PPGL Coil & Sheet

Prepainted Galvalume steel coil and sheet for corrosion-resistant outdoor panel applications

PPGL coil and sheet from Everesteel use 55% aluminum-zinc alloy-coated steel substrates to create a painted surface with improved corrosion resistance for outdoor use. It is a practical choice for roofing, wall cladding, sandwich panels, and other applications where standard PPGI may be less suitable in humid, exposed, or coastal environments.

Available on 55% aluminum-zinc alloy-coated steel substrates
Designed for improved corrosion resistance in exterior conditions
Suitable for roofing, cladding, sandwich panels, and weather-exposed projects
Custom colors, slit coil, and cut-to-length support available
MOQ from 5 tons for sampling and production supply

Own Factory, Own Coating Lines, Full Specification Control

Everesteel designs and manufactures prepainted steel coils and sheets at our factory in Jiangyin, Jiangsu — one of China’s primary steel processing hubs. With 26,000+ tons of annual production capacity, we support procurement teams and panel manufacturers across 65+ countries, from initial sample approval through to full-volume orders.

We are not a trading company. Every coil that leaves our facility is produced on our own coating and processing lines, giving you direct control over specifications, lead times, and quality outcomes.

What is PPGL?

Prepainted Galvalume steel (PPGL) — also known as prepainted Aluzinc steel — is a Galvalume substrate that has been cleaned, chemically treated, primed, and coated with an organic paint system before fabrication.

The substrate is what sets PPGL apart. Instead of a zinc-only coating, PPGL uses a metallic coating made of 55% aluminum, 43.4% zinc, and 1.6% silicon. The aluminum content forms a stable, protective barrier layer, while the zinc provides sacrificial protection at cut edges and scratches. Together, this combination generally delivers longer corrosion protection than standard galvanized steel in outdoor and high-humidity conditions.

Like PPGI, PPGL arrives pre-finished — removing the need for secondary painting at your facility. The difference is durability: PPGL is the substrate you specify when the finished product needs to withstand the weather over the long term.

PPGL is most commonly specified for roofing sheets, wall cladding, sandwich panels, garage doors, and exterior decorative panels.

PPGI vs PPGL: Which Should You Choose?

Both are prepainted steel products with the same paint systems available. The difference is the metallic substrate beneath the paint.

Factor	PPGI	PPGL
Substrate	Galvanized (zinc coating)	Galvalume (55% Al-Zn alloy)
Corrosion resistance	Standard	Superior in outdoor/humid conditions
Best environment	Indoor, dry, general use	Coastal, humid, industrial, high-UV
Cut-edge protection	Excellent	Good, with strong barrier durability
Cost level	More economical	Premium
Typical use	Appliances, interior panels	Roofing, cladding, exterior panels

Choose PPGI when cost and general performance are balanced. Choose PPGL when long-term outdoor corrosion resistance is the priority.

Why Buyers Source PPGL from Everesteel

Corrosion Resistance Matched to Your Environment

The Galvalume substrate combines aluminum's barrier protection with zinc's sacrificial edge protection, outperforming zinc-only steel in humid, coastal, and industrial exposure. Because we run our own coating lines, we match AZ coating weight (AZ30–AZ150) and paint system to your actual site conditions — not a single generic grade for every climate. For coastal or high-corrosion projects, we recommend AZ150 with a durable topcoat and confirm the spec before quotation.

Heat Reflectivity and Weather Durability

The aluminum-rich surface reflects more solar heat than galvanized steel, helping keep buildings cooler and reducing thermal stress on the coating. Paired with an HDP or PVDF paint system, PPGL holds color and gloss far longer under UV exposure. We measure gloss and color against approved reference standards on every batch, so your roofing and cladding stays visually consistent across large projects and repeat orders.

Longer Service Life in Harsh Conditions

Where standard galvanized panels begin to show corrosion, a correctly specified Galvalume substrate keeps performing. This translates into fewer callbacks, longer warranties, and lower lifecycle cost for your finished product. Our QC process — salt spray, T-bend, impact, and adhesion testing — verifies that the coating will hold up in the field, not just on paper.

Custom Finishes for Roofing and Cladding Systems

Durability does not mean limited choices. We produce standard RAL and Pantone colors, custom-matched shades for brand or project palettes, and decorative options including wood grain, stone effect, and textured finishes — all on the same coating lines. You receive a lab drawdown and production sample for approval before mass production, with one supplier accountable for the match.

