GI vs PPGL vs Aluminum: Best Roll Forming Material Comparison Guide

GI vs PPGL vs Aluminum Roll Forming Materials

1. Overview: GI vs PPGL vs Aluminum

GI (Galvanized Steel), PPGL (Pre-Painted Galvalume), and Aluminum are three of the most commonly used materials in roll forming.

They are widely used in:

Roofing panels
Wall cladding
Flashing and trims
Gutters and downpipes

Each material offers different advantages in:

Corrosion resistance
Cost
Strength
Appearance

2. What is GI (Galvanized Steel)?

GI is steel coated with a layer of zinc to protect against corrosion.

Key Features:

Zinc coating (Z100–Z600)
Strong and durable
Cost-effective
Widely available

👉 Common use: roofing, purlins, fencing

3. What is PPGL (Pre-Painted Galvalume)?

PPGL is steel coated with aluminum-zinc alloy (Aluzinc) and then painted.

Key Features:

Aluminum-zinc coating (AZ50–AZ150)
Paint system (PE, SMP, PVDF)
High corrosion resistance
Premium finish

👉 Common use: roofing and cladding

4. What is Aluminum?

Aluminum is a lightweight metal with natural corrosion resistance.

Key Features:

No need for protective coating
Lightweight
Highly formable
Long lifespan

👉 Common use: gutters, trims, architectural panels

5. Key Differences Between GI, PPGL, and Aluminum

Corrosion Resistance

GI: Good
PPGL: Very High
Aluminum: Excellent

👉 Best → Aluminum / PPGL

Strength

GI: High
PPGL: High
Aluminum: Medium

👉 Best → GI / PPGL

Weight

GI: Heavy
PPGL: Heavy
Aluminum: Lightweight

👉 Best → Aluminum

Cost

GI: Low
PPGL: Medium
Aluminum: High

👉 Best → GI

Formability

GI: Good
PPGL: Medium (paint limits bending)
Aluminum: Excellent

👉 Best → Aluminum

Appearance

GI: Industrial finish
PPGL: High-quality painted finish
Aluminum: Premium finish options

👉 Best → PPGL / Aluminum

6. Quick Comparison

GI (Galvanized Steel)

Strength: High
Corrosion Resistance: Medium–High
Cost: Low
Formability: High

PPGL (Pre-Painted Galvalume)

Strength: High
Corrosion Resistance: Very High
Cost: Medium
Formability: Medium

Aluminum

Strength: Medium
Corrosion Resistance: Excellent
Cost: High
Formability: Very High

7. Best Applications by Material

GI

Purlins
Structural components
Fencing
Industrial roofing

PPGL

Roofing panels
Wall cladding
Flashing
Architectural systems

Aluminum

Gutters and downpipes
Flashing and trim
Lightweight roofing
Coastal applications

8. Machine Considerations

GI

Moderate tooling wear
Standard roll forming machines

PPGL

Requires smooth rollers
Care needed to avoid paint damage

Aluminum

Low tooling wear
Higher speeds possible
Surface protection critical

9. Common Problems in Production

GI Issues

Zinc coating damage
White rust if stored poorly

PPGL Issues

Paint cracking on tight bends
Surface scratches

Aluminum Issues

Denting
Surface marking
Oil canning

10. Pricing Comparison

Typical global pricing:

GI: $700–$1100/ton
PPGL: $900–$1400/ton
Aluminum: $2000–$3500/ton

11. Which Material Should You Choose?

Choose GI If:

You need low cost
Strength is important
Product is not highly visible

Choose PPGL If:

Appearance matters
You need long lifespan
Used in roofing or cladding

Choose Aluminum If:

Corrosion resistance is critical
Weight reduction is important
Used in coastal or premium applications

12. FAQ Section

Which is better GI or PPGL?

PPGL offers better corrosion resistance and appearance.

Is aluminum better than PPGL?

Aluminum has superior corrosion resistance but higher cost.

What is the cheapest option?

GI is the most cost-effective.

Which material lasts longest?

Aluminum and PPGL typically last longer than GI.

Can all be roll formed?

Yes, all three materials are commonly roll formed.

13. Machine Matcher Section

We help you select the right material and machine for your production.

GI, PPGL, and aluminum roll forming machines
Custom-built solutions
Multi-material production lines
Global delivery available
UK and USA engineering support

Contact:
Machine Matcher
Sales & Technical Team

Quick Specs (General Comparison)

Thickness
0.3–1.2mm

Yield Strength
GI / PPGL: 250–550 MPa
Aluminum: 80–300 MPa

Coil Width
600–1250mm

Coil ID
508 / 610mm