GI & GL Substrates – Color coated coils available on galvanized and aluminum-zinc coated steel.
Custom Metallic Coating – Z30–Z275 and other project-specific coating requirements can be discussed.
PE SMP HDP PVDF – Multiple paint systems for different durability and weathering requirements.
Custom RAL Colors – Color, gloss, texture, thickness, width and coil weight can be customized.
Complete Export Documents – MTC, COO and complete commercial and shipping documentation available.
Color Coated Steel Coil is metallic-coated steel that receives a factory-applied paint system before being formed into finished roofing sheets, wall panels, sandwich panels, ceilings, doors, appliances and other manufactured products.
Depending on the substrate, the product can be supplied as prepainted galvanized steel, commonly known as PPGI, or prepainted aluminum-zinc coated steel, commonly known as PPGL.
Henan GDD supplies color coated coils with customized steel grade, metallic coating, paint system, top and back coating thickness, RAL color, gloss, texture, width and coil weight.
For accurate procurement, buyers should consider the complete coating structure rather than comparing suppliers only by nominal thickness and color. Two coils that are both described as “0.50 mm RAL 9003 color coated steel” may use different substrates, zinc coatings, paint systems and coating thicknesses.
| Item | Specification |
|---|---|
| Product Name | Color Coated Steel Coil / Prepainted Steel Coil |
| Product Types | PPGI / PPGL / Customized Prepainted Coated Steel |
| Substrate | Hot-Dip Galvanized Steel / Galvalume or Al-Zn Coated Steel |
| Common Grades | DX51D, DX52D, S250GD, S280GD, S320GD, S350GD, SGCC, SGCH or Equivalent |
| Common Standards | EN 10169, EN 10346, ASTM A755/A755M, JIS G3312 or Customer Specification |
| Thickness | Approximately 0.12 – 1.20 mm or Customized According to Grade and Production Capability |
| Width | Approximately 600 – 1250 mm or Customized |
| GI Zinc Coating | Commercially Approximately Z30 – Z275 g/m² Total Both Sides or Customized According to Applicable Specification |
| Common Zinc References | Z30, Z40, Z60, Z80, Z100, Z120, Z140, Z180, Z200, Z225, Z275 or Agreed Coating Mass |
| PPGL Metallic Coating | Al-Zn Coating Such as AZ50 – AZ180 or Customized According to Specification |
| Metallic Coating Structure | Normally Double-sided; Differential or Special Single-side Requirements Subject to Mill Capability |
| Paint System | PE, SMP, HDP, PVDF or Customized Organic Coating |
| Top Coating | Typically 10 – 35 μm or Customized According to Paint System and Application |
| Back Coating | Typically 5 – 25 μm or Customized |
| Color | RAL Colors / Customer Color Sample / Customized Color Matching |
| Surface Finish | Glossy, Semi-gloss, Matte, Wrinkle, Textured, Wood Grain, Printed or Customized |
| Coil ID | 508 mm / 610 mm or Customized |
| Coil Weight | Typically 3 – 8 MT or Customized According to Production-line Capacity |
| Processing | Slitting, Cut-to-length, Corrugating, Profiling and Customized Processing |
| Applications | Roofing, Wall Cladding, Sandwich Panels, Ceilings, Doors, Appliances, Prefabricated Buildings and Roll-formed Profiles |
| Inspection | Dimensions, Metallic Coating, Paint Thickness, Color, Gloss, Surface, Mechanical Properties and Third-party Inspection Where Required |
| Available Documents | MTC, Certificate of Origin, Export License Where Applicable, Commercial Invoice, Packing List, Bill of Lading and Customs Documents |
| Packing | Waterproof Wrapping, Protective Steel Sheet, Edge Protectors, Steel Straps and Seaworthy Export Packing |
| Trade Terms | EXW, FOB, CFR, CIF |
Final availability depends on substrate grade, thickness, width, metallic coating, paint system, color and production quantity. Commercial coating terms such as Z30 and Z40 should be confirmed together with the actual coating mass in g/m² and the applicable purchasing specification.
Color Coated Steel Coil is a factory-finished steel product in which a metallic-coated substrate receives chemical pretreatment, primer and one or more organic coating layers before being recoiled.
The color is therefore part of an engineered coating system rather than paint simply sprayed onto finished steel sheets.
The resulting material can be directly fed into roll-forming, panel-making, cutting and fabrication equipment, allowing manufacturers to produce finished colored components without a separate painting process after forming.
Color Coated Steel Coil is a broader product category than PPGI.
PPGI normally refers to prepainted galvanized steel, where the metallic substrate is zinc-coated GI steel.
