Quality Steel Products made in Korea

Prepainted Steel Sheet with Regular Polyester

Product Description

This most widely used prepainted steel sheet is coated with polyester paint material that is baked on to its surface. Polyester prepainted steel sheet is used for exterior panels and interior design purposes that do not require excessive processing.

- Prepainted steel sheet is coated with paint containing polyester resin

- Most widely used. Generally displays superior workability, durability, and weather resistance

- Used for a variety of purposes; offered in a wide array of colors and degrees of polish

- Sandwich panel, lightweight partition, roof panel, water gutter, shutter, door, boiler cover, iron frame furniture

- Sandwich panel, lightweight partition, roof panel, water gutter, shutter, door, boiler cover, iron frame furniture

Cross section

Applied materials      

Hot-dip galvanized steel sheet

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 an equal thickness of coating.
Depending on the surface treatment of the plated sheet, it is categorized into regular spangle, minimized spangle, or zero spangle ultra smooth, which are symbolized as R, M, Z, respectively. Prepainted steel sheet produced by Dongbu Steel uses ultra smooth material in the production process.

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.

  1. 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 25μ).
  2. 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.
  3. 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).
zinc coating

Special hot-dip galvanized steel sheet

Zn/AL alloy coated steel sheet and galvanized sheet, is available for products requiring particularly high-workability and high-durability. Table 2 lists the applications and contents of these sheets.

zn al


Size availability      


Test items      


Applied specifications      

KS D 3520, KS D 6711
JIS G 3312, JIS G 3321
ASTM A 653, ASTM A 792
EN 10142, EN 10147 etc 

Basic color