Prepainted Galvalume Steel Coils: The Ideal Choice for Your Projects

Discover why Prepainted Galvalume Steel Coils are the best option for your project. With outstanding corrosion resistance and endurance, these high-quality coils offer long-term protection. Prepainted Galvalume Steel Coils provide great performance in a variety of applications, including roofing and cladding. Their zinc-aluminum alloy coating improves corrosion resistance, while the variety of available colors and finishes adds aesthetic value to your designs. Choose Prepainted Galvalume Steel Coils for their dependability and versatility in realizing your projects’ maximum potential. Trust in their ability to deliver exceptional results and safeguard the life of your constructions.

prepainted galvalume steel coils

Definition of Prepainted Galvalume Steel Coils

Prepainted galvalume steel coils are a type of coated steel product that combines galvalume steel’s corrosion resistance with the aesthetics and versatility of pre-painted coatings.  Galvalume steel is created by covering a steel substrate with a zinc-aluminum alloy, which has high corrosion resistance and durability. The prepainted coating is applied to galvalume steel coils using a continuous coil coating process, which provides a variety of color options and finishes. These coils are widely utilized in the construction sector for roofing, siding, and other architectural purposes. Prepainted galvalume steel coils offer both structural strength and aesthetic appeal, making them a popular choice for a variety of applications.

Prime Prepainted Galvalume Steel Coils’ Properties and Manufacturing Method

Prime prepainted galvalume steel coils are high-quality coated steel coils that have undergone a rigorous manufacturing process to meet specific quality standards.


Prime prepainted galvalume steel coils possess several key properties that make them a preferred choice in various applications. These properties include:

Corrosion Resistance: Galvalume steel is composed of a zinc-aluminum alloy coating, typically consisting of approximately 55% aluminum, 43.5% zinc, and 1.5% silicon. This unique alloy composition provides exceptional corrosion resistance, protecting the underlying steel substrate from rust and other forms of corrosion.

Weatherability: Prime prepainted galvalume steel coils offer excellent resistance to weathering effects such as UV radiation, moisture, and atmospheric pollutants. This ensures that the coils maintain their appearance and performance over an extended period, even in challenging environmental conditions.

Flexibility and Formability: These coils exhibit excellent formability, allowing them to be easily shaped, bent, and formed without the risk of cracking or coating damage. This flexibility makes them suitable for various architectural and design applications.

Durability: The combination of the galvalume coating and the topcoat paint layer provides enhanced durability, offering protection against scratches, abrasion, and mechanical damage. This durability contributes to the long lifespan of the coated steel coils.

prepainted galvalume steel coils

Manufacturing Method

The manufacturing method of prime prepainted galvalume steel coils involves several steps:

Steel Substrate Preparation: The steel substrate undergoes a series of cleaning processes, including degreasing and surface conditioning, to remove any contaminants and improve the adhesion of subsequent coatings.

Hot-Dip Galvanizing: The cleaned steel substrate is immersed in a bath of molten zinc-aluminum alloy. The hot-dip galvanizing process results in the formation of a tightly bonded zinc-aluminum coating on the steel surface. This coating provides excellent corrosion resistance and serves as a barrier against environmental elements.

Application of Primer: A primer layer is applied to the galvalume-coated steel to enhance the adhesion of the subsequent paint layers. The primer also acts as an additional protective barrier.

Application of Topcoat Paint: The topcoat paint, which is typically a high-quality polyester or polyvinylidene fluoride (PVDF) coating, is applied to the primed surface. The paint layer provides color, gloss, and additional protection against weathering and UV radiation.

Curing and Quality Control: The painted coils are cured in ovens or through a controlled heating process to ensure proper adhesion and curing of the paint layers. Stringent quality control measures are implemented throughout the manufacturing process to monitor coating thickness, adhesion, color consistency, and overall product quality.

prepainted galvalume steel coils

By following this meticulous manufacturing process, prime prepainted galvalume steel coils are produced with exceptional properties, making them a reliable and versatile material for various applications in the construction industry.

Distinguish between Prepainted Galvanized Steel and Prepainted Galvalume Steel

Prepainted Galvanized Steel (PPGI) and Prepainted Galvalume Steel (PPGL) are both pre-painted steel products, but they differ in terms of the base metal they are made from. Here’s a comparison between PPGI and PPGL:

Base Metal

PPGI: PPGI is made from a base metal of galvanized steel, which is carbon steel that has been coated with a layer of zinc. The zinc coating provides excellent corrosion resistance to the underlying steel substrate.

