Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of prepainted metal coil 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.
Products Description
Prepainted Metal Coil, also known as PPGI (Prepainted Galvanized Iron) or PPGL (Prepainted Galvalume Steel Coil), is a high-quality metal coil coated with paint on galvanized or Galvalume steel. The prepainted layer provides excellent corrosion resistance, UV protection, and decorative appearance, making it ideal for roofing, wall cladding, appliances, and industrial applications.
Manufactured according to international standards such as ASTM, JIS, EN, and GB/T, our prepainted metal coils feature single-side or double-side coatings, customizable colors, coating thicknesses, steel gauges, and coil dimensions. With advanced coil coating technology, these coils ensure long-lasting durability, smooth surface, and excellent formability.
Main Keywords: Prepainted Metal Coil, PPGI Coil, PPGL Coil, Color Coated Steel Coil, Prepainted Galvanized Coil, PPGI / PPGL Manufacturer, Color Coated Steel Supplier
Prepainted Metal Coil
Prepainted Metal Coil, also known as pre-coated metal coil, is a product in which an organic coating is pre-applied to the surface of metal coil materials. This product perfectly combines the strength of metals with the protective and decorative properties of coatings, and is widely used in many industries.
Product Specifications
| Property | Specification |
|---|---|
| Base Material | Hot-Dip Galvanized Steel (GI), Galvalume Steel (GL), Cold-Rolled Steel (CR) |
| Coating Type | Single-Side / Double-Side |
| Coating Material | PE, SMP, PVDF, HDP, Polyester |
| Coating Thickness | 15 – 35 μm (Front), 5 – 20 μm (Back) |
| Base Steel Thickness | 0.15 – 1.2 mm |
| Width | 600 – 1250 mm (customizable) |
| Inner Diameter of Coil | 508 mm standard, 610 mm optional |
| Coil Weight | 3 – 8 tons per coil |
| Surface Finish | Smooth, Matte, Stucco Embossed, Stone Coated |
| Standards | ASTM, JIS G3312, EN10169, GB/T2518 |
| Packaging | Plastic-wrapped, waterproof paper, steel straps for export |
Chemical Composition (Typical %)
| Grade | C (max) | Mn (max) | P (max) | S (max) |
|---|---|---|---|---|
| DC01 / Q195 | 0.12 | 0.50 | 0.04 | 0.04 |
| DC03 / Q235 | 0.22 | 1.40 | 0.05 | 0.05 |
| DC04 / Q345 | 0.20 | 1.60 | 0.035 | 0.035 |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| DC01 / Q195 | ≥195 | ≥315 | ≥33 |
| DC03 / Q235 | ≥235 | ≥375 | ≥26 |
| DC04 / Q345 | ≥345 | ≥470 | ≥21 |
Prepainted Metal Coil – International Standard Size Chart
| Base Steel Thickness (mm) | Coating Thickness (μm) | Coil Width (mm) | Coil ID (mm) | Coil Weight (tons) | Approx. Length (m) |
|---|---|---|---|---|---|
| 0.15 – 0.30 | 15 – 25 | 600 – 1000 | 508 (20") | 3 – 5 | 150 – 500 |
| 0.30 – 0.50 | 20 – 35 | 600 – 1250 | 508 / 610 | 3 – 6 | 120 – 400 |
| 0.50 – 0.80 | 25 – 35 | 800 – 1250 | 508 / 610 | 4 – 7 | 100 – 350 |
| 0.80 – 1.00 | 30 – 35 | 1000 – 1250 | 508 / 610 | 5 – 8 | 80 – 300 |
| 1.00 – 1.20 | 30 – 35 | 1000 – 1250 | 508 / 610 | 6 – 8 | 70 – 250 |
Notes:
Coil ID: Standard inner diameter is 508 mm (20"), optional 610 mm for large orders or export containers.
Width: Can be customized according to project requirements (roofing, cladding, appliances).
Coating Thickness: Refers to paint layer thickness, both single-side and double-side coatings are available.
Base Steel: Can be cold-rolled (CR), galvanized (GI), or Galvalume (GL) depending on corrosion resistance needs.
Coil Weight & Length: Approximate values, fully customizable to meet shipping and project requirements.
Product advantages
Outstanding corrosion resistance
With galvanized or aluminized zinc steel plates as the base material, it inherently possesses excellent anti-rust performance. In addition, the organic coating on the surface forms a double protection, which can effectively resist the erosion of harsh environments such as moisture, acids and alkalis, and greatly extend the service life of the product. For instance, in coastal areas or regions with severe industrial pollution, Prepainted Metal coils can remain rust-free and corrosion-free for a long time.
