Differences Between PPGI And PPGL Sheets

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PPGI means pre-painted galvanized steel while PPGL describes pre-painted galvalume steel. Below is a list of differences between PPGI and PPGL.

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Basic composition and use

PPGI sheets are processed by coating with molten zinc. The zinc coating is a base metal that has protective properties making this type of sheet ideal and popular for roofing. It can also be used to produce outdoor billboards, washing machines, etc. PPGI sheets are not easily corroded and so can withstand strong sun and rain.

PPGL sheets are processed by coating with zinc, silicon, and aluminium. More precisely, the ingredients of the galvalume steel sheet have at least 55% aluminium and 43.5% zinc, with the rest being silicon and other elements. PPGL sheets can be used as roofing in addition to chimney pipes or ovens owing to their corrosion resistance, good heat resistance, and surface conductivity.

PPGI sheets that are galvanized with 100% zinc perform poorly compared to PPGL sheets when exposed to natural influences such as water. PPGL sheets may last beyond 10 years in good condition. They do not easily rust and do well when in contact with liquids that go through an oxidation process.

The lifespan of PPGL is almost double that of PPGI.

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Thickness and weight

Generally, PPGI sheets are lighter than PPGL sheets. The thickness however is dependent on the coating applied.

PPGL sheets are more corrosion resistant. When a PPGL sheet is cut, its edges become exposed which makes it more vulnerable to corrosion.

PPGI on the other hand is quite likely to become corroded. When corrosion happens, it is localised and less likely to spread through the whole sheet.

PPGL sheets possess a smoother finish in comparison with PPGI sheets which can be directly caused by the aluminum component in PPGL which PPGI sheets do not have. This makes it much easier to paint PPGL sheets without pre-treating them, although this is not advisable.

PPGI sheets cost less than PPGL sheets.

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PPGI and PPGL, which one is better for you?

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PPGI and PPGL are two different kinds of color coated steel sheets, which are widely used in advertising, construction, transportation, home appliances, and other industries, and they are very similar. However, there are still some differences. So what is the difference between PPGI and PPGL steel sheets? And which one is more suitable for you?

1. Different base materials

PPGI stands for Pre-Painted Galvanized Steel, while PPGL stands for Pre-Painted Galvanized Aluminum Steel. As the name implies, PPGI uses galvanized sheet (galvanized layer) as the base metal. PPGL, on the other hand, uses aluminized zinc sheet as the base metal and is coated with 55% aluminum, 43.3% zinc, and 1.6% silicon. This is the main difference between PPGI and PPGL, which will further affect their properties and applications.

2. Length of service life

Both zinc and aluminum-zinc coatings are used to protect the metal from rusting to extend its service life. In the case of zinc coatings, the base metal is destroyed when the galvanized layer is completely corroded. Generally, galvanized sheets can last 10 to 15 years. In contrast, aluminum and zinc alloys form microscopic areas of particles. Zinc-rich corrodes relatively preferentially, while aluminum-rich corrodes very slowly. Therefore, aluminum-zinc coatings are more resistant to corrosion than galvanized coatings. According to the data, the service life of PPGL is 3 times that of PPGI.

3. Weight difference

For the same coating thickness, Al-Zn coatings are lighter than zinc coatings. This is because the specific gravity of aluminum is lower than that of zinc. In other words, for the same weight, Al-Zn coating covers 3% more space than Zn coating.

4. Appearance difference

The surface of the PPGL sheet is smoother than the surface of the PPGI sheet. This is because aluminum has better adhesion than zinc. For the same reason, PPGL sheets can be painted directly without pretreatment. However, galvanized sheets require pre-treatment.

5. Differences in performance

The heat resistance of the PPGL sheet is better than that of the PPGI sheet. PPGL sheet can withstand temperatures up to 315°C. In addition, PPGL sheet has better corrosion resistance than PPGI. This is because the dense layer made of aluminum prevents further corrosion of the base metal.

6. Differences in application areas

Geographically, PPGI is suitable for hot or cold places, such as Vietnam, UAE, Saudi Arabia, Libya, Russia, Canada, Finland, etc., while PPGL is suitable for rainy areas, such as Singapore, Philippines, Kenya, Nigeria, Malaysia, Brazil, etc.

So which one is more suitable for you? The best way is to talk to a professional, like Panda Steel, and we will give you the best advice based on your location, weather, usage, budget, etc. No matter what you use, PPGI or PPGL sheets, you will enjoy their durability, safety, and good looks.

For more Galvalume Steel Coil for greenhouse pipesinformation, please contact us. We will provide professional answers.