Wanzhi Group is a coated steel manufacturer in China. Our Pre-Painted Galvalume Sheet (PPGL sheet) perfectly combines the excellent corrosion and heat resistance of zinc-aluminum coated substrates with the rich color choices, decorative properties, additional weathering and specific functionalities offered by organic coatings in the building envelope, building envelope, appliance manufacturing and industrial equipment.
Pre-Painted Galvalume Sheet Definition
Pre-Painted galvalume sheet is made of aluminized zinc alloy steel sheet (Galvalume) as a substrate (typical composition 55% aluminum, 43.4% zinc, 1.6% silicon), which is subjected to rigorous surface cleaning (degreasing, chemical conversion) and then coated with high-performance organic coatings (polyester, silicone-modified polyester, high weathering polyester, fluorocarbon, etc.) on the front and back side continuously and baked and cured to form a composite material. The composite material is baked and cured.
Key Specifications
| Property | Description |
| Thickness | Common range: 0.3mm – 1.5mm (Common in construction: 0.4mm – 0.8mm). |
| Width | Standard coil width: 600mm – 1250mm, can be customized based on equipment. |
| Coating Weight | Common options: AZ100, AZ150, AZ120. (Higher coating weight provides better corrosion resistance but increases cost.) |
| Substrate Standard | Typically conforms to ASTM A792/A792M, JIS G3321, EN 10346, etc. |
| Coating Types (Front) | Polyester (PE), Silicon-Modified Polyester (SMP/SiPE), High Durability Polyester (HDP), Polyvinylidene Fluoride (PVDF), other functional coatings. |
| Coating Thickness | Front: typically 10μm – 40μm, Back: 5μm – 20μm. Total coating thickness (primer + topcoat). |
| Coating Structure | Chemical conversion layer (Chromated/Chromium-free), primer, topcoat, (optional) back coat. |
| Color & Gloss | Customizable colors according to standard color charts or samples. Wide range of gloss levels (high gloss, semi-gloss, matte). |
| Surface Treatment | Textures (metal texture, leather texture, embossed texture, etc.), patterns (wood grain, brick patterns, floral, grass, sky, etc.). |
Coating
| Coating Type | Description |
| Polyester (PE) | The most common coating for Pre-painted galvalume sheets, economical, with good flexibility and a variety of colors, and medium weather resistance. |
| Silicon-Modified Polyester (SMP / SiPE) | Superior weather resistance, color retention, and durability compared to PE, suitable for harsher environments. |
| High Durability Polyester (HDP) | Performance between PE and PVDF, offering high cost-effectiveness. |
| Polyvinylidene Fluoride (PVDF) | Top-tier weather resistance, excellent color retention (up to 20+ years), resistance to chalking, pollution, and chemicals. |
| Other Functional Coatings | Includes antimicrobial coatings, self-cleaning coatings, thermal insulation coatings, etc. |
Substrate
| Substrate Grade | Yield Strength Rp0.2 (MPa) | Tensile Strength Rm (MPa) | Elongation A80mm (%) | Main Use |
| DX51D+AZ | 140 | 270-420 | 22 | Standard formability requirements |
| DX53D+AZ | 140 | 270-420 | 26 | Excellent formability |
| DX54D+AZ | 140 | 270-350 | 30 | Superior formability (deep drawing) |
| HX300LAD+AZ | 300 | 400 | 18 | High strength, good formability |
| HX420LAD+AZ | 420 | 520 | 14 | Higher strength |
Mechanical properties (Depending on the Substrate)
| Property | Description |
| Yield Strength | Ranges widely from 140 MPa (commercial grade) to 550 MPa or higher (ultra-high-strength steel). |
| Tensile Strength | Typically ranges from 270 MPa to 650+ MPa. |
| Elongation | Measures formability, with commercial grades usually >18%, and higher-strength steels varying based on grade. |
Physical and Chemical Properties
Corrosion Resistance
- Aluminum forms a dense oxide film to resist corrosive media, zinc provides sacrificial anode protection, and the organic coating forms a physical barrier to enhance the corrosion resistance of the pre-painted galvalume.
