Sino Steel supplies prepainted Galvalume steel coil for roofing, cladding, panels and downstream roll-forming production. As a PPGL steel coil manufacturer and supplier, we match the Al-Zn metallic-coated substrate, paint system, color, gloss, coil configuration, factory slitting and export packing to the finished product requirement.
The visible paint sits on a Galvalume / Al-Zn metallic-coated steel substrate. A workable PPGL order should connect the base steel, 55% Al-Zn-Si coating route, pretreatment, primer, top paint and back coat rather than treating the color as the entire product.
PPGL should be purchased as a complete material route: substrate + Al-Zn coating + paint system + approved color + forming requirement.
The top paint can use the same RAL color and resin family, but the material underneath is different. PPGI uses a galvanized zinc-coated substrate; PPGL uses a Galvalume / Al-Zn alloy-coated substrate.
Galvanized / zinc-coated substrate plus organic paint system.
Galvalume / Al-Zn alloy-coated substrate plus organic paint system.
RAL 5015 PPGL and RAL 5015 PPGI can match visually while still being different materials.
The substrate controls much of the coil's strength and forming behavior. The factory and mill review should confirm the base-steel designation and Al-Zn metallic coating requirement before the decorative paint system is released.
Use the commercial, forming, drawing or structural designation already required by the downstream profile.
This page is centered on conventional ASTM A792 Type 1 55% Al-Zn-Si Galvalume / Aluzinc substrate.
Roofing and cladding lines need a substrate that suits the specified bend and roll-forming route.
ASTM A792/A792M and EN 10346 + AZ are key substrate routes; ASTM A755/A755M and EN 10169 address the prepainted / coil-coated product layer.
PE, SMP, HDP and PVDF are common procurement descriptions in the color-coated steel market. The actual coating formulation, primer, topcoat, back coat, film build and forming requirement should still be confirmed from the approved system rather than the resin name alone.
A common PPGL route for regular color-coated orders where the approved polyester system fits the project.
Used where the buyer specifies a silicone-modified polyester system over the Al-Zn coated substrate.
A common market description for higher-durability polyester systems; the actual coating specification must come from the approved paint system.
Used where the project specifies a fluoropolymer / PVDF route and its corresponding primer, film, color and processing requirements.
Performance depends on the actual paint chemistry, film build, Al-Zn substrate, exposure environment, forming, maintenance and the warranty basis of the approved system.
Color should be confirmed together with the paint system, gloss, texture and finished product. We can work from RAL references, buyer samples or approved project colors.
Send the RAL reference already specified by the roofing, cladding, panel or project requirement.
Use a retained sheet, approved swatch or buyer sample where repeat-order color continuity matters.
The same color can appear different at another gloss level or texture, so appearance should be approved before production.
For appearance-sensitive orders, confirm the physical approval sample or project color standard before factory release.
The top side carries the visible color, gloss and exposed paint requirement. The back side may use a different back-coat color and film specification. They should not be collapsed into one vague “double-side painted” description.
Confirm paint system, color, gloss, texture and specified dry-film requirement for the visible face.
Primer is part of the approved coating system and should be considered together with topcoat performance and forming.
Confirm back-coat color and film requirement separately where the rear face forms part of the project specification.
Where required, confirm which side receives film, whether it stays during profiling and when it will be removed.
A usable PPGL quotation should connect the Al-Zn substrate, organic coating system and final coil configuration. A color code by itself does not define the delivered material.
| RFQ Item | What to Confirm |
|---|---|
| Galvalume Substrate | Base-steel designation, thickness, width and Al-Zn coating requirement |
| Paint System | PE / SMP / HDP / PVDF or project-specified system |
| Top Side | Color, paint film, gloss, matt or texture |
| Back Side | Back-coat color and film requirement where specified |
| Surface Protection | Protective film if required, plus profiling / removal requirement |
| Coil Configuration | Coil ID, max coil weight, max OD, slit width or CTL requirement |
The factory also needs to know the Al-Zn substrate, paint system, gloss, film requirements and final forming route.
Thickness and width describe the coated strip. Coil ID, maximum coil weight and outside diameter determine whether the finished coil can be loaded and handled by the buyer's equipment.
Send the finished coated-steel size required by the roofing, cladding or panel line.
Include a fixed internal diameter if the decoiler or profiling line requires one.
State any crane, rack, container or uncoiler limit before the factory selects or rewinds the coil.
Add the outer-diameter limit where equipment clearance or storage space is restricted.
PPGL is often corrugated, trapezoidally profiled, bent or used as a sandwich-panel skin after delivery. The paint system and Al-Zn substrate should therefore be reviewed with the actual forming method.
