The Fascinating World of Steel: Difference Between PPGI and PPGL Steel



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14 March 18
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Steel products and components come in all shapes, sizes, finishes and grades. These products have their own separate world – a world of steel, getting to know which can be quite fascinating and worthwhile, especially for businesses who use steel products and components in their everyday projects.

Our aim is to be your ultimate online resource for everything steel, trying to provide you with as much information as possible about this fascinating, largely unexplored world.
The topic we’ve decided to explore today is the difference between PPGI and PPGL steel.

Meet PPGI and PPGL Steel

Before we start discussing the difference between the two, it’s important you know what the terms ‘PPGI’ and ‘PPGL’ expand to.

Meet PPGI, which stands for Pre-painted galvanized iron steel.
Meet PPGL, which stands for Pre-painted galvalume steel.

Both of these steel variants are also known by the name of color coated steel in the industry.

Difference Between PPGI and PPGL Steel

So, what’s the difference between the two?
The primary difference between the two types of steel is in the coating applied to each variant. PPGI or pre-painted galvanized iron steel is evenly covered with a layer of zinc. The zinc coating provides anodic protection to the base material, prolonging the product’s service life.

PPGL or pre-painted galvalume steel, on the other hand, is coated with a mix of aluminum, zinc and other trace elements. The usual composition of galvalume coating is 55% aluminum, 43.4% zinc and 1.6% trace elements.

Attributed to the difference in their coatings, PPGI and PPGL steel consequently vary in their properties as well.

1.PPGL steel offers a smoother finish than pre-painted galvanized steel.
2.Corrosion in PPGL steel spreads, whereas in PPGI steel it remains localized and do not spread easily.
3.PPGL steel is more corrosion resistant than PPGI steel, however, its cut edges are less protected. This is because of the steel coating’s honeycomb structure, which does not provide sufficient protection to exposed edges.

And this brings us to the end of today’s discussion. If you have any further questions about PPGI or PPGL steel, the answers to which you feel were not addressed in this post, don’t feel hesitant to reach out.

If you are shopping for high quality color coated steel coil for your next project, you can also check out our inventory.

Till the next post, goodbye!

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