PPGL refers to prepainted Galvalume or aluminum-zinc coated steel, where an Al-Zn metallic coating is used beneath the paint system.
Both can be produced in similar RAL colors and paint systems, but their metallic substrates, appearance at cut edges and corrosion behavior are different.
A color coated coil contains several functional layers rather than only a base metal and one paint layer.
On a typical PPGI product, the exposed side consists of steel substrate, zinc coating, pretreatment, primer and finish coat. The reverse surface normally contains steel, zinc, pretreatment and a back coating.
Each layer has a separate purpose. Steel provides structural strength, zinc provides metallic corrosion protection, pretreatment supports paint adhesion, primer provides an interface and additional protection, and the finish coat determines final color, gloss and weather resistance.
Color coated galvanized steel begins with a GI coil that already meets the required thickness, width, grade and zinc coating specification.
The appropriate galvanized substrate is selected according to steel grade, thickness, zinc coating and final application.
Surface oil, dust and contaminants are removed so that the subsequent coating layers can bond consistently.
A controlled chemical pretreatment prepares the zinc surface and improves adhesion between the metallic coating and primer.
Primer is applied to support paint adhesion and contribute to the protective coating system.
PE, SMP, HDP, PVDF or another specified paint system is applied to the exposed surface in the required color.
The reverse side normally receives its own coating system, which can differ in thickness and formulation from the top surface.
The coated strip passes through controlled curing ovens so that the coating reaches the required film properties and adhesion.
Color, gloss, paint thickness, surface condition and other agreed properties are inspected before recoiling.
The finished Color Coated Steel Coil is recoiled and protected for downstream manufacturing or international shipment.
Galvanized Steel Coil uses zinc as its principal surface protection and normally has a silver-gray metallic appearance.
Color Coated Steel Coil adds pretreatment, primer and organic coatings over a metallic-coated substrate.
This gives the finished material its color while adding another barrier between the environment and the metallic coating.
GI is commonly used for HVAC ducts, framing, fabrication and products where decorative color is unnecessary. Color coated material is widely used where the finished surface remains visible, such as roofing, cladding and sandwich panels.
The organic paint and zinc coating perform different functions.
Paint creates an environmental barrier and provides the required appearance. Zinc remains beneath the paint and provides metallic protection to the steel substrate.
This becomes particularly relevant around cut edges, small scratches and areas where forming may locally affect the coating system.
As a result, two color coated coils with the same paint specification but substantially different zinc coatings should not automatically be considered equivalent.
Conventional hot-dip galvanized substrate used for PPGI is normally zinc coated on both surfaces.
Where the coating designation represents total coating mass, the value usually refers to the combined zinc on both sides according to the applicable specification.
If a nominal 100 g/m² total coating is distributed approximately equally, it corresponds to roughly 50 g/m² on the top surface and 50 g/m² on the bottom surface.
The actual distribution remains subject to coating-line control and standard tolerances.
True single-sided galvanizing is a specialized product rather than the normal substrate for Color Coated Steel Coil.
In this configuration, one surface receives a specified zinc coating while the other remains uncoated or receives another treatment.
Customers requesting a single-sided product should clearly identify the coated side, zinc mass and required condition of the opposite surface.
Availability depends on the coating route and mill capability and should therefore be confirmed before quotation.
Differential coating is different from true single-sided galvanizing.
Both sides remain zinc coated, but the coating mass is intentionally different between Side A and Side B.
This can be specified when the external surface requires greater metallic protection than the protected reverse side.
Because differential coating is not available from every production line, the required g/m² on each side should be stated separately.
Z30 is frequently used in export quotations as a commercial description for approximately 30 g/m² total zinc coating across both surfaces when the supplier and buyer define it that way.
For an approximately equal-coated product, that would correspond to roughly 15 g/m² on each side.
Z30 is a relatively light coating and is generally considered for cost-sensitive or protected applications rather than severe outdoor exposure.
It is important to note that Z30 is not a formal coating class under every international steel standard. Buyers should therefore confirm the actual total coating mass rather than relying only on the shorthand term.
Z40 is also commonly encountered as a commercial description, generally referring to approximately 40 g/m² total zinc coating when defined that way in the purchase specification.
With approximately equal distribution, this would be around 20 g/m² on each surface.
Like Z30, Z40 should be treated as a light metallic coating and should only be selected when appropriate for the service environment and customer specification.
Under commonly used EN-style coating terminology, Z100 represents a nominal total zinc coating mass of approximately 100 g/m² across both surfaces.
If approximately equally distributed, this corresponds to around 50 g/m² on each surface.
