PPGL stands for pre-painted galvalume steel, which is a kind of color-coated steel with GL as substrate. It combines the strength of steel with excellent anti-corrosion of Zn-Al coating. The galvalume coating is made of 55% aluminum, 43.4% zinc, and 1.6% silicon. Except for their excellent corrosion resistance, PPGL sheets also have high thermal reflectivity, which makes them heat-resisting. Let’s review more details.

Structure of PPGL Sheet

From top to bottom, it consists of the top coating layer, primer coating, pre-treatment coating, Al -Zn coating, base metal, Al-Zn coating, pre-treatment coating, primer coating, and top coating. The base metal is the most inner part, which often uses cold rolled steel, which is covered with Al-Zn coating. This is the GL sheet. Then PG sheets will be cleaned and degreased to form a layer of passivated metal chromate on the surface, which makes it easy to paint. A primer is a preparatory coating on materials to ensure better adhesion and also provide additional protection. While the finish coat makes the surface smooth and good-looking. Generally, the top coating is thicker than the back coating. Here is a picture for your reference.

PPGL Sheet Production Process

The substrate sheet first goes through a pre-treatment system for smoothing, cleaning, and degreasing. After that, a chemical conversion coating layer is formed. Then it will go through the coil coating process to be painted. The most commonly used method is double-sided and double-painted, which means both sides are painted twice. For special uses, it can be painted less or more. Then you will get PPGL coils for sale. And you can profile or shear the coils into sheets on the basis of your requirements. 

Applications of PPGL Sheets

PPGL sheets are extensively used in construction, automobile, home appliances, etc.

Construction: roofing, wall system, makeshift house, granary, greenhouse, etc.

Automobile: muffler, exhaust pipe, windshield wiper, accessories, fuel tank, truck box, etc. Home appliances: refrigerator backboard, gas stove, air conditioner, microwave oven, backlight, electric cabinet, heat exchanger, dryer, etc.

Conclusion

Pre-painted galvalume steel combines utility with beauty. Compared to PPGI steel, it is more resistant to corrosion, high temperature, and weather. Also, its surface smoother, which means it is more suitable for decorative or delicate uses. Its service life is about 3-6 times longer than that of PPGI. More than that, it can be punched, cut, profiled, or in any way possible to meet different requirements. If you are interested, please contact us for more information.