Color-coated galvanized coils for bulk panel and fabrication orders
PE, SMP, HDP and PVDF paint systems are available on prepainted galvanized steel coil from 0.15–1.2 mm thick and 600–1,250 mm wide. The exposed-face finish, reverse coating and steel substrate are selected together for the finished panel or formed part.
| Parameter | Range or option | Selection detail |
|---|---|---|
| Catalog thickness | 0.15–1.2 mm | 0.0059–0.0472 in.; rounded conversion |
| Strip width | 600–1250 mm | 23.62–49.21 in.; rounded conversion |
| Paint families | PE, SMP, HDP, PVDF | Organic coil coatings on galvanized steel |
| Exposed-face paint | Specified primer and finish layers | Cured dry-film thickness stated by layer in µm or mil |
| Reverse-side coating | Backer or separately specified decorative finish | Reverse color, layers and cured-film requirement |
| Color reference | RAL color or coated-metal sample | Face color, gloss and reverse finish specified separately |
The quotation pairs the thickness-width combination with the steel grade and zinc coating. The paint schedule identifies primer, exposed-face finish and reverse coating separately, with the cured-film requirement for each specified layer.
A sheltered interior cover and a sun-exposed wall panel need different paint properties. Polyester offers a broad range of formulations; SMP and HDP address more demanding weathering requirements. PVDF is a fluoropolymer option for color-critical architectural surfaces. The actual coating formulation determines the required performance.
A harder finish can resist handling damage yet need a different bend allowance from a more flexible coating. Tight folds, embossed shapes and deep profiles belong in the paint selection. The steel, zinc layer, primer and finish are assessed together for the intended forming operation.
Find a paint family or intended use.
| Paint family | Typical selection context | What the specification controls |
|---|---|---|
| PE — polyester | General sheet fabrication, interior parts and exterior products using an appropriate formulation | Formability, hardness and the required exposure class |
| SMP — silicone-modified polyester | Roofing and wall panels needing a weathering-focused polyester system | Color and gloss retention, abrasion resistance and bend requirements |
| HDP — high-durability polyester | Exposed panels using a higher-weathering polyester formulation | The specified paint product and its exposure and forming requirements |
| PVDF — fluoropolymer | Architectural panels where long-term color and UV resistance drive selection | Resin formulation, color, film schedule and required performance criteria |
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HDP identifies a high-durability polyester family, rather than one universal paint grade. A PVDF description alone does not establish a resin percentage, licensed paint brand or architectural approval.
| Part of the specification | Required identity | Selection basis |
|---|---|---|
| Finished-product specification | ASTM A755/A755M or JIS G 3312 catalog option | Standard and edition stated on the purchase line; A755 covers exterior-exposed building products |
| Base steel | Grade, strength and forming quality | The part design sets the steel properties; a paint color is not a material grade |
| Zinc coating | Substrate specification and coating designation | Zinc mass belongs to the metallic layer, separate from organic paint-film thickness |
| Surface preparation | Compatible pretreatment and primer system | Adhesion depends on preparation and the selected substrate/paint combination |
| Exposed-face paint | Paint family, color and cured-film requirement | Primer, finish coat and total face film identified separately |
| Reverse-side coating | Backer or a specified decorative finish | Concealed-side protection and two-visible-face appearance are different requirements |
| Film acceptance | Layer basis, units and measurement method | Cured dry film stated in µm or mil; 1 mil = 25.4 µm |
Two coils can have the same painted face and different base-metal strength, zinc mass or forming properties. A roofing profile needs the steel grade and thickness required by its design; a drawn cover needs suitable ductility. We keep the substrate specification and the finished coating system together on the quote, with alternatives identified as separate offers.
Review the seven prepainted-coil service-life specifications before reducing the order to a paint-family label.
A RAL number identifies a color target. Screen images do not define the final shade, gloss or texture. A physical coated-metal reference carries those appearance choices into the order, especially when flashing and panels will be seen together.
Panels from separate paint lots can show visible shade or gloss differences. A coordinated coil schedule keeps the paint product, approved color reference and exposed-face orientation together. For repeat orders, the reference and acceptance limits remain part of the specification.