Z100 is widely requested for general PPGI roofing, cladding and building-material production where more metallic protection is required than very light commercial coatings.
Z275 represents a significantly heavier zinc coating, with approximately 275 g/m² nominal total coating under commonly used EN-style terminology.
A heavier metallic coating provides more zinc available for corrosion protection, but the final service performance of Color Coated Steel Coil also depends on paint quality, environment, cut edges, forming, installation and maintenance.
The most suitable zinc coating is therefore the one that matches the technical requirement rather than simply the highest available number.
Coating designations from different standards should not be compared by number alone.
EN-style zinc designations are commonly discussed in grams per square metre, while ASTM galvanized coatings use a different designation system such as G30, G60 and G90.
A commercial Z40 quotation should therefore never be automatically treated as ASTM G40. The actual coating mass and applicable material standard should be reviewed.
The appropriate zinc coating depends on service conditions and the complete coating system.
Indoor decorative panels and protected manufacturing components may not require the same metallic coating as exposed roofing.
Outdoor humidity, industrial pollution, salt exposure, project lifetime, paint system and maintenance expectations should all be considered.
For engineered projects, the specified metallic coating should not be reduced purely to lower purchase cost without technical approval.
PPGI uses hot-dip galvanized steel as its metallic-coated substrate.
It is one of the most common forms of Color Coated Steel Coil and is widely used for roofing, wall panels, sandwich panels and general building products.
Typical specifications combine a DX51D or structural galvanized substrate with a defined zinc coating and a PE, SMP, HDP or PVDF finish system.
PPGL uses an aluminum-zinc coated steel substrate rather than conventional zinc-coated GI.
A commonly traded Galvalume-type substrate contains an aluminum-zinc metallic coating and can be used under similar prepainting processes.
PPGL is frequently selected for roofing and cladding applications, but it should not automatically be substituted for PPGI without checking forming, corrosion, cut-edge and project requirements.
The main difference is underneath the paint.
PPGI uses galvanized zinc-coated steel, while PPGL uses an aluminum-zinc coated substrate.
Both can use PE, SMP, HDP or PVDF paint and can be produced in the same RAL color.
Buyers should therefore identify the required metallic substrate separately from the paint color and coating system.
Polyester, or PE, is widely used for general-purpose Color Coated Steel Coil because it provides a practical combination of cost, color range and formability.
PE is commonly selected for standard roofing sheets, interior and exterior panels, ceilings and general building products.
Its actual performance depends on the paint formulation, primer, film thickness, substrate and service environment.
Silicone Modified Polyester is used where buyers require different weathering or hardness characteristics from conventional general-purpose polyester.
SMP is commonly considered for exterior roofing and wall products.
Performance varies between paint formulations, so the abbreviation SMP alone should not replace the agreed coating specification.
High Durability Polyester is designed for applications requiring improved exterior durability compared with standard PE systems.
It is often considered for roofing and cladding where weather resistance and long-term appearance are important.
HDP can provide a practical option between standard polyester and more specialized architectural coating systems depending on the project.
PVDF coating is frequently specified for architectural projects requiring strong long-term weathering and color-retention performance.
Typical applications include exterior cladding, façade systems and higher-value roofing projects.
Because PVDF normally costs more than basic PE, coating selection should reflect the actual service environment rather than simply selecting the highest-cost paint system.
The appropriate paint system depends primarily on exposure conditions, expected service life and required appearance.
General-purpose building products commonly use PE. Projects requiring greater outdoor durability can consider SMP or HDP, while selected demanding architectural applications may specify PVDF.
UV exposure, humidity, industrial atmosphere, coastal conditions, color-retention requirements and customer specifications should all be reviewed before selection.
The two surfaces of Color Coated Steel Coil do not necessarily use the same organic coating thickness.
The exposed side normally receives primer and a decorative finish coat, while the reverse side receives a back coat selected according to the application.
Standard building-material products often use a thinner coating on the reverse side, but projects exposed to condensation or aggressive environments may require a different back-coat specification.
Buyers should therefore specify both front and back coating requirements when they are critical to the finished application.
Paint-film thickness influences coverage, appearance and barrier protection.
However, a higher micrometre value alone does not guarantee better coating performance.
Surface pretreatment, primer, paint chemistry, curing, adhesion and metallic substrate all contribute to the finished coating system.
Comparing two suppliers only by “20 μm vs 25 μm” without reviewing the complete coating construction can therefore be misleading.
RAL color references provide a convenient way for international buyers to communicate required colors.
Common roofing and building-material colors include white, gray, blue, red, green and brown shades.
