Prepainted Galvalume Steel Coil - PPGL Color Coated GL
PPGL prepainted Galvalume steel coil — the highest-durability painted steel product available. 55% Al-Zn (GL) substrate provides 2-4× better corrosion resistance than GI substrate, combined with factory-applied PE/SMP/HDP/PVDF topcoat. Maximum service life for premium roofing, coastal construction, marine environments and projects requiring 25+ year color performance. RAL and custom colors available.
| Product | Prepainted Galvalume Steel Coil / PPGL |
| Paint System | PE / SMP / HDP / PVDF |
| Substrate | Galvalume (GL, AZ50-AZ185, 55% Al-Zn) |
| Thickness | 0.12 – 1.2 mm |
| Width | 600 – 1250 mm |
| Top Paint | 15-25μm (PE/SMP/HDP/PVDF) |
| Back Paint | 5-10μm Epoxy Primer |
| Colors | RAL, Pantone, custom color or pattern |
| Standard | ASTM A755, EN 10169, JIS G3322 |
Color Coated AL-ZN — Ultimate Corrosion Resistance — Premium Roofing & Exterior
What Is Prepainted Galvalume Steel Coil?
Prepainted Galvalume steel coil (PPGL) is the highest-durability painted steel product available. It combines the superior corrosion resistance of Galvalume (55% Al-Zn) substrate with factory-applied color paint coatings, delivering maximum service life for demanding exterior applications.
PPGL outperforms PPGI (GI substrate) in corrosion resistance by 2-4× because the underlying Galvalume coating provides dramatically better atmospheric corrosion protection than pure zinc. This means the paint system is supported by a more durable foundation, resulting in longer overall product life even if the paint is damaged.
For premium roofing, coastal construction, marine environments and projects requiring 25+ year color performance, PPGL is the recommended specification by steel industry experts worldwide.
Technical Specifications
Available in various thicknesses, widths and coating options. Common standards include ASTM, JIS, EN and GB/T. Different industries may choose different specifications depending on service life, corrosion requirements and fabrication method.
| Product | Prepainted Galvalume Steel Coil / PPGL |
|---|---|
| Paint System | PE / SMP / HDP / PVDF |
| Substrate | Galvalume (GL, AZ50-AZ185, 55% Al-Zn) |
| Thickness | 0.12 – 1.2 mm |
| Width | 600 – 1250 mm |
| Top Paint | 15-25μm (PE/SMP/HDP/PVDF) |
| Back Paint | 5-10μm Epoxy Primer |
| Colors | RAL, Pantone, custom color or pattern |
| Standard | ASTM A755, EN 10169, JIS G3322 |
Contact our technical team for specific grade and coating recommendations based on your application environment and processing requirements.
Applications
Thanks to its corrosion resistance, processing flexibility and cost-performance ratio, this product is widely used across construction, manufacturing and industrial sectors.
🏗️ Premium Roofing
High-end residential and commercial roofing. PPGL combines color coating with GL substrate for 25+ year service life in harsh environments.
☀️ Solar & Heat Zone
Solar carports, desert projects, heat-exposed facades. Al-Zn substrate resists heat to 315°C vs 230°C for GI substrate.
🏭 Industrial & Marine
Coastal factories, chemical plants, food processing, livestock facilities. Superior corrosion resistance in aggressive environments.
🎨 Architectural Design
Wood-grain, stone-pattern, custom prints for decorative panels, signage, and architectural accents with UV-resistant coatings.
PPGL vs PPGI
PPGL and PPGI are both color coated steel. The key difference is substrate: PPGL uses Galvalume (Al-Zn), PPGI uses galvanized (zinc).
PPGL (GL Substrate)
Premium color coated solution with superior substrate corrosion resistance for maximum service life.
PPGI (GI Substrate)
Cost-effective color solution with broad market availability for general applications.
| Comparison Item | PPGL (GL Substrate) | PPGI (GI Substrate) |
|---|---|---|
| Substrate | GL (55% Al-Zn) | GI (Zinc) |
| Substrate Corrosion | 2-4× better than GI | Standard zinc protection |
| Service Life | 30-50% longer | Standard |
| Heat Resistance | GL substrate 315°C | GI substrate 230°C |
| Cost | 5-10% higher | More economical |
| Best For | Premium roofing, marine, harsh exterior | Interior, light exterior, appliances |
Main Advantages
This product combines durability, processing flexibility and cost-effectiveness for a wide range of applications.