Tell the manufacturer whether the material becomes roofing, wall cladding, panel skin or another formed profile.
Where required, review coating behavior after the specified bend or profiling test rather than only on a flat sample.
Tight bends can reveal paint or metallic-coating issues that were not obvious before forming.
If protective film remains during profiling, confirm that route before mass production.
The final roof or wall profile is where coating damage and color appearance become commercially visible.
PPGL has two important coating layers: the metallic Al-Zn substrate coating and the organic paint system above it. Final factory inspection should not reduce both into one generic “surface check.”
Confirm the substrate route and coating record required by the order before relying on the painted face as proof of the underlying metallic coating.
Use the agreed coating-thickness test route for top and back paint instead of a mechanical caliper.
Compare the production material with the approved physical reference or project standard together with the agreed gloss or texture.
Paint batch, gloss, texture, production lot and approved reference all matter where repeat-order color continuity is important.
The original broad face carries paint over the Al-Zn metallic coating. Factory slitting creates a new exposed edge, so width, burr, edge damage and surface protection should be reviewed after processing.
Use the width required by the buyer's roofing accessory, trim, panel or narrow profiling line.
Check the new cut edge where burr or local paint damage could remain visible or affect later forming.
Finished slit coils should remain stable and aligned without avoidable abrasion between painted surfaces.
Slitting changes width, not the original Al-Zn substrate, paint-system and approved-color identity.
Protective film can be useful for appearance-sensitive PPGL, but it should be selected together with the actual paint surface, profiling route and removal process.
Confirm whether film is required on the visible top side or another specified face.
Film compatibility should be checked with the actual finish rather than assumed from the color name.
Tell the factory if the film must remain through corrugating, roll forming or panel production.
Removal conditions belong to the approved protective-film system and buyer process, not a generic PPGL rule.
PPGL has an organic painted face, but wet packaging can still create problems at coil edges, slit edges, damaged paint areas and between tightly packed surfaces. Packing should protect the material without sealing obvious moisture inside.
Do not close visible rainwater or process water inside the finished package.
Damaged painted edges and fresh slit edges need extra attention before wrapping and shipment.
Temperature changes during shipment can create moisture even when the factory packed the coil dry.
Painted surfaces can be marked by movement and trapped moisture when coils or separators are not stable.
PPGL traceability needs more than an MTC. The base steel, Al-Zn metallic coating, paint system, approved color reference and finished painted-coil identity should remain connected after coating and slitting.
A buyer should be able to connect the delivered coil to its Al-Zn substrate route and the approved color / paint reference, not just one of them.
A PPGL steel coil supplier should pack appearance-sensitive material differently from bare Galvalume coil. Paint protection, edge protection, dry wrapping and stable coil support all matter.
Use clean contact materials and protective film where specified to reduce avoidable surface abrasion.
Steel straps should not simply cut into exposed painted edges; practical edge protectors reduce local damage.
Outer wrapping should reduce water entry without sealing obvious moisture inside the package.
Skids, saddles, coil-eye protection and loading orientation should fit the finished coil size and shipment method.
For buyers who need the 55% Al-Zn-Si metallic-coated substrate without the added organic paint system.
View Galvalume Steel Coil →For prepainted coil built on a galvanized zinc-coated substrate rather than Galvalume.
View PPGI Steel Coil →For buyers who need profiled roofing or cladding sheet rather than flat painted coil.
View Roofing Sheet →For GI, Galvalume, PPGI, PPGL and related metallic or organic coated-steel routes.
View Coated Steel →PPGL uses a Galvalume / Al-Zn alloy-coated substrate before painting, while PPGI uses a galvanized zinc-coated substrate. The same paint color does not make the two materials interchangeable.
This page is centered on the conventional ASTM A792 Type 1 55% Al-Zn-Si Galvalume / Aluzinc route. Any different metallic-coating chemistry should be confirmed separately before quotation.
Yes. Color can be discussed from RAL references, approved physical samples or project-specific standards. Screen colors shown on the website are visual references only.
PE, SMP, HDP and PVDF are common procurement routes we can discuss. The final primer, topcoat, back coat and film specification should be confirmed from the approved coating system.
Yes, where the painted finish and downstream process support it. Confirm film side, gloss / matt / texture, profiling route and removal conditions before production.
Send the previous approved physical sample or swatch, RAL or project color reference, and the previous paint-system / gloss requirements where available.
Galvalume substrate, thickness, width, paint system, color, quantity and destination are enough to start. Add Al-Zn coating, top/back paint, gloss, protective film, coil ID, slit width or packing details where required.