The visible result can still vary slightly with gloss, texture, paint chemistry and lighting conditions.
For projects requiring tight color consistency, a physical approved sample should be used as the production reference.
Smooth glossy surfaces are only one option for prepainted steel.
Matte, low-gloss, wrinkle and textured coatings can create a different architectural appearance and are often used for roofing, wall panels and decorative applications.
Surface texture can change how a color looks under natural light, making sample confirmation useful before large production runs.
Wood-grain patterns can be applied to selected color coated steel products for doors, decorative panels and interior or exterior building components.
These products combine the appearance of wood with a coated-steel substrate.
Pattern, color, repeat length, gloss and final surface should be confirmed using an approved design or sample.
Roofing manufacturers convert master coils into corrugated, trapezoidal, tile-profile and other roofing sheets using continuous roll-forming equipment.
Key material parameters include substrate grade, thickness, metallic coating, paint system, coating thickness, color, width and coil weight.
Roll-forming performance should also be considered because a coating system must withstand the required bending and forming without unacceptable cracking or delamination.
Wall panels cover large visible areas, so appearance consistency can be particularly important.
Color difference between production batches may become visible when panels are installed directly next to each other.
Projects with large façades should therefore plan batch quantities and color-control requirements before ordering.
Sandwich-panel production uses coated steel facings combined with insulation cores such as EPS, PU, PIR or mineral wool.
Exterior and interior surfaces can require different colors and coating specifications.
The coating system should also be suitable for the customer's panel bonding and production process.
Prefabricated warehouses, workshops, cabins and modular buildings frequently use color coated steel for roof and wall systems.
Using factory-finished material allows manufacturers to produce large quantities of panels without painting them after profiling.
For multi-product projects, roof panels, wall panels and trims can be coordinated around the same approved color family.
A useful purchase specification should contain considerably more information than “PPGI 0.5 mm blue.”
Buyers should identify substrate type, steel grade, thickness, width, zinc or Al-Zn coating, paint system, top and back coating thickness, RAL color, gloss or texture, coil ID, preferred coil weight and quantity.
The final application should also be included because roofing, façade panels, sandwich panels and appliances can require different coating constructions.
When replacing an existing supplier, sending the existing MTC, coil label or technical specification is often the fastest way to compare products accurately.
Two RAL 9003 coils can use different metallic substrates, zinc coatings and paint systems even though they appear similar.
Paint does not eliminate the importance of zinc or Al-Zn beneath it.
A total coating specification generally does not mean the same coating mass is required independently on both sides.
These terms are frequently used commercially, but the actual g/m² requirement should be confirmed because designation practice can vary.
Condensation and humidity can affect the reverse side of roofing and panels, making back-coat specification relevant in some applications.
The finished coil must remain within the customer's crane and decoiler capacity.
A typical roofing manufacturer may purchase DX51D PPGI in several RAL colors for corrugated and trapezoidal panel production.
The buyer's main concerns are actual thickness, zinc coating, PE or other paint system, coil width and maximum coil weight.
When several colors run through the same roll-forming line, keeping the mechanical properties and coil dimensions consistent helps simplify production adjustments.
A building-envelope project may require greater attention to long-term color stability and weather exposure.
In this situation, a higher-performance paint system such as HDP or PVDF may be considered together with an appropriate metallic coating.
Physical color samples are useful when several production batches will be installed on the same façade.
A sandwich-panel factory may purchase different thicknesses and colors for exterior and interior panel skins.
Coil width, surface condition, paint adhesion, forming behavior and compatibility with the production line are reviewed in addition to price.
A regional distributor may stock common RAL colors together with several thicknesses for roofing contractors and fabricators.
Standardized coil weights, clear labels and traceable specifications make inventory management easier when several coating configurations are stored in the same warehouse.
These cases describe typical purchasing and processing scenarios. Customer names, confidential prices and proprietary specifications are not published without authorization.
After a color coated product has been approved on a production line, consistency becomes one of the main purchasing priorities.
Repeat buyers commonly check actual thickness, width, metallic coating, color difference, gloss, paint thickness, surface condition, bending performance, coil weight and packing quality.
For visible building projects, maintaining color consistency between separate batches can be particularly important.
Inspection can include steel thickness, width, metallic coating information, paint-film thickness, color, gloss, surface appearance and mechanical properties according to the purchase specification.
Surface checks identify scratches, dents, coating damage, contamination, edge defects and other visible conditions.
Where required, coating adhesion, bending or additional performance tests can be reviewed according to the applicable standard and agreed inspection plan.
