Which is better, PPGI or PPGL?

When it comes to constructing or renovating buildings, selecting the right materials is crucial. Among the many decisions builders and architects need to make, one important choice is the type of coating for metal surfaces, such as roofing, cladding, and siding. Two popular options are PPGI (Prepainted Galvanized Iron) and PPGL (Prepainted Galvalume), and each has its own set of advantages and disadvantages. In this article, we'll explore the differences between PPGI and PPGL to help you make an informed decision for your building project.

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1. Composition:

PPGI, or Prepainted Galvanized Iron, is a coated steel product made by applying a layer of paint over a galvanized steel base. Galvanized steel is steel coated with a layer of zinc to protect it from corrosion.

PPGL, or Prepainted Galvalume, on the other hand, is produced using a different base material. It consists of steel coated with a combination of zinc and aluminum, which provides enhanced corrosion resistance compared to traditional galvanized steel.

1. Corrosion Resistance:

One of the primary distinctions between PPGI and PPGL is their corrosion resistance. PPGL, with its zinc-aluminum coating, offers superior protection against rust and corrosion, making it an excellent choice for buildings located in humid, coastal, or industrial environments. PPGI, while still offering corrosion resistance due to its galvanized base, may not perform as well in severe or corrosive conditions.

1. Durability:

PPGL tends to be more durable than PPGI because of its superior corrosion resistance. PPGL-coated structures are likely to have a longer lifespan, reducing maintenance and replacement costs over time. This makes PPGL a preferred choice for long-term building projects.

1. Cost:

PPGI is generally more affordable than PPGL. The cost difference is primarily due to the use of aluminum in PPGL coatings, which is a more expensive material than zinc. If budget constraints are a significant factor in your project, PPGI might be the more attractive option.

1. Aesthetic Options:

Both PPGI and PPGL come in a wide range of colors and finishes. Architects and builders can select from various options to achieve the desired aesthetic appearance for their projects. The choice between the two coatings should be based on other factors like environmental conditions and budget rather than aesthetic considerations.

1. Environmental Considerations:

PPGL is often considered more environmentally friendly compared to PPGI. The inclusion of aluminum in the coating makes PPGL a more sustainable choice, as aluminum is readily recyclable. Additionally, PPGL's extended lifespan reduces the need for replacement, further reducing the environmental impact.

1. Application:

The choice between PPGI and PPGL may also depend on the specific application. PPGL's enhanced corrosion resistance makes it ideal for roofing and cladding in areas with high humidity, coastal proximity, or heavy industrial pollution. PPGI is a good choice for applications where the environmental conditions are less severe and cost is a more significant concern.

In conclusion, the choice between PPGI and PPGL coatings ultimately depends on your building project's specific needs and constraints. If you are looking for superior corrosion resistance, durability, and environmental sustainability, PPGL is likely the better option. On the other hand, if budget constraints are paramount, and you are not dealing with extremely corrosive environments, PPGI can be a cost-effective alternative. Consulting with experts and considering the local climate and conditions will help you make an informed decision that ensures the longevity and performance of your building.

Pre-Painted Galvanized Iron Steel, also called PPGI, and Pre-Painted Galvalume Steel, PPGL, are two different types of color coated steel. Both PPGI and PPGL are used in a wide range of industries such as construction, transportation, and the appliance industry. They are both very similar but still have unique differences.

Different Type of Substrate 

Galvanized steel, PPGI, is coated completely with zinc, while Galvalume steel, PPGL, is coated with aluminum, zinc, and a small amount of silicone. This provides superior corrosion resistance and durability over the typical galvanized coating. This is the biggest difference between PPGI steel and PPGL, which is the reason for the differences in many features such as weight, product life, appearance, price, and applications.

Weight Difference of PPGI vs PPGL 

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Because the specific weight of aluminum is less than the specific weight of zinc, the aluminum zinc coating on PPGL will weigh less with the same coating thickness. Which also means that the Al-Zn coating, with the same weight, can cover 3% more space than PPGI.

Service Life 

Both zinc and the aluminum zinc coating help to protect metal against rusting to prolong product service life. With PPGI, when the zinc coating corrodes, the base metal will become damaged. A galvanized PPGI sheet may last approximately 10 to 15 years.

With the aluminum zinc alloy on PPGL, the aluminum rich material will corrode slowly while the zinc rich portion will corrode preferentially. This provides added corrosion resistance over strictly the zinc coating of PPGI. PPGL can last up to three times longer than PPGI.

Difference in Appearance 

The PPGL surface will appear to be smoother than the surface of PPGI.  Because aluminum has better adhesion properties than zinc, PPGL may not require the same pretreatment for painting as galvanized sheets require.

Heat Tolerance and Erosion 

PPGL offers better heat resistance than PPGI, with the ability to withstand temperatures up to 315°C. Because PPGL provides improved corrosion resistance with a dense layer of aluminum the base metal is further protected against erosion. The cut edge of PPGL is less protected, however, due to the honeycomb structure of the coating which does not sufficiently protect exposed edges.  A coating can be applied to these exposed edges for added protection.

Applications for Both PPGI and PPGL 

Both PPGI and PPGL are used in various roofing and wall paneling applications. Because PPGL better corrosion resistance it is more suitable for harsh outdoor environments such as coastal areas with exposure to seawater. PPGL also provides excellent heat resistance which makes it a popular material for ovens and chimney pipes.

Difference in Price 

The price for PPGL is typically slightly more than PPGI due to added performance and fewer manufacturers. 

Quality Adhesives and Coatings for Prepainted Metal

Working with an experienced industrial adhesives and coil coating supplier will help you to understand your options in the various coatings available for prepainted metal. Universal Chemicals & Coatings, Inc., UNICHEM, is a custom chemical and coatings provider with more than 50 years of experience. UNICHEM offers high-performance functional coatings and laminating adhesives for steel sheets manufactured with a continuous coil coating process. We offer the leading high-tech engineers in the industry who provide troubleshooting and customized chemistry solutions to meet your adhesive or coating needs.

UNICHEM has been a custom chemical and coating technology leader, recognized for improving process efficiencies and product quality. We follow a strict quality policy with proprietary procedures in addition to our ISO9001:2015 registration. Contact us with any questions on the best types of adhesives and coatings for your prepainted, coil coating metal process.

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