PPGI is the abbreviation of Pre-Painted Galvanized, that is, pre-painted galvanized.Usually refers to steel products such as PPGI Coil (color coated galvanized coil), PPGI Sheet (color coated galvanized sheet).
PPGI roll substrate classification: Hot-dip galvanized substrate:
The product obtained by coating organic coatings on hot-dip galvanized steel panels is hot-dip galvanized color-coated panels. In addition to the protective effect of zinc, the hot-dip galvanized color-coated sheet also has an organic coating on the surface that protects and prevents rust, and has a longer service life than hot-dip galvanized sheets. The zinc content of hot-dip galvanized substrates is generally 180g/m2 (double-sided), and the zinc content of hot-dip galvanized substrates for exterior buildings is up to 275g/m2.
Hot dipped aluminum zinc substrate:
Hot-dip aluminum-zinc steel plate (55% Al-Zn) is used as the new coating substrate, and the aluminum-zinc content is usually 150g/㎡ (double-sided). The corrosion resistance of hot-dip galvanized sheets is 2-5 times that of hot-dip galvanized sheets. Continuous or intermittent use at temperatures up to 490°C will not cause serious oxidation or scale. The ability to reflect heat and light is twice that of hot-dip galvanized steel, and the reflectivity is greater than 0.75, making it an ideal building material for energy saving. Electro-galvanized substrate:
The product obtained by using an electro-galvanized sheet as the substrate, coating it with organic paint and baking it is an electro-galvanized color-coated panel. Since the zinc layer of the electro-galvanized sheet is thin and the zinc content is usually 20/20g/m2, this product is not suitable for use. Make walls, roofs, etc. outdoors. However, due to its beautiful appearance and excellent processing properties, it can be mainly used in home appliances, audio, steel furniture, interior decoration, etc.
Characteristics of color-coated coil substrate:
Electro-galvanized substrate: The coating is thinner and its corrosion resistance is not as good as that of hot-dip galvanized substrate;
Hot-dip galvanized substrate: a thin steel plate is immersed in a molten zinc bath to adhere a layer of zinc to the surface. This galvanized plate has good paint adhesion and weldability.
Hot dipped aluminum zinc substrate:
This product is plated with 55% AL-Zn and has excellent anti-corrosion properties. Its service life is more than four times that of ordinary galvanized steel sheets. It is a replacement product of galvanized sheet.
Features:
(1) It has good durability and corrosion resistance and has a longer lifespan than galvanized steel plates;
(2) It has good heat resistance and is less likely to discolor at high temperatures than galvanized steel plates;
(3) Has good heat reflectivity;
(4) It has processing performance and spraying performance similar to those of galvanized steel sheets;
(5) Has good welding performance.
(6) It has good performance-price ratio, durable performance and extremely competitive price. Therefore, whether it is architectural designers, engineers or manufacturers, galvanized steel sheets have been widely used in industrial buildings, steel structures and civil facilities, such as garage doors, gutters and roofs.
PPGI coil coating types:
polyester
Good adhesion, rich colors, wide range in formability and outdoor durability, medium chemical resistance, low cost.
Silicon modified polyester
Namely (SMP), the hardness, abrasion resistance and heat resistance of the coating film are good, as well as good external durability and chalking resistance, gloss retention, average flexibility, and medium cost.
High durability polyester
Namely (HDP), excellent color retention and UV resistance, excellent outdoor durability and chalking resistance, good paint film adhesion, rich colors, and excellent cost performance.
Polyvinylidene fluoride
Namely (PVDF), excellent color retention and UV resistance, excellent outdoor durability and chalking resistance, excellent solvent resistance, good formability, dirt resistance, limited colors, and high cost.