01
Rich colors and aesthetic appeal
It offers up to over 200 RAL standard colors and can achieve effects such as wood grain imitation, stone grain imitation, and metal brushed finish, meeting the personalized demands of different architectural styles and product designs. Whether it is a modern minimalist architectural style or a retro-style decoration, suitable Prepainted Metal coils can be found to match it.
02
Excellent processing performance
After the coating is applied, the metal coil still maintains good plasticity and can undergo various processing operations such as bending, cutting, and stamping. Moreover, the coating is not prone to peeling off or cracking, which can meet the manufacturing requirements of complex-shaped products. Such as making irregular-shaped roofs for construction and decorative shaped panels, etc.
03
Environmental protection and energy conservation
Utilizing recyclable materials, some products undergo chromium-free passivation processes during production, meeting global green building certification standards such as LEED and BREEAM. Meanwhile, it is relatively light in weight, which can reduce energy consumption during transportation and installation.
04
Easy installation
The product specifications are uniform, the quality is stable, and it is easy to operate during installation, which can effectively shorten the construction period and reduce labor costs. In large-scale construction projects, it can significantly improve construction efficiency.
05
Coil coating
Coil coating
is the continuous and highly automated industrial process for efficiently coating metal coils. Because the metal is treated before it is cut and formed, the entire surface is cleaned and treated, providing tightly-bonded finishes. (Formed parts can have many holes, recessed areas, valleys, and hidden areas that make it difficult to clean and uniformly paint.) Coil-coated metal (often called prepainted metal) is often considered more durable and more corrosion-resistant than most post painted metal.
Annually, 4.5 million tons of coil-coated steel and aluminum are produced and shipped in North America, and 5 million tons in Europe.
Process
The definition of a coil coating process according to EN 10169:2010 is a 'process in which an (organic) coating material is applied on rolled metal strip in a continuous process which includes cleaning, if necessary, and chemical pre-treatment of the metal surface and either one-side or two-side, single or multiple application of (liquid) paints or coating powders which are subsequently cured or/and laminating with permanent plastic films.
The metal substrate (steel or aluminum) is delivered in coil form from the rolling mills. Coil weights vary from 5-6 tons for aluminum and up to about 25 tons for steel. The coil is positioned at the beginning of the line, then unwound at a constant speed, passing through the various pre-treatment and coating processes before being recoiled. Two strip accumulators at the beginning and the end of the line enable the work to be continuous, allowing new coils to be added (and finished coils removed) by a metal stitching process without slowing down or stopping the line.
The coil coating line
The continuous process of applying up to three separate coating layers onto one or both sides of a metal strip substrate occurs on a coil coating line. These lines vary greatly in size, with widths from 18 to 60 inches (46 to 152 cm) and speeds from 100 to 700 feet per minute (0.5 to 3.6 m/s); however, all coil-coating lines share the same basic process steps.
A typical organic coil coating line consists of decoilers, entry strip accumulator, cleaning, chemical pretreatment, primer coat application, curing, final coat application, curing, exit accumulator and recoilers.
The following steps take place on a modern coating line:
● Mechanical stitching of the strip to its predecessor
● Cleaning the strip
● Power brushing
● Surface treatment by chemical conversion
● Drying the strip
● Application of primer on one or both sides
● Passage through the first curing oven (between 15 and 60 seconds)
● Cooling the strip
● Coating the finish on one or both sides
● Passage through the second curing oven (between 15 and 60 seconds)
● Cooling down to room temperature
● Rewinding of the coated coil
Applications
Prepainted metal is used in a variety of products. It can be formed for many different applications, including those with T bends, without loss of coating quality. Major industries use prepainted metal in products such as building panels, metal roofs wall panels, garage doors, office furniture (desks, cubicle divider panels, file cabinets, and modular cabinets), home appliances (refrigerators, dishwashers, freezers, range hoods, microwave ovens, and washers and dryers), heating and air-conditioning outer panels and ductwork, commercial appliances, vending machines, foodservice equipment and cooking tins, beverage cans, and automotive panels and parts (fuel tanks, body panels, bumpers), The list continues to grow, with new industries making the switch from post-painted to prepainted processes each year.
Roofing and wall materials in the construction industry: As roofing and wall materials, they possess properties such as waterproofing, windproofing, and heat insulation. Meanwhile, their aesthetically pleasing appearance can enhance the overall image of the building. It is commonly used in industrial plants, commercial buildings, civil residences, etc. For example, many modern industrial park factories adopt Prepainted Metal Coil as roofing and wall materials, which are both economical and practical as well as elegant and stylish.