A standard backer protects the concealed face; it is not automatically the same decorative finish as the top. Open-sided parts and assemblies with both faces visible need a separately specified reverse color and finish. The two faces have their own film requirements.
Base-metal thickness excludes both the zinc and organic paint layers. Metal-coated thickness includes the zinc; finished painted thickness includes the paint as well. The ordered decimal thickness, measurement basis and tolerance must match the tooling and part design. Paint-film thickness cannot make up missing base steel.
Clean, aligned rolls and suitable bend geometry reduce scratching and paint damage. A bend-adhesion requirement identifies the method, bend severity and acceptance criteria for the actual coated material. There is no single bend rating that applies to every paint and steel combination.
If tight panel bends damage the finish, the prepainted-coil cracking guide separates material, coating and tooling causes.
Coil inside diameter, maximum outside diameter and individual weight follow the uncoiler’s limits. Painted-face orientation and winding direction control which side enters the forming line as the visible surface. Requested slit widths also need defined burr, camber and width tolerances.
Roll-formed building panels need a substrate and paint system suited to outdoor exposure, the panel profile and the visible color. Cut edges, drilled holes and fastening details remain part of the finished system’s design. Coil coating does not turn an unsuitable substrate into a universal roof material.
Cabinet faces and appliance covers need coating requirements for the specified cleaners, stain exposure and handling abrasion, alongside the approved appearance. Pressed recesses and folded edges are included in the finished-part surface acceptance. The paint system is selected for those conditions rather than an outdoor-panel rating.
Narrow formed trims often combine tight bends with an exposed painted face. Steel formability and paint adhesion matter at folded corners; matching the panel’s color reference and gloss keeps the surrounding trim visually consistent.
Paint-film acceptance distinguishes the primer, finish coat and total system on each side. The agreed method must separate organic paint from the metallic zinc layer. A combined coating reading cannot by itself establish the individual paint-layer thicknesses.
The approved metal reference and agreed color/gloss criteria control appearance acceptance. Surface inspection addresses scratches, roll marks and defects on the specified visible face. The order’s appearance limits determine which marks are acceptable for the finished use.
Forming-sensitive material needs a defined bend test and coating-adhesion criterion. Bend direction, specimen condition and test temperature affect the result. A stated test method without a required result does not define acceptance.
Shipment documents identify the steel substrate, zinc coating, paint system and required inspection results. Coil and required paint-lot records accompany the delivered material.
PPGI prices identify the steel and zinc specification, paint system, face and reverse film requirements, strip size and net-weight unit. Color, preparation, packing and freight are itemized with the production terms.
Painted coils need protection where straps, covers and supports contact the finish. The packing specification covers the eye, exposed edges, outer wrap and securing method. Required coil identification and color-lot references are listed in the order’s marking schedule for receiving and panel allocation.
Moisture trapped between painted wraps can damage adhesion or cause corrosion beneath the coating. Dry covered storage and controlled condensation matter before the coil reaches the forming line. Wet wrapping is addressed promptly on receipt; paint is not a substitute for dry handling.
No. PPGI uses a galvanized zinc-coated steel substrate; PPGL uses aluminum-zinc-coated steel. This page’s dimensional program is PPGI. A PPGL requirement has a separate substrate and finished coating specification rather than inheriting the PPGI ranges.
An original paint or RAL code is a starting point, but weathered panels can differ from their original color. A current physical sample and agreed color/gloss criteria provide a better matching basis. New metal and aged panels are not automatically an exact visual match.
No. Accelerated exposure tests compare defined specimens under a stated method and evaluation criterion. Test hours do not convert directly into years outdoors. Any required paint warranty has its own product, location, exposure and written terms.
Protective film is a separate preparation request with its own quoted scope. Film choice depends on compatibility with the painted face, the forming sequence and storage exposure. The accepted film specification states its removal conditions; temporary film is not a permanent outdoor finish.
Send your PPGI schedule, finish reference and destination. We quote the substrate, zinc coating, strip sizes and quantities with the paint system, face and reverse finish, and packing requirements.