PPGI VS PPGL What is the difference between ppgi and ppgl?

Understanding the distinctions between PPGI and PPGL involves examining their production processes. The method employed for producing galvanized color coatings (PPGI) tends to be straightforward with a simpler process and shorter production cycle. In contrast, the creation of Galvalume color coatings (PPGL) is more intricate, involving a more complex and prolonged series of steps.

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Lastly, it is important to recognize that PPGI and PPGL vary in terms of value and cost-efficiency. When making a choice, customers must evaluate the advantages and disadvantages based on their specific needs to ensure the selection of the most suitable coating technology.

In conclusion, PPGI and PPGL represent distinct coating technologies differing in their applications and performance. The choice of which to utilize should be guided by the intended location of use, environmental conditions, and customer requirements.

Understanding the Strengths and Weaknesses of PPGL in Comparison to PPGI

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Nov 14, 2022

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Galvanized metal (GL metal) is commonly used in construction due to its exceptional corrosion resistance, making it ideal for various applications. When considering GL steel, many people often think of galvanized steel. But what exactly are PPGI and PPGL, and how do they differ?

Galvanized Steel Overview

Galvanized steel is produced through a hot-dipping process at a temperature of 600°C, using cold-rolled steel sheets as a base material which are then coated with an Al-Zn alloy. This coating includes 55% aluminum, 43.4% zinc, 1.6% silicon, and other trace elements. This unique alloy combines aluminum's durability with zinc's electrochemical protection, providing superior corrosion resistance along with an aesthetically pleasing shiny, silver-gray surface.

Key Benefits of Aluminized Zinc-Coated Steel

1. Enhanced Corrosion Resistance:

The dual-protection of zinc and aluminum in the coating provides three times higher corrosion resistance compared to pure zinc coatings. If the zinc layer wears off, the aluminum layer forms a dense oxide layer, preventing further base metal corrosion, resulting in a longer lifespan.

2. Attractive Finish:

Galvanized steel boasts a smooth, shiny silver finish, making it more visually appealing as a building material or decorative panel compared to standard galvanized steel.

3. Heat Resistance and Reflectivity:

The Al-Zn coating on this steel maintains good heat resistance, withstanding high temperatures up to 315°C without discoloration. Its heat reflectivity is also nearly double that of galvanized steel, making it excellent for roofing applications.

4. Strong Adhesion Properties:

Thanks to its superb adhesion, GL steel can be painted directly without pretreatment and is often used as a base material for color-coated steel. It also has good workability, allowing for easy processing like bending and stamping.

Disadvantages of Aluminized Zinc-Coated Steel

1. Reactivity with Wet Concrete:

Aluminum in the coating can react chemically with wet concrete, making it less suitable for flooring applications.

2. Reduced Anodic Protection:

With lower zinc content, the aluminum wraps around the zinc, reducing its electrolysis capability. This leads to rapid rusting if the GL sheet's edge is exposed. Therefore, GL sheets should be cut minimally, and cut edges should be protected with anti-rust or zinc-rich paint.

3. Higher Cost:

Aluminized zinc-coated steel generally costs more than galvanized steel.

4. Spread of Corrosion:

If a point on the GL sheet corrodes, the rust tends to spread across the entire surface, unlike galvanized sheets where corrosion often remains localized.

Choosing the Right Material

The decision between using aluminized zinc or galvanized metal should consider factors such as the environment of use and budget. Neither is ideal for coastal regions where stainless steel might be the better option. For further assistance, feel free to consult us for tailored advice.

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