PPGI stands for pre-coated galvanized steel sheet, which refers to a color-coated steel sheet made by applying an organic coating to a galvanized steel substrate after pretreatment.

PPGL stands for pre-coated galvanized steel sheet, which refers to a color-coated steel sheet made by applying an organic coating to an galvanized steel substrate after surface treatment.

Different base materials:

PPGI is pre-coated galvanized steel, using galvanized sheet metal as the base metal with a zinc coating on the surface.

PPGL is pre-coated galvanized steel, using galvanized sheet metal as the base metal.

Different lifespans:

Galvanized steel generally has a service life of 10-15 years. Once the zinc coating is completely corroded, the base material will be damaged.

Alu-zinc coatings offer greater corrosion resistance and have a lifespan three times longer than PPGI.

Weight Difference:

For the same coating thickness, Al-Zn coatings are lighter than zinc coatings due to the lower specific gravity of aluminum. At the same weight, Al-Zn coatings can cover 3% more space than GI sheets.

Appearance Differences:

PPGL sheets have a smoother surface than PPGI sheets because aluminum adheres better than zinc. Therefore, PPGL sheets can be painted directly without pre-treatment, while PPGI sheets require pre-treatment.

Different heat resistance:

PPGL sheets have better heat resistance than PPGI sheets, with a temperature resistance of 315°C. PPGI sheets, on the other hand, have relatively poor heat resistance.

Different Applications:

Both PPGI and PPGL are widely used in applications such as wall panels and roofing. PPGL, however, is more suitable for harsh outdoor environments, such as those with high rainfall. Its excellent heat resistance and surface conductivity make it widely used in chimneys, ovens, and lampshades. PPGI, on the other hand, is suitable for hot or cold environments.

In Summary

PPGI (pre-painted steel): represents "strong and durable," like "heavy armor," and is suitable for applications requiring strength and low cost.

PPGL (pre-painted aluminum): represents "lightweight and corrosion-resistant," like "light cavalry," and is suitable for applications requiring lightweight, high corrosion resistance, and complex designs.