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Types of Coated Steel Coils | PPGI & PPGL
In industries such as construction, home appliances, automotive, and transportation equipment, coated steel coils are widely used due to their corrosion resistance, durability, aesthetics, and excellent processability. Selecting the right type of coated steel coil and coating system is critical to ensuring product performance and service life.
This article provides a detailed overview of the different types of coated steel coils, their substrates, coating materials, performance comparison, and key applications. As a leading manufacturer and supplier, Hengze Steel offers high-quality PPGI, PPGL, and other coated steel coils designed to meet diverse market needs.
Table of Contents
1. Structure of Coated Steel Coils
A coated steel coil typically consists of two main components:
Substrate (Base Steel): Options include cold-rolled steel, hot-rolled steel, galvanized steel (GI), galvalume steel (GL, aluminum-zinc alloy coated steel), and aluminized steel.
Coating / Paint Layer: Usually applied in multiple layers, including primer, top coat, and back coat. These layers provide anti-corrosion protection, UV resistance, decorative color, and extended durability.
2. Common Types of Coated Steel Coils
| Type | Substrate | Coating | Key Features | Typical Applications |
|---|---|---|---|---|
| PPGI (Pre-painted Galvanized Steel Coil) | Galvanized steel (GI) | Organic paint system (primer + top coat) | Good corrosion resistance, excellent adhesion, wide color options, cost-effective | Roofing sheets, wall cladding, home appliance panels, advertising boards |
| PPGL (Pre-painted Galvalume Steel Coil) | Galvalume steel (Al-Zn coated) | Organic paint system | Superior corrosion resistance from Al-Zn layer + decorative finish; ideal for harsh outdoor environments | Roof systems, external wall panels, exposed structures |
| Color Coated Steel Coil (General Term) | CR, HR, GI, GL, stainless steel | Paint systems like PE, SMP, HDP, PVDF | Wide color range, performance varies by coating type; excellent formability | Furniture, ceilings, partitions, doors, decorative panels |
| Galvanized Steel Coil (GI) | Cold-rolled / hot-rolled base + zinc layer | Hot-dip galvanizing / electro-galvanizing | Basic corrosion protection, economical, lower aesthetics | Structural parts, pipes, general industrial applications |
| Aluminized Steel Coil | Steel + Al or Al-Si alloy layer | Metallic coating (aluminum/aluminum-zinc) | High heat resistance, reflective properties, anti-oxidation | Automotive exhausts, ovens, water heater tanks, HVAC systems |
| High Durability Coated Steel Coil | GI/GL + premium paint system | Coatings such as PVDF or HDP | Long-term UV resistance, anti-pollution, color retention, low maintenance | Landmark buildings, coastal facilities, high-end roofing systems |
👉 Hengze Steel specializes in manufacturing PPGI and PPGL steel coils with customized coatings such as PE, SMP, HDP, and PVDF, ensuring both cost-effectiveness and long-term durability.
3. Types of Coating Materials
The performance of a coated steel coil depends heavily on the type of paint system used. Common options include:
Polyester (PE): Cost-effective, wide color range, good flexibility, suitable for general applications.
Silicone Modified Polyester (SMP): Better UV resistance and gloss retention compared to PE.
High Durability Polyester (HDP): Improved weather resistance, suitable for long-term outdoor use.
Polyvinylidene Fluoride (PVDF): Premium performance in UV resistance, chemical resistance, and long-lasting color retention—ideal for high-end projects.
Other Options: Polyurethane (PU), Epoxy (for primer layers), and hybrid systems for enhanced adhesion and corrosion resistance.
Hengze Steel offers tailored coating solutions based on project requirements, ensuring optimal balance between cost and performance.
4. How to Select the Right Coated Steel Coil
When choosing coated steel coils, consider the following factors:
Application Environment – Outdoor or indoor? Coastal or industrial zones? Exposure to UV, salt spray, or acid rain?
Corrosion Resistance – Compare GI vs. GL vs. aluminized steel.
Aesthetics – Gloss level, special patterns (wood grain, metallic, brick designs).
Formability – Will the material undergo bending, stamping, or deep drawing?
Cost Efficiency – Initial cost vs. long-term maintenance savings.
Sustainability & Compliance – VOC-free coatings, recyclability, compliance with international environmental standards.
5. Performance Comparison
| Property | PPGI (PE) | SMP | HDP | PVDF | PPGL (with PVDF) |
|---|---|---|---|---|---|
| Weather Resistance | Medium (5–7 years) | Good (8–10 years) | Excellent (10–12 years) | Outstanding (15–20+ years) | Outstanding |
| Corrosion Resistance | Moderate | Good | Very good | Excellent | Excellent |
| Color Retention | Fair | Good | Very good | Excellent | Excellent |
| Cost | Low | Medium | Medium-high | High | Medium-high |
| Formability | Excellent | Good | Good | Moderate | Good |
6. Case Applications
Construction Roofing and Wall Panels: Hengze Steel’s PPGL coils with PVDF coating provide long-term protection against UV radiation, salt corrosion, and humidity, making them ideal for coastal and industrial projects.
Home Appliances: PPGI with SMP or HDP coatings offers an attractive finish and excellent formability at a reasonable cost.
Outdoor Signage and Infrastructure: For projects exposed to extreme weather, PVDF-coated steel coils from Hengze Steel guarantee superior performance and minimal maintenance.
Conclusion
The choice of coated steel coil type depends on substrate, coating system, environmental exposure, and budget. For general indoor and light outdoor use, PE and SMP-coated coils are cost-effective solutions. For harsh climates and long-term architectural applications, PVDF-coated PPGL steel coils deliver unmatched durability and color stability.
With years of expertise in coated steel manufacturing, Hengze Steel provides premium PPGI, PPGL, and other coated steel coils that meet global standards. Whether you are looking for roofing materials, wall panels, or customized coated steel solutions, Hengze Steel is your reliable partner for high-quality and cost-effective products.
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