GI and PPGI are the two most common products in the coated flat steel family. Both start from the same base: GI galvanized sheet is also the substrate of PPGI.
GI galvanized coil
GI (Galvanized Iron) is steel sheet zinc coated by hot-dip galvanizing. The zinc layer protects the steel against corrosion. The surface is silver and often shows a spangle pattern.
- Standard: EN 10346
- Common grade: DX51D+Z
- Typical uses: drywall profiles, ventilation ducts, trapezoidal sheets
PPGI pre-painted coil
PPGI (Pre-Painted Galvanized Iron) is made by applying a primer and topcoat to galvanized sheet in the factory. The paint adds both appearance and extra protection.
- Standard: EN 10169 (coating), EN 10346 (substrate)
- Colours: RAL range
- Typical uses: trapezoidal and corrugated roofing, ridge capping, sandwich panels, cladding
Which one to choose?
If the surface stays visible and colour matters (roofs, façades, panels), choose PPGI; for profiles, ducts or internal structural parts, choose GI. For load-bearing profiles that are cut and punched and must last outdoors, consider Magnelis.
When ordering
Specifying thickness, coil width, grade (e.g. DX51D+Z), coating and, for PPGI, the RAL colour code helps you get an accurate quote.