PPGL Roll Forming Material Guide: Pre-Painted Aluzinc Steel, Coatings, Coil Sizes & Uses

PPGL Roll Forming Material (Pre-Painted Aluzinc Steel)

1. Overview of PPGL in Roll Forming

PPGL (Pre-Painted Galvalume / Aluzinc Steel) is a coated steel product where an Aluzinc (AZ) base material is coated with paint layers, combining superior corrosion resistance with a high-quality decorative finish.

The base material is typically AZ100 or AZ150 Aluzinc steel, coated with primer and topcoat systems. Compared to PPGI, PPGL offers better corrosion resistance, especially in outdoor environments.

In roll forming, PPGL is widely used for roofing, wall cladding, and architectural panels where both durability and appearance are critical.

2. Material Composition & Structure

PPGL consists of:

Steel base (cold rolled steel)
Aluminum-zinc (Aluzinc) coating
Primer coating
Top paint layer
Backing coat

Layer Structure:

Steel core
Aluzinc coating (AZ100–AZ150 typical)
Chemical pre-treatment
Primer coating
Top paint layer (front side)
Back coat (rear side)

3. Available Coil Specifications

Thickness Range

0.25mm – 1.2mm (most common)
Up to 2.0mm available

Coil Width

600mm – 1250mm

Coil Weight

3 tons – 10 tons

Coil ID / OD

ID: 508mm / 610mm
OD: up to 1400mm

Tolerance

Tight thickness tolerance
High surface quality

4. Mechanical Properties

Typical values:

Yield Strength: 180 – 350 MPa
Tensile Strength: 300 – 550 MPa
Elongation: 10% – 25%
Hardness: 100 – 180 HB

Grades:

DX51D (forming grade)
S320GD / S350GD

5. Coating Types (PAINT SYSTEMS)

PE (Polyester)

15–25 microns
Lifespan: 10–15 years
Cost-effective

SMP (Silicone Modified Polyester)

20–30 microns
Improved durability
Lifespan: 15–20 years

PVDF (Premium)

25–35 microns
Excellent UV resistance
Lifespan: 20–30+ years

Plastisol

100–200 microns
Thick coating for harsh environments

6. Surface Finishes

Gloss
Matte
Textured
Embossed
Wood grain / stone finish
Metallic finish

7. Common Roll Forming Applications

PPGL is used in:

Roofing panels (standing seam, trapezoidal, corrugated)
Wall cladding systems
Architectural panels
Sandwich panel outer skins
Flashing and trims
Prefabricated buildings
High-end building facades

8. Advantages of PPGL

Superior corrosion resistance vs PPGI
Long lifespan in outdoor environments
Excellent UV resistance
High aesthetic quality
Reduced maintenance
Ideal for harsh climates

9. Disadvantages / Limitations

Higher cost than PPGI
Paint cracking risk in tight bends
Surface scratching during forming
Requires careful handling
Edge corrosion still possible

10. Roll Forming Machine Considerations

Roll Tooling

High-quality chrome plated rollers essential
Perfect surface finish required

Speed

10–40 m/min

Lubrication

Often required for protection

Cutting

Flying shear preferred
Clean cutting critical

Common Issues

Paint cracking
Surface scratches
Roller marks
Oil canning

11. Common Problems in Production

Paint peeling or cracking
Surface marking from rollers
Color variation between coils
Oil canning in panels
Handling damage

12. Pricing Guide

Typical global pricing:

Low: $1000–$1200 per ton
Medium: $1200–$1600 per ton
High: $1600–$2400+ per ton

Factors affecting price:

Paint system (PE vs PVDF)
Coating thickness (AZ100 vs AZ150)
Color and finish
Supplier and origin

13. Comparison with Other Materials

PPGL vs PPGI

PPGL = better corrosion resistance
PPGI = lower cost

PPGL vs Galvalume

PPGL = painted version
Galvalume = base material

PPGL vs Aluminum

PPGL = stronger and cheaper
Aluminum = lighter and more corrosion resistant

14. Best Industries Using PPGL

Construction and roofing
Commercial buildings
Industrial facilities
Agriculture
Architectural projects

15. How to Choose PPGL

Choose PPGL When:

Outdoor environments
Long lifespan required
Coastal or harsh climates
High-end architectural finishes

Avoid When:

Budget is limited
Indoor-only applications
Tight forming profiles

16. FAQ Section

What is PPGL?

Pre-painted Aluzinc (Galvalume) steel.

Is PPGL better than PPGI?

Yes, for corrosion resistance.

What coating is best?

PVDF for long-term performance.

Does PPGL crack during forming?

It can if bends are too tight.

Is PPGL good for roofing?

Yes, it is one of the best materials available.

17. Machine Matcher Section

We supply roll forming machines for all material types including PPGL.

Custom-built machines to your profile
New machines built to specification
Global delivery available
UK and USA technical support

Contact:
Machine Matcher
Sales & Technical Team

Quick Specs (Card Style – Copy/Paste Ready)

Thickness
0.25–1.2mm

Yield Strength
180–350 MPa

Coil Width
600–1250mm

Coil ID
508 / 610mm