Product photographs, coil-label photographs, packing photographs and container-loading photographs can be provided according to customer requirements.
Material documentation helps confirm that the delivered coil corresponds to the agreed steel and metallic-coating specification.
Depending on the material and mill documentation, the MTC can include grade, dimensions, coating designation, mechanical properties, coil identification and other relevant production information.
Coil labels provide traceability between the physical material and corresponding documentation.
Customers requiring specific certificate information should confirm it before production and shipment.
Independent third-party inspection can be arranged according to the scope agreed in the purchase contract.
Inspection may include dimensions, color, surface condition, coating information, markings, quantity, documentation, packing and loading.
Additional laboratory tests should be agreed before production so that the test method, sampling plan and acceptance criteria are clearly defined.
Henan GDD supports international Color Coated Steel Coil shipments with technical, commercial and customs documentation prepared according to contract and destination requirements.
Available documents can include MTC, Certificate of Origin, export license where applicable, commercial invoice, packing list, bill of lading and customs declaration documents.
Product photographs, coil-label photographs, inspection photographs, packing photographs and container-loading photographs can also be supplied according to agreed requirements.
Destination-specific certification, chamber endorsement, legalization and other special import-document requirements should be confirmed before order placement.
Color coated coils require reliable protection against moisture, impact and surface scratching during international transportation.
Packing can include waterproof material, protective steel sheets, inner and outer edge protectors, reinforced steel straps and suitable supporting skids.
Labels can identify grade, dimensions, metallic coating, color, coil number, net weight, gross weight and customer shipping marks.
Container loading should also consider individual coil weight and appropriate securing to reduce movement during shipment.
Henan GDD supplies Color Coated Steel Coil to roofing manufacturers, sandwich-panel factories, steel distributors, prefabricated-building producers and industrial fabricators.
We support both PPGI and PPGL substrates together with PE, SMP, HDP and PVDF paint systems, RAL colors and customized coil specifications.
For buyers comparing Z30, Z40, Z100 or Z275 substrates, the actual metallic coating in g/m² can be reviewed before quotation to reduce ambiguity.
Existing MTCs, coil labels, purchase specifications and physical color samples can also be reviewed when customers are changing suppliers.
Our related supply range includes GI Steel Coil, Galvanized Steel Sheet, PPGI, PPGL and Galvalume Steel Coil, allowing customers to consolidate coated-steel procurement where appropriate.
MTC, Certificate of Origin, export license where applicable and complete commercial and shipping documentation can be provided according to contract requirements.
Color Coated Steel Coil is metallic-coated steel that receives pretreatment, primer and factory-applied finish coatings before being recoiled for downstream manufacturing.
PPGI is one type of Color Coated Steel Coil. Color coated steel can also use an aluminum-zinc coated substrate, which is commonly sold as PPGL.
Galvanized coil mainly uses a zinc metallic coating, while color coated coil adds pretreatment, primer and organic paint layers over a metallic-coated steel substrate.
Standard hot-dip galvanized substrate used for PPGI is normally coated with zinc on both sides. Single-sided or differential coating should be treated as a special specification.
In many commercial quotations, they are used to describe approximately 30 g/m² and 40 g/m² total zinc coating respectively when defined that way by buyer and supplier. Because the terminology is not universal across every standard, the actual g/m² value should always be confirmed.
Normally no. Under commonly used EN-style terminology, Z100 refers to approximately 100 g/m² nominal total coating across both surfaces.
PE is widely used for general building applications. SMP and HDP can be considered where improved outdoor durability is required, while PVDF is commonly specified for demanding architectural applications requiring stronger weathering and color-retention performance.
Yes. Standard RAL colors and customized color matching can be supplied. Physical sample confirmation is recommended when strict color consistency is required.
Yes. MTC, Certificate of Origin, export license where applicable, commercial invoice, packing list, bill of lading and other agreed export documents can be provided.
Please provide substrate type, steel grade, thickness, width, zinc or Al-Zn coating, paint system, top and back coating thickness, RAL color, gloss or texture, coil ID, preferred coil weight, quantity, destination port and required documents.
Looking for Color Coated Steel Coil for roofing, wall cladding, sandwich panels, prefabricated buildings or industrial manufacturing?
Send Henan GDD your required substrate, grade, thickness, width, metallic coating, paint type, coating thickness, RAL color, surface finish, coil ID, coil weight, quantity, destination port and documentation requirements.
If your current specification only states information such as "0.45 mm color coil, Z40, RAL 9002," you can also send the existing MTC, coil label or supplier specification. We can review the substrate, metallic coating and paint construction before preparing a quotation.
