Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of Pre Painted Galvanized Steel Coil Manufacturer | PPGI Coil Supplier & Exporter in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
What Is Pre Painted Galvanized Steel Coil?
Pre Painted Galvanized Steel Coil (PPGI Coil) is a color-coated steel product manufactured by applying organic paint coatings onto hot-dip galvanized steel substrates through a continuous coil coating process. The galvanized zinc layer provides corrosion protection while the paint system offers additional weather resistance, UV stability, and decorative appearance.
Compared with conventional galvanized steel coils, PPGI coils provide enhanced durability, wider color options, improved aesthetics, and reduced maintenance costs. They are extensively used in roofing systems, wall cladding, household appliances, HVAC equipment, agricultural buildings, and industrial structures.
Pre-painted Galvanized Steel coils, namely color-coated galvanized steel coils, play a crucial role in numerous industries. It is made by coating one or more layers of organic paint on the surface of galvanized steel sheet and then baking and curing it. It combines the strength of galvanized steel sheet with the beauty and protective performance of organic paint.
Product features
Outstanding corrosion resistance:
The galvanized layer serves as the first layer of protection, effectively preventing the steel from coming into contact with corrosive media from the outside. The organic coating further enhances the protective effect, preventing moisture, oxygen and other substances from eroding the steel, significantly extending the service life of the product. Compared with ordinary galvanized steel plates, it has more advantages.
Outstanding decorative effect:
It offers a rich variety of color options, such as common colors like gray and white, sea blue, brick red, etc. It can also be customized according to the RAL color card to meet the personalized needs of different projects. The surface of the coating can present various effects such as gloss, matte or texture, providing beautiful decorative options for fields like architecture and furniture.
Excellent processing performance:
It not only possesses the mechanical strength and easy formability of steel, but also, due to the presence of organic coatings, is less likely to encounter problems such as coating peeling and cracking during processing. It can undergo various processing operations such as bending, stamping, and cutting, facilitating the production and manufacturing of various products.
Outstanding cost performance:
While ensuring long-term durability, its cost is relatively reasonable, providing high-performance and cost-effective material solutions for numerous enterprises, and is widely used in various fields.
Specification parameters
► Thickness range: Generally between 0.2mm and 1.2mm. Different thicknesses can be customized according to customer requirements.
► Width range: Commonly 600mm to 1250mm, and custom special widths are also supported.
► The weight of the zinc coating ranges from 60g/m² to 275g/m². The thicker the zinc coating, the stronger the corrosion resistance. The appropriate weight of the zinc coating can be selected according to the usage environment.
► Coating systems: including polyester (PE), silicon-modified polyester (SMP), polyvinylidene fluoride (PVDF), etc. PE has a relatively low cost and features good flexibility and adhesion. The weather resistance and color stability of SMP are superior to those of PE. PVDF features excellent corrosion resistance and an extremely long service life, making it suitable for high-end projects.
► The thickness of the coating: The thickness of the topcoat on the front side is usually 10 to 30 microns, and that of the backcoat is 5 to 25 microns. A reasonable distribution of coating thickness can ensure the protective performance and appearance quality of the product.
► Surface treatment: There are methods such as common chemical pretreatment and chromium-free chemical pretreatment to enhance the adhesion between the coating and the substrate and improve the comprehensive performance of the product.
Coating System Selection Guide
One of the biggest shortcomings of competitor pages is the lack of coating selection guidance.
| Coating Type | Service Life | Application |
|---|---|---|
| PE | 8-10 Years | General Roofing |
| SMP | 10-15 Years | Industrial Buildings |
| HDP | 15-20 Years | High UV Areas |
| PVDF | 20-30 Years | Coastal & Landmark Projects |
PVDF coatings offer the highest UV resistance and color stability, while PE coatings provide the most economical solution for general construction projects
Zinc Coating Options
| Zinc Coating | Corrosion Protection |
|---|---|
| Z40 | Indoor Applications |
| Z60 | Dry Climate Areas |
| Z80 | Standard Construction |
| Z120 | Commercial Buildings |
| Z180 | Industrial Environment |
| Z275 | Severe Corrosion Areas |
Product Features
Exceptional Corrosion Resistance
The galvanized layer on the steel coil acts as a sacrificial barrier. Zinc, being more reactive than iron in the steel, corrodes first when exposed to moisture and oxygen. This sacrificial protection significantly extends the lifespan of the steel coil. According to research from the International Zinc Association, galvanized steel can last up to 50 years in moderate environments. The pre - painted coating further enhances this protection. It forms a physical barrier, preventing corrosive agents from reaching the steel surface. For example, in coastal areas where salt - laden air can accelerate corrosion, Pre Painted Galvanized Steel Coils with a proper paint system can withstand the harsh conditions for many years.
