PPGI/PPGL

PPGI (Pre-painted Galvanized Steel) and PPGL (Pre-painted Galvalume Steel) both belong to the pre-painted steel coil series. They are composite anti-corrosion and decorative profiles made of different coated substrates through processes such as surface pretreatment, roller coating of organic coatings, and high-temperature baking curing. Combining the strength of steel, the corrosion resistance of the coating layer and the decorativeness of the paint layer, they are efficient and environmentally friendly materials widely used in modern industrial, construction, home appliance and other fields. The core difference lies in the composition of the substrate coating.
PPGI and PPGL share the core production process, which both include uncoiling, surface cleaning, chemical conversion treatment, primer roller coating, curing, topcoat roller coating, secondary curing, inspection, slitting and coiling. These processes ensure that the coating is closely combined with the substrate with strong adhesion, and can be flexibly subjected to deep processing such as slitting, bending, stamping and welding to meet diverse forming needs. Among them, PPGI uses hot-dip galvanized steel sheet (GI) as the substrate, with zinc as the main component of the coating; PPGL uses hot-dip galvalume steel sheet (GL) as the substrate, and the coating is composed of 55% aluminum, 43.5% zinc and 1.5% silicon. Both can choose different types of organic coatings such as PE, SMP, HDP and PVDF to match the performance requirements of different application scenarios as needed.
The two have their own focuses on core characteristics and significant common advantages: both have excellent corrosion resistance, weather resistance and decorativeness, with bright and smooth surface, which can be customized into matte, high-gloss, wrinkle, printing and other surface effects according to needs. They are environmentally friendly and recyclable, with low later maintenance costs, and no additional anti-corrosion and decorative treatment is required. Specifically, PPGI has outstanding cost performance and good corrosion resistance, suitable for scenarios with mild corrosion environment, and its service life can reach 15-25 years; relying on the advantages of aluminum-zinc alloy coating, PPGL has better heat resistance (able to withstand a maximum temperature of 315℃) and corrosion resistance, with a salt spray test of more than 1500 hours, a service life extended to 25-50 years, and lighter weight. It is suitable for harsh environments such as coastal areas, industrial corrosion and high temperature, with relatively high cost.
PPGI/PPGL have a wide range of applications with their own focuses: PPGI is mostly used in the construction field (roofs, walls, enclosures in non-corrosive environments), home appliance manufacturing (refrigerator and washing machine casings), interior decoration (furniture frames, decorative panels) and civil facilities; PPGL is more suitable for coastal infrastructure, industrial plants, high-temperature equipment casings, new energy automobile parts, photovoltaic brackets and other scenarios with high requirements for corrosion resistance and heat resistance. With the comprehensive advantages of "high strength, high appearance, easy processing and strong durability", the two have gradually replaced traditional steel and paint decorative materials, becoming indispensable composite basic materials in modern high-end manufacturing and engineering construction. They are suitable for different process standards such as two-coat two-bake (building material panels) and three-coat three-bake (home appliance panels), and their specifications can be customized according to thickness (0.12-2.0mm) and width (600-1500mm) on demand.