PPGI is pre-painted galvanised iron, also known as pre-coated steel, coil coated steel, color coated steel etc., typically with a hot dip zinc coated steel substrate.
PPGI refers to factory pre-painted zinc coated steel, where the steel is painted before forming, as opposed to post painting which occurs after forming.
The hot-dip metallic coating process is also used to manufacture steel sheet and coil with coatings of aluminum, or alloy coatings of zinc/aluminum, zinc/iron and zinc/aluminum/magnesium which may also be factory pre-painted. While GI may sometimes be used as a collective term for various hot dip metallic coated steels, it more precisely refers only to zinc coated steel.
In our Hometown, Jinghai County, which is a little county in North of China, over 30 million tons of such coated steel is produced today in over 300 coating lines.
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Coating type
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Pencil hardness
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Gloss（%）
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Tbend
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MEK
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Reverse impact
J
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Resistance to salt spray（h）
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low
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in
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high
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low
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in
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high
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Polyester
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≥F
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≤40
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40～70
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＞70
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≤5T
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≤3T
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≤1T
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≥100
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≥9
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≥500
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Silicon modified polyester
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≥F
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≤40
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40～70
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＞70
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≤5T
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≤3T
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≤1T
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≥100
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≥9
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≥1000
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High-durability polyester
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≥HB
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≤40
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40～70
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＞70
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≤5T
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≤3T
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≤1T
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≥100
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≥9
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≥1000
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Polyvinylidene fluoride
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≥HB
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≤40
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≥1000
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