Rich Aesthetic Options
One of the most appealing aspects of Pre Painted Galvanized Steel Coil is its wide range of color choices. Manufacturers offer colors that match popular design trends, from classic neutrals like white and gray to bold and vibrant hues such as red and blue. Additionally, the paint finish can be customized to achieve different textures, such as smooth, matte, or textured. This versatility allows architects and designers to use it in a variety of projects, from modern commercial buildings to traditional residential homes.
Superior Workability
Despite the paint coating, this steel coil retains the excellent workability of galvanized steel. It can be easily cut, bent, and formed into various shapes using standard metalworking tools and techniques. Whether it's being used to create roofing panels, wall cladding, or furniture components, the Pre Painted Galvanized Steel Coil can be processed without causing damage to the paint layer. This property not only saves time during the manufacturing process but also reduces waste.
Cost - effectiveness
When considering the long - term costs, Pre Painted Galvanized Steel Coil offers great value. Its corrosion resistance means less frequent replacement and maintenance, which can save significant amounts of money over the lifespan of a project. Compared to other building materials that require regular painting or have a shorter lifespan, the initial investment in Pre Painted Galvanized Steel Coil pays off in the long run.
Application Areas
Construction Industry
In construction, Pre Painted Galvanized Steel Coil is used for roofing, wall cladding, and partitions. Its light weight makes it easy to handle and install, reducing labor costs. For example, in large - scale industrial buildings, the use of Pre Painted Galvanized Steel Coil for roofing can provide a durable and aesthetically pleasing solution. The corrosion resistance ensures that the building is protected from the elements for years to come.
Home Appliance Manufacturing
Many home appliances, such as refrigerators, washing machines, and air conditioners, use Pre Painted Galvanized Steel Coil for their outer casings. The paint coating not only provides an attractive finish but also protects the steel from scratches and corrosion, which is important in a household environment.
Furniture Making
Furniture manufacturers use this steel coil to create stylish and durable furniture pieces. The ability to choose from different colors and finishes allows for the creation of furniture that matches various interior design themes. For example, steel desks and chairs with a pre - painted finish can be both functional and decorative.
Transportation Sector
In the transportation industry, Pre Painted Galvanized Steel Coil is used in the production of truck bodies, trailers, and parts of train carriages. Its lightweight and corrosion - resistant properties are crucial for reducing the weight of vehicles, which in turn improves fuel efficiency.
Production Process
Galvanization
The first step in producing Pre Painted Galvanized Steel Coil is galvanizing the steel. This is typically done through hot - dip galvanization, where the steel coil is immersed in a bath of molten zinc. The zinc adheres to the steel surface, forming a thick and uniform zinc layer. The thickness of the zinc layer can be adjusted according to the intended application. For more corrosive environments, a thicker zinc layer is applied.
Surface Pretreatment
After galvanization, the steel coil undergoes surface pretreatment. This involves cleaning the surface to remove any impurities, followed by the application of a chemical primer. The primer helps to improve the adhesion of the paint coating to the galvanized surface.
Painting
The final step is painting the pretreated steel coil. High - quality paint is applied using specialized coating equipment. The paint is cured through a baking process, which ensures a hard and durable finish. Different types of paint, such as polyester, silicon - modified polyester, and polyvinylidene fluoride (PVDF), can be used depending on the required level of durability and performance.
Corrosion Resistance Analysis
The corrosion resistance of PPGI coils depends on:
Zinc Coating Weight
Higher zinc coating provides longer sacrificial protection.
Paint System
Multi-layer coating structures prevent moisture penetration.
Environmental Conditions
Rural Areas
Urban Areas
Industrial Areas
Marine Environments
Properly selected PPGI systems can achieve service lives from 10 to over 30 years depending on coating type and exposure conditions.
Formability & Fabrication Performance
PPGI coils exhibit excellent processing characteristics:
Roll Forming
Bending
Profiling
Stamping
Slitting
Cut-to-Length
The paint layer maintains adhesion during fabrication when appropriate bend radii are applied.
Inspection & Quality Assurance
Every coil undergoes:
✔ Thickness Inspection
✔ Paint Thickness Testing
✔ Gloss Measurement
✔ Color Difference Testing
✔ Zinc Coating Testing
✔ T-Bend Testing
✔ Impact Resistance Testing
✔ Salt Spray Testing
✔ Third Party Inspection Available
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
FAQ
What is the difference between PPGI and galvanized steel?
PPGI includes additional paint coatings over galvanized steel, providing enhanced aesthetics and corrosion protection.
Which coating is best for coastal areas?
PVDF coating combined with Z275 zinc coating is recommended.
What colors are available?
All RAL colors can be supplied.
What zinc coating should I choose?
Z120-Z180 for general construction, Z275 for harsh environments.
Can you provide customized widths?
Yes. Customized slit coil service is available.
Do you provide sample coils?
Yes. Free samples can be arranged.
Can you provide MTC EN10204 3.1?
Yes.
Do you support third-party inspection?
Yes. SGS, BV, TUV and other inspections are accepted.
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