PPGL: PPGL is made from a base metal of galvalume steel, which is a zinc-aluminum alloy-coated steel. The coating on galvalume steel consists of approximately 55% aluminum, 43.5% zinc, and 1.5% silicon. This zinc-aluminum alloy provides enhanced corrosion resistance compared to traditional galvanized steel.

Corrosion Resistance

PPGI: PPGI offers good corrosion resistance due to the zinc coating on the steel substrate. The zinc functions as a sacrificial layer, shielding the steel underneath from corrosion. However, in highly corrosive environments or exposure to harsh elements, the zinc coating on PPGI may degrade over time.

PPGL: PPGL outperforms PPGI in terms of corrosion resistance. The addition of aluminum in the coating forms a protective barrier that enhances the resistance to corrosion. The aluminum in the zinc-aluminum alloy coating provides self-healing properties, further protecting the underlying steel from corrosion.

Alloy Composition

PPGI: The zinc coating on PPGI typically ranges from 80 to 275 grams per square meter. The thickness of the zinc coating affects the durability and longevity of the corrosion protection.

PPGL: The zinc-aluminum alloy coating on PPGL consists of approximately 55% aluminum, 43.5% zinc, and 1.5% silicon. This composition enhances the corrosion resistance and offers improved durability in challenging environments.


PPGI: PPGI is commonly used in applications where corrosion resistance and cost-effectiveness are essential factors. It is widely employed in roofing, cladding, garage doors, appliances, automotive components, and general construction.

PPGL: PPGL is preferred in applications where superior corrosion resistance and extended durability are required. It is often used in environments with high humidity, coastal areas, and industrial settings. PPGL finds applications in roofing, cladding, agricultural buildings, outdoor infrastructure, and other applications that demand enhanced protection against corrosion.

prepainted galvalume steel coils

The prices

In terms of cost, prepainted galvanized steel coil is often less expensive than prepainted galvalume steel coil. The price discrepancy is primarily due to raw material costs and the production method. Zinc is less expensive than the aluminum-zinc alloy used in Galvalume steel, therefore galvanized steel coil is a more cost-effective option for budget projects.

While PPGI is less expensive to begin with, it has a shorter lifespan and requires more frequent maintenance and repainting.  Galvanized steel may cost more over the product’s lifetime than Galvalume steel. PPGL often costs 20-50% more than PPGI at first, but it can last 2-3 times as long.

When deciding between prepainted Galvanized steel coil and prepainted Galvalume steel coil, you must consider not only the initial cost, but also the total cost of ownership during the service life. Galvalume steel is frequently the more cost-effective alternative for high-volume or long-term applications due to its durability and low maintenance requirements. However, for minor or temporary applications on a limited budget, galvanized steel coil is a more cheap option.

Aesthetic Options

PPGI: PPGI offers a wide range of colors and finishes, allowing for customization and design flexibility. It can be coated with various paint systems that create vibrant colors, metallic effects, or textured finishes, making it suitable for architectural and decorative purposes.

PPGL: PPGL also provides a range of colors and finishes, although the options may be slightly more limited compared to PPGI. The available finishes for PPGL include smooth, embossed, or matte surfaces, providing aesthetic choices for different applications.

prepainted galvalume steel coils

In summary, PPGI and PPGL differ in terms of the base metal and coating composition. PPGI is made of galvanised steel with a zinc coating, whereas PPGL is built of galvalume steel with a zinc-aluminum alloy coating. PPGL offers enhanced corrosion resistance, making it suitable for more demanding environments, while PPGI provides cost-effectiveness and a wide range of aesthetic options.


Finally, when it comes to choosing the right material for your projects, Prepainted Galvalume Steel Coils stand out as the best option. They provide unrivaled performance in a variety of applications, including roofing and cladding, because of their superior corrosion resistance, durability, and long-term protection. The zinc-aluminum alloy coating not only improves corrosion resistance but also adds visual appeal, with a variety of colors and finishes to select from. Prepainted Galvalume Steel Coils are reliable, versatile, and of high quality, ensuring great results and the lifespan of your projects. Prepainted Galvalume Steel Coils are the logical choice for your projects and will help them reach their full potential.

Stavian Industrial Metal Joint Stock Company


  • Headquarters: No.508 Truong Chinh Street, Nga Tu So Ward, Dong Da District, Hanoi City
  • Hai Phong Branch: 6th Floor, Thanh Dat 1 Tower, No.3 Le Thanh Tong Street, May To Ward, Ngo Quyen District, Hai Phong City
  • Southern Branch: 12Ath Floor, Vincom Center, No.72 Le Thanh Ton, District 1, Ho Chi Minh City
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