Z120 PPGI (Prepainted Galvanized Steel Coil with 120 g/m² Zinc Coating)
1. Product Overview
Z120 PPGI (Prepainted Galvanized Iron) refers to galvanized steel coils coated with 120 g/m² of zinc (total for both sides) and subsequently painted with high-performance organic coatings. This product combines the corrosion protection of zinc with the decorative and functional benefits of color coating, offering superior durability, excellent appearance, and weather resistance. Z120 is a popular coating weight for moderate outdoor exposure environments-balancing protection, weight, and cost efficiency-making it a top choice for construction, automotive, and appliance industries worldwide.
2. Base Material & Coating
Cold-rolled steel sheet (CR full hard or soft annealed)
Z120 (120 g/m² total - typically ~60 g/m² per side)
Hot-dip galvanized, per ASTM A653, JIS G 3312EN 10346
Chromated or chromate-free passivation, oiling or dry finish
2/1, 2/2, or customized (primer + top + back coat)
3. Technical Specifications
| 0.12 mm – 1.2 mm | ||
| 600 mm – 1250 mm | Tolerance ± 2 mm | |
| Z120 (120 g/m²) | ||
| Top: 15–25 μm | Back: 5–10 μm | |
| 508 mm / 610 mm | ||
| 3 – 8 MT | ||
| ASTM A755, EN 10169, JIS G 3312 |
4. Key Features & Advantages
The Z120 zinc layer provides strong barrier and cathodic protection, ideal for general outdoor exposure.
Uniform color coating, smooth surface, and customizable finishes (glossy, matte, metallic, textured).
Multi-layer pre-treatment and oven-curing process ensure coating durability under mechanical stress.
Maintains flexibility for roll forming, bending, or punching without flaking.
Durable topcoats (especially PVDF/SMP) ensure long-term color retention and gloss stability.
Eco-Friendly Options: Chromate-free passivation and solvent-free coating systems available on request.
Medium zinc mass (Z120) optimizes cost vs. performance for medium-duty environments.
5. Color & Surface Options
RAL 5015 (Blue), RAL 9003 (White), RAL 3020 (Red), RAL 6005 (Green), RAL 7016 (Gray) - custom shades available.
Smooth, embossed, wrinkled, or matte.
Metallic silver, woodgrain, marble, camouflage, or printed patterns.
Color matching available based on RAL, Pantone, or sample swatches.
6. Applications
Z120 PPGI coils are widely used where corrosion protection and decorative finishes are needed:
Roofing sheets, wall cladding, sandwich panels, garage doors, ceiling boards, window frames.
Refrigerator panels, washing machine casings, microwave housings.
Vehicle body panels, truck boxes, railway coaches, and bus shelters.
Lighting fixtures, partition panels, decorative ceilings.
Storage sheds, poultry houses, and greenhouses.
7. Quality Control & Certification
ISO 9001, ISO 14001OHSAS 18001 certified systems.
Coating thickness, adhesion (T-bend, impact test), gloss, color deviation, corrosion resistance (salt-spray > 500 hrs).
Provided with each batch showing base steel grade, coating mass, and test results.
Film hardness, pencil hardness, solvent resistance, and accelerated weathering (QUV).
8. Packaging & Logistics
Inner coil ID: 508 mm / 610 mm.
Wrapped with waterproof kraft paper and galvanized steel sheet; secured with steel straps and edge protectors.
Export seaworthy packaging suitable for long-distance transportation.
Coil marking includes: grade, color, coating type, net weight, coil number, production date, and supplier logo.
9. Why Choose Z120 PPGI
for general outdoor use.
- easy substitution with Z100–Z275 grades.
for architectural, decorative, and industrial projects.
for roll forming, corrugating, and press bending.
Environmentally responsible coatings available (lead- and chromate-free).
10. Order Guide
Thickness, width, and coil weight.
Zinc coating mass (Z120 or alternatives).
Paint type and color (RAL or sample).
Coating structure (2/1, 2/2, etc.).
Base metal grade (DX51D, SGCC, ASTM A653 CS-B, etc.).
Surface finish and packaging requirements.
Intended application or environment (roofing, appliance, automotive, etc.).
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