Architectural decoration: It can be made into various decorative panels for interior and exterior decoration, such as ceilings, partitions, and exterior wall panels, etc. Its rich colors and diverse surface effects can create a unique decorative atmosphere. For the interior decoration of some high-end office buildings, Prepainted Metal coils with a wood grain imitation effect are often chosen as wall decorations to add a natural and warm feeling.
The home appliance industry: It is widely used in the manufacturing of home appliance casings, such as refrigerators, washing machines, air conditioners, microwave ovens, etc. Its excellent corrosion resistance and aesthetic appeal can not only protect the internal structure of household appliances but also enhance their appearance quality, meeting consumers' dual demands for both the beauty and practicality of household appliances.
Transportation industry: It can be used for the manufacturing of some components of transportation vehicles such as automobiles, trains, and ships, such as car body panels, train carriage side panels, and interior decoration of ships. It can provide good weather resistance and decorative properties while ensuring strength.
Other fields: It is used in the advertising industry to produce billboards and light boxes. Panels used in the furniture industry for making metal furniture, etc.
Production process
Base material selection: Commonly used base materials include hot-dip galvanized steel sheets, aluminized zinc steel sheets, electro-galvanized steel sheets, etc. Different substrates are suitable for different application scenarios based on their characteristics. For instance, hot-dip galvanized steel plates have a relatively low cost and good anti-rust performance, making them suitable for general construction fields. Aluminized zinc steel plates are more outstanding in terms of corrosion resistance and are often used in buildings or products in harsh environments.
Surface pretreatment: The surface of the substrate is cleaned, degreased, and chemically converted, etc., to remove oil stains and impurities on the surface, form a uniform chemical conversion film, and enhance the adhesion between the coating and the substrate.
Coating application: Organic coatings such as primer and topcoat are evenly applied to the surface of the pre-treated substrate by methods such as roller coating and spray coating. The primer mainly serves to enhance adhesion and prevent corrosion, while the topcoat provides functions such as color, gloss and weather resistance. According to different requirements, various types of coatings such as polyester (PE), silicon-modified polyester (SMP), and polyvinylidene fluoride (PVDF) can be selected. For instance, polyester coatings have a relatively low cost, excellent comprehensive performance and are suitable for general environments. PVDF coatings have outstanding weather resistance and chemical corrosion resistance, and are often used in high-end construction projects.
Baking and curing: The metal coils coated with the coating are sent into the oven and baked at a certain temperature to cure the coating and form a strong and durable protective film.
Quality inspection: Strict quality inspection is carried out on the produced Prepainted Metal Coil, including coating thickness inspection, adhesion inspection, corrosion resistance inspection, color difference inspection, etc., to ensure that the product quality meets relevant standards and customer requirements.
Looking for a trusted Prepainted Metal Coil supplier and manufacturer?
We provide high-quality PPGI / PPGL coils, custom colors, and factory-direct pricing for global buyers.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
FAQ (Frequently Asked Questions)
Q1: What is the difference between PPGI and PPGL?
A1: PPGI is prepainted galvanized steel, while PPGL is prepainted Galvalume steel (55% Al + 43.5% Zn). PPGL offers superior corrosion resistance.
Q2: What coating types are available for prepainted metal coils?
A2: Common coatings include PE, SMP, PVDF, HDP, and Polyester, depending on durability requirements.
Q3: Can the coils be single-side or double-side coated?
A3: Yes, both single-side and double-side coatings are available.
Q4: What colors can you provide?
A4: Standard colors include white, red, blue, green, black, and custom RAL or Pantone colors.
Q5: What is the typical coil weight and length?
A5: Coil weight is 3–8 tons, length depends on base steel thickness and width, usually 80–500 m per coil.
Q6: Are prepainted coils suitable for outdoor use?
A6: Yes, especially with PVDF, HDP, or SMP coatings, which provide UV and corrosion resistance.
Q7: Can I order custom thickness, width, or color?
A7: Absolutely. We accept customization for steel gauge, coating thickness, width, and color.
Q8: What is the minimum order quantity (MOQ)?
A8: MOQ is typically 5 tons per specification, but small trial orders are possible.
Q9: How are prepainted coils packed for export?
A9: Coils are wrapped with plastic film and waterproof paper, secured with steel straps; wooden pallets available on request.
Q10: Do you provide inspection and certification?
A10: Yes, we provide Mill Test Certificates (EN10204/3.1) and accept third-party inspection (SGS, BV, TUV) before shipment.
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