Heat and High Temperature Resistance
- Aluminized zinc substrates can withstand temperatures up to 315°C for a long period of time. Organic coatings have their upper limit of heat resistance: PE/SMP about 120°C, PVDF about 150°C, PPGL steel weathering class: PVDF > SMP > PE.
Salt Mist Resistance
- GL steel sheet can be used in salt mist test for more than 1000 hours without red rust. Coated GL steel has higher salt spray resistance.
Weatherability and color retention
- The service life of the coating is 8-30 years for different materials.
Formability
- The strength of the galvalume sheet and the flexibility of the coating determine the formability of the sheet. DX51D/DX53D and PE coatings are suitable for most cold bending and roll forming applications. Higher strength steels require larger bend radii or special molds.
Thermal Reflectivity (Cool Roof)
- Light-colored (especially white) coated PPGL sheets with high solar reflectivity (SR) and thermal emittance (Em) significantly lower roof temperatures and reduce building energy consumption.
Advantages of Pre-Painted Galvalume Sheet
Core Application of Pre-Painted Galvalume Sheet
Pre-Painted galvalume sheet is widely used in building envelope systems, interior decoration, roofing, walling, industrial products, transportation and other fields.
- Industrial plants, logistics warehouses, commercial centers, stadiums, airport terminals, agricultural buildings.
- Ridge, gable, flashing and other accessories.
- Ceiling, partition, interior wall panels.
- Household appliances: Refrigerators, freezers, washing machines, air conditioners, water heaters, microwave ovens, hoods, and other shells and internal parts (demanding parts).
- Ventilation ducts (HVAC).
- Industrial doors, garage doors.
- Electrical cabinets, control box housings.
- Lighting housings.
- Shelving, storage systems.
- Trailers, RV interior and exterior panels.
- Billboards, noise barriers, furniture, etc.
- Writing boards, clean rooms.
Pre-Painted Galvalume Sheet vs. Pre Painted Galvanized Steel Sheet
Pre-Painted Galvalume Sheet and Pre Painted Galvanized Steel Sheet are two popular types of Prepainted steel, both of them have the same structure (substrate + coating), the core difference is the metal plating of the substrate:
| Property | Pre Painted Galvalume Sheet (PPGL) | Pre Painted Galvanized Sheet (PPGI) |
| Substrate Coating Composition | 55% Aluminum, 43.4% Zinc, 1.6% Silicon | 99%+ Zinc |
| Core Advantages | Extremely high corrosion resistance, excellent heat resistance | Cost-effective, excellent formability and processability |
| Corrosion Resistance | Very high | Good |
| Heat Resistance | Up to 315°C in the long term | Around 200°C, prone to embrittlement at high temperatures |
| Cut/ Scratch Protection | Al₂O₃ barrier + Zn sacrificial protection | Zn sacrificial protection |
| Appearance (Substrate) | Spangle | Regular spangle or zero spangle |
| Coating Adhesion | Very good | Very good |
| Formability | Commercial grade | Especially deep drawing grade |
| Cost | Higher (substrate cost is high) | Lower (substrate cost is lower) |
| Applications | High-end construction, harsh environments, high-temperature areas, household appliance exteriors | Economical construction, deep-drawn parts requiring high formability |
PPGI PPGL Selection Advice
PPGI PPGL steel has the same structure and similar appearance, but there are significant differences in performance and cost, so what is the best choice when selecting steel for a project?
- Prepainted galvanized steel sheet is the best choice when used in harsh corrosive environments such as coastal, industrial, high humidity, high temperatures (>60°C), and in applications requiring extremely long service life and low maintenance。
- Prepainted galvanized sheet is the best choice for mild corrosive environments, limited budgets, short-term use or temporary construction, and other applications.
