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Differences Between PPGI And PPGL Sheets

About to roof your house but wondering in regards to the best form of metal roofing sheet you can utilize? At Wanzhi Steel, we provide you with good quality PPGI and PPGL sheets at economical prices. PPGI identifies pre-painted galvanized steel while PPGL refers to pre-painted galvalume steel.

Below is a list of differences between PPGI and PPGL which will assist you to help make the best choice dependant upon the intended utilization of your sheets:

What Is PPGI Sheet?

PGI is pre-painted galvanised iron, also known as pre-coated steel, coil coated steel, color coated steel, etc. Typically this material uses galvanized iron coil (GI coil) as raw material, which is pre-coated as a way to provide corrosion resistance by a hot dip zinc coated process. GI typically refers to essentially pure zinc (>99%) continuously hot-dip coated steel, as opposed to batch dip processes. PPGI refers to factory pre-painted zinc-coated steel, where the steel is painted before forming.

PPGI Strip
PPGI Strip

What Is PPGL Sheet?

PPGL stands for pre-painted galvalume steel, which is with a galvalume steel sheet as a substrate. The common galvalume coating is made of 55% aluminum, 43.4% zinc, and 1.6% silicon. PPGL sheets combine the strength of steel with the anti-corrosive capabilities of a metal coating of zinc or aluminium. It is exceptionally resistant to weather and environmental degradations and can be punched, pressed, roll-formed, or joined in any way possible per requirement. They are made in a variety of specifications to suit different applications. Also, they are lightweight and strong for easy placement and to provide high durability.

Differences Between PPGI And PPGL Sheets

Below let’s review their differences.

1. Basic Composition and Usage

As mentioned, PPGI sheets are processed by coating these with molten zinc. The zinc coating is a base metal that has protective values making this sort of sheet ideal and popular for roofing houses. They could also be used to produce outdoor billboards, automatic washers, etc. PPGI sheets are certainly not easily corroded and therefore can withstand strong sun and high rains.

PPGL sheets alternatively are processed by coating all of them with zinc, silicon, and aluminum. More precisely, the ingredients of the galvalume steel sheet are at least 55% aluminum, 43.5% zinc, and the rest being silicon and other elements. One of the biggest advantages of investing in PPGL steel coils is the superior quality of its coating. The coating can be applied to both sides of the material to produce uniform results. The product is consistent in color, thickness, texture, and performance. This superior steel product is more eco-friendly compared to many other steel products on the market today. It eliminates imperfections such as uneven applications and oil and dirt residue.

PPGL Coil
PPGL Coil

The use of pre-painted galvalume steel is famous within the construction industry because it is extremely corrosion resistant. However, PPGL is far more effective when it comes to preventing corrosion due to aluminum that is used at the same time. It is also considerably more scratch-resistant and might withstand the elements easily, protecting the inside of the buildings in which it is placed. Moreover, galvalume coating is very strong, far more strong than aluminum, partially because aluminum is much more flexible. Ideal for coastal applications, and areas rich in rates of precipitation, you can benefit when utilizing PPGL sheets that happen to be constructed in this manner.

2. Durability:

As stated, both zinc finishing and also Al-Zn covering are utilized to protect the metal from rusting to prolong its life span. For the galvanized sheet, the base metal will be damaged when the zinc covering is all worn away. Normally, a galvanized sheet might last for 10 to 15 years. While lightweight aluminum and zinc alloy forms microscopic bit areas. The Zn-rich phase will rust preferentially, while the Al-rich stage will corrode extremely gradually. So Al-Zn layer is more corrosion-resistant than the zinc-coated steel sheet. According to information, the life span of the PPGL sheet is 3 times longer than that of the PPGI sheet. Below are some images for you.

PPGI sheets that happen to be galvanized with 100% zinc, the performance is comparatively lower than that of PPGL sheets when open to natural environments like water. PPGL sheets may last beyond a decade in good shape. They do not easily rust and thrive when in touch with liquids that go through an oxidation process.

3. Thickness & Weight:

Generally, PPGI sheets are lighter than PPGL sheets. The thickness however is dependent upon the coating applied on either of the two. With the same covering density, the Al-Zn finish is lighter than zinc finishing. It is due to the fact that the details weight of light weight aluminum is less than that of zinc. That is to state, with the same weight, the Al-Zn finish can cover 3% more space than the GI sheet.

Galvanized Coil
Galvanized Coil

4. Corrosion & Heat Resistance:

PPGL sheets are definitely more corrosion-resistant. Even when it can occur, it spreads evenly on the sheet. Each time a PPGL sheet is cut, its edges become exposed and therefore which makes it more prone to corrosion. PPGI on the other hand is quite likely going to become corroded. When corrosion happens, it really is localized and much less very likely to spread throughout the complete sheet.

The heat resistance of the PPGL sheet is better than that of the PPGI sheet. PPGL sheet can withstand temperature levels of 315 ℃. Likewise, PPGL sheets have much better deterioration resistance than PPGI. It is because the dense layer made of aluminum can protect against the base steel from more wearing down.

5. Final Finish:

PPGL sheets use a smoother finish when compared with PPGI sheets which are often directly related to the aluminum component in PPGL which PPGI sheets miss. It is due to the better attachment of aluminum than zinc. For the same factor, PPGL sheets can be repainted directly without pre-treatment. Nevertheless, it is needed to be pre-treated for galvanized sheets. This also makes it much simpler to paint PPGL sheets without pre-treating them, although it is not advisable to achieve this.

Galvalume Coil
Galvalume Coil

6. Cost:

PPGI sheets are relatively less than PPGL sheets. The standard prices connected with PPGL sheets may be associated with their durability and corrosion resistance properties.

So, the bottom line is, the protective coat applied around steels sheets is the thing that determines whether or not they are PPGI (galvanized) or PPGL (galvalume) sheets. Both types contain have zinc being a coating but PPGL has aluminum and silicone moreover. The lifespan of PPGL is practically double those of PPGI.

Which One Is Right for Me?

Except for the distinctions, PPGI & PPGL sheets are additionally very comparable. Both of them have useful features, such as superb rust resistance, formability, and alleviation to repaint on. Both are extensively used in building, shipbuilding, car manufacturing, furniture, the electric industry, and more.

So which one is more suitable for you? The very best way is to speak with somebody professional, such as Wanzhi Steel, which will certainly use you the very best recommendation according to your area, climate, meant use, spending plan, etc. No matter what you will make use of, PPGI or PPGL sheets, you will certainly enjoy its longevity, safety, and also excellent appearance. Wanzhi Steel will certainly be constantly below for you. Please feel free to call us!

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