PPGI vs PPGL: Which One Should You Choose for Roofing Sheets?

PPGI and PPGL are both color coated steel coils used for roofing sheets, wall cladding, sandwich panels, building profiles, and industrial products. They look similar after painting, but their base materials are different.

PPGI means prepainted galvanized steel coil. PPGL means prepainted galvalume steel coil. The main difference is the metallic coating under the paint layer.

What Is PPGI?

PPGI is made by applying paint coating onto galvanized steel. The galvanized substrate has a zinc coating layer, which helps protect the steel from corrosion.

PPGI is widely used because it is practical, cost-effective, easy to process, and suitable for many common building applications.

It is often used for roofing sheets, wall panels, appliance panels, ceiling panels, commercial buildings, and general construction materials.

What Is PPGL?

PPGL is made by applying paint coating onto galvalume steel. The galvalume substrate has an aluminum-zinc coating layer, which provides good heat reflectivity and corrosion resistance.

PPGL is often selected for roofing sheets and outdoor building applications where better weather resistance is required.

Key Differences

Which One Is Better for Roofing?

For normal roofing sheet production, both PPGI and PPGL can be used. The right choice depends on climate, budget, coating type, expected service life, and customer requirement.

If the project focuses on cost and general performance, PPGI is often a good choice. If the project is in a hot, humid, coastal, or strong UV environment, PPGL may be more suitable.

Paint type also matters. A high-quality paint system such as HDP or PVDF can improve outdoor durability. Buyers should not only compare PPGI and PPGL, but also consider coating weight, paint type, thickness, and forming performance.

FAQ

Is PPGL always better than PPGI?

Not always. PPGL often performs better in many outdoor applications, but PPGI can be more economical and suitable for many common projects.

Can both PPGI and PPGL be customized by RAL color?

Yes. Both can be supplied with RAL colors or customized colors.

What should I choose for roofing sheet production?

Please confirm thickness, coating, paint system, use environment, and budget. Sihoobor can recommend a suitable option.

Request a Quote

If you are choosing between PPGI and PPGL steel coil for roofing sheets or wall panels, send us your project information. We can help compare suitable specifications and provide a quotation.