PPGL Roofing Sheet Is Durable and Long-lasting

PPGL steel stands for pre-painted galvalume steel and is metal that has been coated by Galvalume, a trademark name of Bethlehem Steel since 1972. This coating uses a mixture of aluminum, zinc, and some trace elements 5 in a ratio of 55:43.4:1.6. It offers a smoother finish than galvanizing, a similar zinc coating applied to form galvanized steel or PPGI. It, PPGL, is more resistant to corrosion than PPGI. These coated sheets can then be punched, pressed, or roll-formed, allowing them to be made into various configurations of roofing sheets.

Exposure Test of Color Coated Steel

PPGL steel comes in large diameter coils that are then formed into smaller panels for the manufacture of various types of roofing sheets with different configurations. A PPGL steel roofing sheet is made rustproof by the galvalume coating that protects it from natural calamities and has resistance to ice, rain, and snow, provided to it by the coating that is made from aluminum and zinc. The process used for the coating is the hot-dip process which gives a coating of 1 mil. The steel sheets are then further coated with primer and paint to give them the desired color. The paints used can vary and are designed to suit industrial requirements.

The types of profiles that are common in roofing sheets are many, from corrugated, Trafford, round rib, and combinations depending on the requirement. Special profiles can also be manufactured to suit architectural requirements. You can also add insulation to the sheet, and this allows it to be used even to cover cold storage buildings. Roofing sheets are made in standard lengths, and this requires them to be overlapped by the sheet above to reduce the chances of leakage. Widths are also standard, and adjacent roofing sheets are made to overlap each other as per the configured shape of the roofing sheet to provide the same protection.

PPGL Roofing Sheet Designs

PPGL roofing sheet is durable and can last more than a decade or two, with the chances of rusting being very slim. The thin coating of galvalume is more pleasing, aesthetically, and gives much better performance than galvanized sheets, when exposed to water and any other liquids that can cause the oxidation of steel. GI sheets are cheaper than PPGL sheets. Where they have an advantage over PPGL sheets is that any corrosion in them tends to remain localized, while in PPGL sheets, this corrosion will spread. Cut edges of PPGL sheets are less protected and need to be treated separately.

PPGL Steel Sheets

PPGL sheets for roofing go through the Galvalume process at the manufacturer after which they are then formed into the various profiles. The roofing sheets then go through a process of chromatin which forms a thin gel-like film over the aluminum-coated surface. A primer that suits the paint that is to be applied, is then laid on. A top coat and backer coat of the desired color of paint are then applied. Guard films are then placed over the roof sheets for added protection, though this is not needed. The sheets are then dispatched to the customer. If you want to buy PPGL roofing sheets, you can contact Wanzhi Steel, a good steel manufacturer in China with more than 20 years of trade experience you can trust.