The Fascinating World of Steel: Difference Between PPGI 0183;32;PPGL or prepainted galvalume steel, on the other hand, is coated with a mix of aluminum, zinc and other trace elements. The usual composition of galvalume coating is 55% aluminum, 43.4% zinc and 1.6% trace elements. Attributed to the difference in their coatings, PPGI and PPGL steel consequently vary in their properties as well.
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