[Alberg30] Mast Beam Material

[EddieDiver at aol.com]

Yes, T5 ,T6 , etc. refer to temper of the aluminum. For example, large 
commercial aluminum flagpoles are made from T6 as it is strong yet flexible. 
Aluminum sheet for architectural uses is usually made from T5 temper as the 
tempering does not effect the ability of the silver aluminum to be color 
anodized brown, black, gold. Many aluminum curtainwall buildings are composed 
of aluminum extrusions of one alloy and temper that will accept color 
anodizing. The flat sheet aluminum panels between floors are made from sheet 
with alloy 3003, H (hardness) 13, and temper T5. Both will accept color the 
same but each has properties of being easily extruded, rolled flat, strength 
with flexibility, etc. Ed. Schroeder Hull 303
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