Technical Specifications

Parameter	Specification
Product	Prepainted Galvalume / Aluzinc steel coil (PPGL)
Substrate	Galvalume steel (55% Al, 43.4% Zn, 1.6% Si), ASTM A792
AZ coating weight	AZ30 – AZ150 g/m² (AZ150 recommended for exterior warranty applications)
Base steel thickness	0.12 mm – 1.2 mm
Coil width	600 mm – 1,250 mm (slit widths available)
Paint system	PE, SMP, HDP, PVDF
Top coat thickness	5 – 25 microns (primer + topcoat system)
Finish options	High gloss, matte, semi-gloss, wrinkle, embossed, anti-fingerprint
Color	RAL / Pantone standard; custom color matching available
Coil inner diameter	508 mm / 610 mm
Coil weight	3 – 8 tons per coil
Surface treatment	Chromate passivation or chromate-free (RoHS-compliant)
Standards	ASTM A792, JIS G3321, EN 10346, or agreed project standard
Typical applications	Roofing sheets, wall cladding, sandwich panels, garage doors, exterior panels

Specifications are indicative. Custom AZ coating weights, gauges, and widths are available on request. Minimum order quantity: 5 tons.

Surface and Pattern Options

PPGL is available across a broad range of surface effects, weighted toward roofing, cladding, and architectural exterior use.

Processing Capabilities

Downstream processing is available in-house, so your PPGL can arrive in the format your roofing line, panel plant, or door workshop actually needs — not just as master coil.

Slitting

Coils are slit to custom widths from 20 mm and above, with tight tolerances and clean edges suited to roll-forming roofing profiles and panel systems.

Cut-to-Length

Sheet blanks cut to your dimensions with flatness and squareness tolerances suitable for direct press or panel-forming feeding.

Embossing

Structural or decorative emboss patterns applied in-line, including linen, stucco, and custom profiles. Embossing adds rigidity and hides minor surface handling marks — useful for cladding and door panels.

Lamination

Protective or decorative films applied over the coated surface for transit protection, added scratch resistance, or a specific decorative effect on exterior panels.

Custom Color Matching

Submit a physical sample, RAL code, or Pantone reference, and our technical team formulates a matched batch — with a lab drawdown and production sample provided for approval before the full run begins.

Sourcing slit strip or custom-cut blanks for a roofing or cladding project?

Send your width, thickness, length, AZ coating, and color, and our team will confirm lead time and pricing within one business day.

Recommended Specifications by Application

Application	Recommended Thickness	AZ Coating	Paint System	Surface
Roofing sheets	0.35 – 0.70 mm	AZ100 – AZ150	HDP / PVDF	Solid color, matte
Wall cladding	0.35 – 0.60 mm	AZ100 – AZ150	HDP / PVDF	Smooth or embossed
Sandwich panel facings	0.35 – 0.60 mm	AZ100 – AZ150	PE / HDP	Matte solid
Garage door panels	0.40 – 0.70 mm	AZ60 – AZ120	PE / SMP	Wood grain / wrinkle
Roller shutter slats	0.30 – 0.50 mm	AZ60 – AZ120	PE / SMP	Solid / wrinkle
Agricultural buildings	0.35 – 0.70 mm	AZ120 – AZ150	HDP / PVDF	Solid color
Industrial buildings	0.40 – 0.80 mm	AZ120 – AZ150	HDP / PVDF	Solid, matte
Decorative exterior panels	0.40 – 0.60 mm	AZ100 – AZ150	PVDF	Wood grain / stone / matte

These are indicative starting points. Final specifications should be confirmed based on your climate, exposure level, forming process, and target service life.

Typical Applications

Roofing and Wall Cladding

For roof sheets, wall cladding, and building envelope panels.

Sandwich Panels

For facing sheets in insulated PU, EPS, and rock wool panels.

Garage Doors and Roller Shutters

For roll-formed door panels, garage doors, and shutter slats.

Agricultural and Industrial Buildings

For roofing and cladding in barns, sheds, and industrial steel buildings.

Decorative Exterior Panels

For feature facades, entrance cladding, and architectural exterior panels.

Quality Control and Certifications

Everesteel maintains a documented quality management system across every stage of production — from incoming substrate inspection through to final coil labeling and packaging.

