Prepainted Steel Sheet with Anti-Pollution Paint
Anti-pollution paint is applied to improve resistance against stain, oxidation and polluters including carbon, the main culprit of air pollution, by applying the tight-knit resin with hydrophile property.
- Dust and other foreign objects don't stick to the surface.
- With excellent acid resistance and alkaline properties, it is ideal for panel materials and exterior materials for factories.
- Compared to conventional coated steel sheet, it has excellent surface conditions against pollution matters such as sulfurous acid gas.
- Management such as cleaning the building exterior is made easy, thanks to its outstanding resistance to contamination.
- High weather resistance.
How It Works
Even during the rain, a tight-knit layer of hydrophil resin protects the sheet against adhesion of pollutant. Concentrated melamine layer prevents pollutant from passing through the surface layer.
Assessment of carbon black pollution test
Anti-pollution steel sheet shows the least amount of change in color in comparison with other conventional steel sheets
Carbon black solution of 0.5% concentration has been dropped on the Anti-pollution steel sheet and it was heated at 80˚C for 24~48 hours. Then it was washed with water and the color difference was examined.
Assessment of weather resistance and anti-corrosion property
Test Hours: 1000 hrs
* The value yielded from the color difference through naked eye observation.
* Color differences measured by the naked eye and the comparator are the same
Basic property assessment
Cross section of painted product
Hot-dip galvanized steel sheet (KS D 3506, GI)
The cold rolled steel sheet passes through a molten zinc pot containing 97% zinc (0.03% or less AL), undergoing the galvanizing process, which gives each side of the sheet and equal thickness of coating.
Depending on the surface treatment of the plated sheet, the sheet is categorized into regular spangle, minimized spangle, or zero spangle ultra smooth. These are symbolized as R, M, Z, respectively.
Surface types for hot-dip galvanized steel sheet (GI)
While an increased volume of coating enhances the anti-corrosion properties of galvanized steel sheet, the workability is inevitably decreased. Anti-corrosion properties, workability, tension, and elongation must be taken into consideration when selecting plates.
The normal wall thickness of galvanized steel plates refers to the thickness of pre-coated steel plates. The clearance of the machine, therefore, must account for the thickness of the zinc plating indicated in Table 1 as well as the coating thickness (usually 255μ).
Zinc flacks may stick inside the metallic pattern during the deep drawing process, requiring extra caution be taken as this may damage the coating's exterior.
Lubrication oil used in treatment shall not contain chlorine or phosphoric acid, which reacts to zinc. Table 1 shows the zinc weight and coating thickness for hot-dip galvanized steel sheet used for prepainted steel sheet. These figures are adopted by KS (Korean Standards), JIS (Japan Industrial Standards), and ASTM (American Society for Testing Materials).
Table 1 - Weight and thickness of zinc coating
Special hot-dip galvanized steel sheet (KS D 3770, SGL)
Zn/AL alloy coated steel sheet as well as galvanized sheets, are available for products requiring particularly high-workability and high-durability. Table 2 lists the applications and contents of these sheets.
Table 2 - Applications of Zn/AL alloy coated steel sheet
KS D 3520
JIS G 3312
ASTM A 653