Alclad

The trade name registered by the Aluminum Company of America for clad structural aluminum alloy. Aluminum alloy corrodes easily, but pure aluminum does not. Alclad sheets are made of high-strength aluminum alloy sandwiched between thin layers of pure aluminum. The coatings of pure aluminum, which are rolled onto the alloy sheet in the rolling mill, make up about five percent of the thickness of the sheet. Alclad sheets resist corrosion as long as the cladding is not scratched through or worn off.