In-process controls include:

Incoming Galvalume substrate inspection (thickness, AZ coating weight, mechanical properties)
Paint film thickness measurement at the coating line
Adhesion testing (cross-cut and T-bend)
Gloss and color measurement against approved reference standards
Salt spray and humidity cabinet testing for exterior grades
Final dimensional check before packaging

Test reports and mill certificates are issued with each shipment. Third-party inspection — including SGS, BV, and CCIC — can be arranged before loading on request.

FAQs

Q1. What is the difference between PPGL and PPGI?

PPGI uses a galvanized (zinc-only) substrate, while PPGL uses a Galvalume substrate made of 55% aluminum, 43.4% zinc, and 1.6% silicon. PPGL generally offers stronger corrosion resistance in outdoor, humid, and coastal environments, along with better heat reflectivity. PPGI is more economical and well suited to interior and general-use applications. For roofing and cladding exposed to weather, PPGL is usually the better long-term choice.

Q2. Which AZ coating weight should I choose?

It depends on your environment and target service life. AZ60–AZ100 suits general and moderately exposed applications. For coastal, industrial, or high-corrosion environments — and for projects requiring longer warranties — we recommend AZ150. Our technical team can advise based on your site conditions and project standard.

Q3. Which paint system is best for outdoor use?

For roofing, cladding, and exterior panels in high-UV or coastal areas, we recommend PVDF or HDP systems for long-term color retention and weather resistance. PE and SMP are suitable for shorter-life or less-exposed exterior applications and for cost-sensitive projects.

Q4. Is PPGL better for coastal environments?

Yes. The aluminum content in the Galvalume substrate forms a stable barrier that performs well against salt-laden coastal air, while the zinc provides sacrificial edge protection. For coastal projects, we typically recommend AZ150 combined with a PVDF topcoat and confirm the full specification before quotation.

Q5. What is your minimum order quantity for PPGL?

Our standard minimum order quantity is 5 tons per specification. For custom colors or non-standard dimensions, we recommend 5–10 tons to cover setup and color formulation costs. Contact us to discuss your project volume.

Q6. Can you supply custom colors and provide samples before bulk production?

Yes. Submit a physical sample, RAL code, or Pantone reference, and we produce a lab drawdown for review. Once you approve the color and specification in writing, we schedule mass production. Sample production typically takes 5–10 working days.

Q7. What is the typical lead time for PPGL orders?

Standard lead time is 15–25 days from order confirmation and deposit receipt. Custom colors requiring new paint formulation may add 7–10 days for approval. Expedited scheduling may be available depending on production capacity at the time of order.

Q8. Can PPGL be supplied as slit coil or cut sheet?

Yes. We operate slitting and cut-to-length lines on-site and can supply PPGL as master coil, slit coil, or cut-to-length sheet to your specified dimensions. Sheets are stacked, interleaved with protective paper where required, and packaged for export.

Related Products

PPGI Coil & Sheet

Prepainted galvanized steel with a zinc-coated substrate. Choose it over PPGL when your project is indoor or general-use and cost efficiency matters more than long-term outdoor corrosion resistance.

PPAL Coil & Sheet

Color-coated aluminum coil and sheet. A better fit than PPGL when weight reduction is a design priority or when you need natural corrosion resistance without a steel substrate.

PPCR Steel

Prepainted cold-rolled steel with a smooth, uncoated base. Specify it when you need a flat, paint-ready surface for interior or low-corrosion applications where a metallic coating isn't required.

Custom Color Coated Steel

Made-to-order coated steel matched to your exact color, gloss, and finish requirements. Select this when your project calls for specific brand palettes, custom patterns, or non-standard specifications beyond our stock range.

Prepainted Steel

Our full prepainted steel category overview. Start here when you're comparing substrates and coating systems and want to see the complete range before narrowing your specification.

Ready to Source PPGL? Start with the Right Information.

Send us the details below and our team will respond with pricing, lead time, and availability within one business day.

RFQ Checklist — include the following in your inquiry:

Application — what the material will be used for (e.g., roofing sheet, wall cladding, garage door)
Thickness — in millimeters (e.g., 0.45 mm)
Width — in millimeters (e.g., 1,000 mm)
AZ coating weight — if specified (e.g., AZ100, AZ150)
Paint system — PE, SMP, HDP, PVDF, or not sure yet
Color reference — RAL code, Pantone number, or physical sample
Quantity — in metric tons, and whether one-time or recurring
Destination country — for freight and lead time estimation