PART 2
PRODUCTS
2.1
MATERIALS
2.1.1
Aluminum
Shall be free from defects impairing strength or durability of surface
finish. Standard alloys shall conform to standards and designations of AA
ASD1. Special alloys, not covered by the following ASTM specifications,
shall conform to standards and designations recommended by the manufacturer
for the purpose intended.
2.1.1.1
Wrought Aluminum Alloys
Shall be those which include aluminum alloying elements not exceeding the
following maximum limits when tested and additional in accordance with ASTM
E 34. These limits apply to both bare products and the core of clad
products. The cladding of clad products shall be within the same limits
except that the maximum zinc limit may be 2.5 percent in order to assure
that the cladding is anodic to the core. Special wrought alloys with a
silicon content not more than 7.0 percent will be acceptable for limited
structural uses where special appearance is required:
ALLOY
PERCENT
Silicon
1.5
Magnesium, Manganese, and
Chromium combined
6.0
Iron
1.0
Copper
0.4
Zinc
1.0
Within the chemical composition limits set forth above, wrought aluminum
alloys shall conform to the following:
a.
Extruded bars, rods, shapes and tubes:
ASTM B 221M ASTM B 221.
b.
Sheet and Plate:
ASTM B 209M ASTM B 209.
2.1.1.2
Cast Aluminum Alloys
Provide those in which the alloying elements are silicon, magnesium,
manganese, or a combination of these. Other elements shall not exceed the
following limits:
ELEMENT
PERCENT
Iron
1.2
Copper
0.4
Nickel
0.4
Titanium
0.2
SECTION 08900
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