Wanzhi Customization Services: Meeting Your Unique Needs
Wanzhi Group offers flexible customization services: options range from substrates, coatings, properties, specifications, packaging, certification support and more. Customization Process: Requirement Communication -> Technical Evaluation and Feasibility Confirmation -> Quotation -> Contract Signing -> Production Scheduling -> Quality Inspection -> Delivery. Our delivery time for Pre-Painted Galvanized Sheet is 5-45 days.
| Custom Category | Optional Items Example |
| Substrate | Special thickness, width, smooth substrate surface; ultra-high-strength substrate; special surface-treated substrates |
| Coating Colors | Exclusive colors, metallic colors, special effects (pearl, iridescent); special coating types; differentiated coating thickness; special back coating |
| Coating Types | PE/SMP/HDP/PU/PVDF, high-thickness PVDF (>25μm), self-cleaning PVDF, antimicrobial coatings, etc. |
| Back Coating | Standard PE back coating, thickened PE back coating, SMP back coating, chromium-free environmentally friendly back coating, etc. |
| Performance Indicators | Specific weather resistance grade, special corrosion resistance, special physical performance requirements |
| Packaging & Transportation | Custom length sheets/coil weight/inner diameter; waterproof, moisture-proof vacuum packaging, reinforced with steel brackets |
Pre-Painted Galvanized Sheet Manufacturer
Wanzhi Group has a professional coated steel production line and our factory is certified by ISO9001, ISO14001, etc. We provide our customers with reliable, beautiful and economical high-performance solutions as well as PPGL coil sheet OEM ODM service. So far, our prepainted sheet has been exported to more than 100 countries and regions around the world, and our factory (Shandong Wanzhi Steel CO,.LTD) also receives visitors from all over the world. If you are planning to request a sample for testing or would like to visit PPGL factory, please feel free to contact us.
Wanzhi Steel – Agricultural Greenhouse Project in Turkmenistan
550 tons PPGI Steel Coil to Azerbaijan
100 tons of Galvanized Coils to Saudi Arabia
144 ton Steel Wire to Spanish
Project of PPGI Roofing en Libya
100 tons of GL and PPGL in Solomon Islands
Frequently Asked Questions (FAQ)
Q: Is there a difference between Pre Painted Galvalume Sheet and Prepainted Galvalume Steel Sheet?
A: There is no fundamental difference. “Pre Painted” and “Prepainted” are different ways of writing the same term. At their core, they both refer to painted galvalume steel sheets.
Q: How long does it last?
A: 10-30 years, which is greatly affected by a number of factors: coating weight (AZ150 > AZ120 > AZ100), coating system (PVDF > SMP > PE), environmental corrosivity (coastal/industrial zones are more severe), quality of installation, maintenance.
Q: Is it really much more expensive than normal color coated sheet (PPGI)? Is it worth it?
A: It is true that the initial cost is higher (mainly due to the aluminium zinc coating substrate). However, in the long run, it is more cost-effective (long life + corrosive/high-temperature performance + low maintenance cost).
Q: Can it be used for roofing? How is the insulation effect?
A: pre-painted galvalume is one of the ideal materials for roofing! Advantages include: lightweight and high strength, corrosion and weather resistance, quick installation, and long life. Insulation is better than GI GL PPGI sheet.
Q: What do I need to pay attention to when installing cuts?
A: It is critical to protect the cuts (avoiding high temperatures that can cause ablation of the coating and damage to the plating); and to dispose of the cuts in a timely manner.
Q: How to choose between different coatings (PE, SMP, PVDF)?
A: Mainly based on weatherability, aesthetic durability and budget:
- Polyester (PE): Suitable for general construction, less demanding color retention requirements and limited budget projects.
- Silicone Modified Polyester (SMP): medium to high end plants, commercial buildings.
- Polyvinylidene Fluoride (PVDF): for high-end landmarks, waterfront buildings, strong UV areas, and projects requiring long warranties.
Q: What is HDP coated PPGL steel sheet? How does it compare to SMP/PVDF?
A: High Durability Polyester (HDP) is a new generation of improved polyester resin.
Q: How does HDP coating compare to SMP/PVDF?
A: HDP coatings are a cost-effective alternative to PE and SMP.
Q: Is the backside coating important?
A: Very important! The backside is also exposed to the environment. Standard backside coatings (PE or epoxy) provide basic protection.
Pre-Painted galvalume sheet has become one of the materials of choice for modern building enclosures/walls/roofs/suspended ceilings, high end appliance manufacturing, and demanding industrial applications due to its unmatched corrosion resistance, superior heat resistance, long-lasting decorative qualities, and good processability. Contact us for a free quote and solution now!