Before we start discussing the difference between the two, it’s important you know what the terms “PPGI” and “PPGL” expand to. PPGI, which refers to Pre-painted galvanized iron steel. While PPGL stands for Pre-painted galvalume steel. Both of these steel variants are also known by the name of color coated steel in the industry.
So, what’s the difference between PPGI Steel Coil and PPGL Steel Coil?
The primary difference between the two types of steel coil is in the coating applied to each variant. PPGI or pre-painted galvanized iron steel coil is evenly covered with a layer of zinc. The zinc coating provides anodic protection to the base material, prolonging the product’s service life.
PPGL or pre-painted galvalume steel coil, 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 Steel Coil and PPGL Steel Coil consequently vary in their properties as well.
1、PPGL Steel Coil offers a smoother finish than PPGI Steel Coil.
2、 Corrosion in PPGL Steel Coil spreads, whereas in PPGI Steel Coil it remains localized and does not spread easily.
3、PPGL Steel Coil is more corrosion resistant than PPGI Steel Coil, however, its cut edges are less protected. This is because of the steel coating’s honeycomb structure, which does not provide sufficient protection to exposed edges.