Galvanized Steel PPGI and PPGL Steel Sheets: What's the Difference?
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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.
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Weight Difference of PPGI vs PPGL
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.
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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.
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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.
Differences between PPGI and PPGL
| Base Metal Coating | Zinc (Galvanized) | 55% Aluminum, 43.5% Zinc, 1.5% Silicon (Galvalume) |
| Corrosion Resistance | Good (suitable for mild environments) | Superior (ideal for harsh environments) |
| Durability | Moderate | High durability, longer lifespan |
| Reflective Properties | Low | High (improves energy efficiency) |
| Applications | Roofing, cladding, appliances, automotive parts | Roofing, cladding, solar panels, agricultural buildings |
1. Chemical conversion coating (for passivation)
2. Primer layer (base coat) for adhesion
3. Fine coating layer (base/top coat for protection & aesthetics)
Dual primer+topcoat design enhances corrosion resistance
- Symmetrical structure suggests double-sided coating process
- Typical applications: architectural panels/appliance surfaces
Specifications
- PPGL Specifications
|
Product Name |
Color Coated Galvalume Steel Coil PPGL |
|
Thickness |
0.13mm-0.8mm |
|
Width |
600mm-1250mm |
|
Length |
Support Customization |
|
Color |
According RAL Color Card (Can provide custom pattern) |
|
Paint |
PE, SMP, HDP, PVDF |
|
Primer |
Epoxy primer, Polyester primer, Water soluble acrylic primer, Polyurethane primer |
|
Coating Thickness |
Top Coat: 10-30mic, Back Paint: 5-25mic |
- Color Coated Galvanized Steel Coil PPGI
|
Product Name |
Color Coated Galvanized Steel Coil PPGI |
|
Thickness |
0.13mm-0.8mm |
|
Width |
600mm-1250mm |
|
Length |
Support Customization |
|
Color |
According RAL Color Card (Can provide custom pattern) |
|
Paint |
PE, SMP, HDP, PVDF |
|
Primer |
Epoxy primer, Polyester primer, Water soluble acrylic primer, Polyurethane primer |
|
Coating Thickness |
Top Coat: 10-30mic, Back Paint: 5-25mic |
