Aluzinc, Galfan, ... coils

Aluzinc coating is composed by 55% aluminum, 43% zinc and 2% silicon. The process is done by hot dip galvanizing.
GALFAN coating consists of 95% Zn + 5% Al, and 1ppm of precious metals, thus providing twice the protection against corrosion than galvanized steel (HDG) of equal weight.