What is the difference between PPGI and PPGL，prepainted galvanized steel and galvalume steel?

for the prepainted galvanized steel and prepainted galvalume steel,first,their raw material is different,ppgi material is galvanized steel,ppgl material is galvalume steel,and ppgl service life is much longer than ppgi.

this is the main difference between PPGI and PPGL, which will further influence their features and applications.

the second the price of ppgl is higher than ppgi