PPGI vs PPGL Color Coated Steel: Grades, Paint Systems & Applications for 2026 Projects

Created on 10.02
Color coated steel (also called pre-painted steel) is one of the most widely used metal building and manufacturing materials, valued for its aesthetic versatility, corrosion resistance and low maintenance. For buyers selecting the right product for roofing, cladding, appliance shells or industrial panels, understanding the difference between PPGI and PPGL — and matching the paint system to the application — is critical for long-term performance and cost efficiency.
PPGI and PPGL color coated steel coils stacked in warehouse for roofing and cladding applications

PPGI vs PPGL: what’s the difference?

The core difference lies in the base metal substrate under the paint:
PPGI (Pre-painted Galvanized Steel): Uses hot-dip galvanized steel as the substrate, with a pure zinc corrosion layer. It is the most common and cost-effective color coated steel option.
  • Best for: indoor applications, mild outdoor environments, general construction, home appliance shells.
  • Typical zinc coating: Z40–Z275 g/m².
PPGL (Pre-painted Galvalume Steel): Uses 55% aluminum-zinc alloy coated steel as the substrate, combining the corrosion protection of aluminum and the sacrificial protection of zinc.
  • Best for: outdoor roofing, wall cladding, harsh sun exposure, coastal and industrial areas.
  • Typical Al-Zn coating: AZ30–AZ185 g/m².
  • Advantage: 2–3 times the corrosion resistance of PPGI in equivalent coating weight, with better heat resistance and thermal reflectivity.
Cross-section comparison of PPGI galvanized coating versus PPGL aluminium-zinc alloy coated steel

Paint system options: match performance to environment

We offer four main paint systems, each engineered for different durability requirements and application scenarios:
Paint Type
Full Name
Typical Service Life
Key Features
Primary Applications
PE
Polyester
1–5 years
Good adhesion, wide color choice, cost-effective
Indoor panels, home appliances, temporary buildings
SMP
Silicon Modified Polyester
10–15 years
Good hardness, heat resistance, gloss retention
General roofing, wall cladding, factory buildings
HDP
High Durability Polyester
10–12 years
Excellent UV resistance, weatherability
Outdoor construction, high-sun exposure areas
PVDF
Polyvinylidene Fluoride
20–25 years
Superior weather resistance, color stability, chemical resistance
High-end buildings, coastal projects, industrial facilities
Paint systems applied to color coated steel roofing, wall cladding, appliance shells and agricultural buildings

Full specification range

CNB New Material’s color coated steel portfolio covers comprehensive specifications to meet diverse project needs:
Thickness: 0.1–2.0mm
Width: 900–1650mm
Coil ID: 508/610mm
Grades: DX51D – DX57D; S220GD – S550GD
Surface finishes: Single color, pattern, embossed, suede, grid, wrinkled, self-cleaning, anti-bacterial, anti-static, thermal insulated.

Common applications by product type

Commercial & industrial construction: PPGI PE for interior walls and ceilings; PPGL SMP/HDP for roofing and exterior cladding.
Home appliances: PPGI with smooth surface for refrigerator panels, washing machine shells and air conditioner housings.
Agricultural buildings: PPGL with anti-corrosion substrate for farm sheds, greenhouses and storage facilities.
Transportation & infrastructure: PVDF coated PPGL for highway noise barriers, station facades and tunnel decoration.
Food & medical: Food-grade and anti-bacterial PPGI/PPGL for clean rooms, food processing lines and medical facility panels.
Why source color coated steel from CNB New Material
Thicker paint film: Standard 5+10/5μm coating, vs. industry average 8–10/3–4μm, for longer service life.
Premium paint brands: Akzo Nobel, Nippon, PPG and other global top paint suppliers for consistent quality.
Massive ready stock: 20,000 tons of daily PPGI/PPGL stock for fast shipment.
Custom solutions: Custom colors, sizes, surface treatments and fabrication services to match exact project requirements.
Full export documentation: MTC, SGS, RoHS and CBAM compliance documents provided for every order.
Whether you need standard roofing panels or custom color coated steel for specialized applications, CNB New Material delivers reliable quality and competitive pricing.
👉 Request a free sample swatch or get a detailed technical quotation for your color coated steel project.
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