signs (page 26) and are available in pre-cut sizes, custom cuts, or 145” long sticks. Ribbed extrusions are most commonly used to manufacture the R15-1 Railroad Crossing “Crossbuck” signs and are exclusively available in 48” x 9” lengths.