The base materials are different: PPGI (polytetrafluoroethylene) is the abbreviation for pre-painted galvanized steel, while PPGL is the abbreviation for pre-painted galvanized steel. As the name suggests, PPGI uses galvanized sheet (with a coating of zinc) as the base metal. PPGL is based on a galvanized steel sheet, which is coated with 55% aluminum, 43.3% zinc and 1.6% silicon. This is the main difference between PPGI and PPGL, which further impacts their functions and applications.

Different lifespans: Both zinc and aluminum-zinc layers are used to protect metal from rusting, thereby extending its service life. For galvanized steel sheets, when the galvanized layer is completely corroded, the base material will be damaged. Generally speaking, the service life of galvanized sheet can reach 10 to 15 years. The aluminum and zinc alloys form microscopic grain regions. The zinc-rich phase corrodes preferentially, while the aluminum-rich phase corrodes very slowly. Therefore, Al-Zn coating is more corrosion-resistant than galvanized steel sheet. According to data, the service life of polylactic acid is 3 times longer than that of PPGI.

Appearance Difference: The surface of PPGL sheets is smoother than that of PPGI sheets. This is because aluminum adheres better than zinc. For the same reason, PPGL sheets can be painted directly without pre-treatment. However, PPGI sheets require pre-treatment.

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