- Longest painted steel life — GL substrate + paint = maximum service life among all color coated steel products
- Superior substrate corrosion — 55% Al-Zn substrate provides 2-4× better corrosion resistance than GI substrate
- Heat resistant substrate — GL substrate withstands 315°C vs 230°C for GI — ideal for hot climate roofing
- Premium aesthetic durability — Paint retains color and gloss longer on GL substrate due to superior underlying corrosion protection
- Pattern print available — Wood-grain, marble, stone and custom pattern printing on GL substrate for architectural applications
- 25+ year warranty available — PVDF on GL substrate can achieve 25-30+ year paint performance warranty in normal environments
Why Choose SunSea Steel?
Choosing the right supplier means more than buying steel. It also means stable quality, export experience, efficient communication and reliable delivery support.
Stable Product Quality
Uniform coating mass, reliable base steel quality and stable surface condition help ensure consistent performance in export orders.
Custom Specification Support
Thickness, width, coating mass, steel grade, surface treatment and packing can be customized according to project requirements.
Professional Export Service
Support for packing, loading, shipping documents and delivery coordination helps customers manage international orders more efficiently.
Fast Response and Quotation
Buyers can quickly get specification confirmation, technical support and quotation feedback for distribution, project procurement and manufacturing use.
Factory Strength and Production Capability
Our production system focuses on coating uniformity, thickness control, clean surface quality and export-standard packing. From raw material selection to final inspection and shipment preparation, every stage is managed to improve product consistency and reduce customer risk.
For buyers, factory capability means more than output volume. It also means communication efficiency, documentation support, shipment coordination and the ability to provide stable product supply over time.
- Stable production planning for export orders
- Support for customized sizes and coating requirements
- Professional handling of packing and shipment preparation
- Inspection and tolerance control before delivery
Quality Control and Inspection
Product quality is one of the key concerns for overseas buyers. Quality should be controlled not only by final visual inspection, but also by process stability, specification verification and export packing inspection.
Surface and Dimension Inspection
Surface condition, width, edge quality and dimensional tolerance are checked before delivery.
Pre-Shipment Quality Control
Packing condition, identification, quantity confirmation and shipment readiness are reviewed before export.
Thickness and Width Verification
Thickness tolerance, width and coil dimensions are checked to ensure the material is suitable for roll forming, profiling and project processing needs.
Coating and Surface Checking
Coating weight requirements and surface appearance are reviewed before packing and shipment.
Packing Inspection
Export packing is examined to ensure moisture-proof protection, steel straps and edge protectors are correctly applied.
Shipment Preparation
Quantity, identification, loading readiness and related documentation are confirmed before export delivery.
Standard Export Seaworthy Packaging
For steel export, correct packaging is extremely important. Even high-quality product can suffer surface damage, moisture exposure or edge deformation if packing is not suitable for sea shipment.
- Inner Moisture Protection: Waterproof kraft paper and plastic film help reduce moisture contact.
- Outer Steel Cover: Additional outer steel sheet gives stronger protection during handling.
- Edge Protection: Edge protectors reduce impact damage during lifting and stacking.
- Steel Strapping: Radial and circumferential straps help keep the coil stable.
- Pallet Support: Wooden or steel pallets can be used according to shipping requirements.
Shipping, Loading and Delivery Solutions
Shipping method depends on order quantity, coil size and destination requirements. Container shipment and break bulk vessel are the most common methods for steel coil export.
Container Shipment
Suitable for regular export orders. Coils packed on pallets and loaded into containers for safe sea transport. FOB/CIF/CFR available.
Break Bulk Vessel Shipment
For large volume orders or oversized coils. Professional lifting, lashing and port handling for bulk steel procurement.
Small to medium orders: container shipment is preferred. Large-scale or project orders: break bulk vessel may be more efficient.
Frequently Asked Questions
What is PPGL?
PPGL (Prepainted Galvalume) is Galvalume (55% Al-Zn) steel coated with primer and paint. It combines the superior corrosion resistance of GL substrate with color coating for the longest service life among all painted steel products.
PPGI vs PPGL — which is better?
PPGL uses GL substrate with 2-4× better corrosion resistance. PPGL costs 5-10% more but lasts 30-50% longer. PPGL for premium exterior; PPGI for economy interior.
Which paint system for roofing?
HDP or PVDF for premium roofing (20-30+ years). SMP for standard commercial (15-20 years). PE for interior and economy (10-15 years).
What is the MOQ?
25 MT per color/specification. Mixed containers: 5 MT/color minimum with 25 MT total.
Can you match custom colors?
Yes. RAL, Pantone and custom color matching to ΔE ≤ 1.5. Wood-grain and stone-pattern prints also available.
Looking for Premium PPGL Color Coated Steel?
Contact us for PPGL pricing, color options, paint systems and export solutions. Premium quality, factory direct.
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