PPGL stands for Pre-Painted Galvalume Steel, commonly known as color-coated steel sheets or color-coated steel coils. It uses Galvalume steel (GL) as its substrate.
Simply put, PPGL = Substrate (Galvalume steel) + Chemical pretreatment layer + Primer + Topcoat.
Technical Parameters of PPGL (Prepainted Galvalume Steel)
| Parameter Category | Detailed Specifications |
|---|
| Substrate | Galvalume (GL), coating composition: 55% Al + 43.5% Zn + 1.5% Si |
| Common Grades | DX51D+AZ, S250GD+AZ, S350GD+AZ, CGCC, ASTM A792 |
| Thickness Range | 0.12mm – 1.5mm (regular), up to 2.0mm in some production lines |
| Width Range | 600mm – 1250mm (regular), up to 1500mm in some cases |
| Coating Weight | AZ50 – AZ150 (double-sided, unit: g/m²) |
| Coating Type | Polyester (PE), Silicone-Modified Polyester (SMP), High Durability Polyester (HDP), Polyvinylidene Fluoride (PVDF) |
| Coating Structure | 2-coat 2-bake (primer 5-10μm + top coat 15-30μm), back coat 5-8μm |
| Color | Customized according to RAL color card or customer samples |
| Inner Diameter | 508mm or 610mm |
| Coil Weight | 3 – 10 tons per coil |
| Corrosion Resistance | Neutral salt spray test ≥ 1000 hours (no red rust), better than PPGI |
| Mechanical Properties | Yield strength: 245-550 MPa; Elongation ≥ 8% |
| Executive Standards | GB/T 12754, EN 10169, ASTM A755/A792, JIS G3322 |
Common Grades (by Standard System)
| Standard System | Common Grades | Description |
|---|
| China GB / Europe EN | DX51D+AZ | Most common commercial grade, suitable for general bending, forming and roll forming. |
| China GB / Europe EN | DX52D+AZ / DX53D+AZ | Drawing and deep-drawing grades, used for parts requiring complex forming. |
| China GB / Europe EN | S250GD+AZ / S350GD+AZ / S550GD+AZ | Structural grades with higher yield strength, used for load-bearing components. |
| Japan JIS | CGCC (Substrate equivalent to SGCC/SGLCC) | The most common color-coated steel grade in Japanese Industrial Standards. |
| Japan JIS | CGC340 / CGC440 / CGC570 | Numbers indicate tensile strength (MPa). CGC570 corresponds to high-strength materials such as G550. |
| USA ASTM | A755M CS-B | Commercial grade, widely used in building envelope systems. |
| USA ASTM | SS255 / SS275 / SS550 | Structural grades; numbers indicate minimum yield strength (MPa). |
