Color-coated steel coil and sheet for PU, PIR, EPS and rockwool sandwich panel production, with custom thickness, width, topcoat and reverse-side coating options.
Sandwich Panel Applications
Material structures can be adjusted for different panel cores, exterior conditions and production-line requirements.
PU and PIR Panel Skins
Exterior and interior steel skins for continuous or discontinuous foam-panel production.
EPS Panel Skins
Color-coated steel for bonded EPS wall, roofing and enclosure panels.
Rockwool Panel Skins
Steel skins for fire-resistant wall and roofing panel systems using adhesive bonding.
Cold Room Panel Skins
Outer and inner steel surfaces selected according to temperature, humidity and cleaning requirements.
Supply Specifications
Final values are confirmed according to the panel type, core, line width, forming profile and commercial requirements.
Quotation control: state whether thickness means base-metal or finished thickness. Also provide the core type, panel-line width, coil ID and maximum coil weight.
| Product | Prepainted galvanized or Al-Zn coated steel coil and sheet |
|---|---|
| Thickness | According to panel design, profile and line requirement |
| Width | Master or slit width according to the panel line |
| Steel Grade | Commercial forming or structural grade |
| Metallic Coating | GI or PPGL according to project environment and specification |
| Topcoat Systems | PE, SMP, HDP or PVDF |
| Color | RAL color or approved physical sample |
| Reverse Side | General or bonding-compatible coating subject to process confirmation |
| Coil ID and Weight | According to the continuous or discontinuous panel line |
| Supply Form | Master coil, slit coil or cut sheet |
| Documents | MTC, packing list and agreed inspection records |
Outer Skin and Inner Skin Requirements
The two steel faces may use different coating structures because they perform different jobs in the finished panel.
Weathering, Color and Forming
- UV and exterior exposure
- Color and gloss retention
- Corrosion environment
- Profile forming and T-bend
- Protective film and surface handling
Bonding, Cleaning and Interior Exposure
- Visible or concealed interior face
- Humidity and condensation
- Cleaning and chemical exposure
- Adhesive or foam compatibility
- Color and surface requirement
Do not assume the same reverse-side coating works for every panel. PU, PIR, EPS and rockwool systems may use different foam, adhesive, curing and line conditions. For hygienic and controlled-environment surfaces, review our laminated steel for cleanroom panels page.
Reverse-Side Coating and Core Compatibility
This is one of the most important technical controls in sandwich panel production.
Core and Adhesive Review
Confirm the core material, foam chemistry, adhesive, curing temperature and line speed.
Sample Preparation
Prepare steel samples using the proposed reverse-side coating and production structure.
Bonding Trial
Test with the actual panel-line foam or adhesive system.
Adhesion Evaluation
Review peel, bond failure mode and any thermal or aging requirement.
Mass Production Approval
Lock the steel, coating and process specification before bulk production.
Topcoat Options
The exposed coating should be selected according to weathering, forming, color-retention and budget requirements.
Polyester
Economical general-purpose coating with good forming direction for standard panel applications.
Silicone-Modified Polyester
Improved hardness and weathering direction compared with standard PE.
High-Durability Polyester
Selected where stronger exterior durability and color retention are required.
PVDF Coating
Premium option for high-UV, coastal or appearance-critical exterior panel projects.
Compare paint systems in the PPGI coating types guide.
Processing and Supply Support
Everest Steel coordinates coating production through long-term partner lines and supports downstream preparation with dedicated slitting and cut-to-length resources.
Application Review
Confirm the panel type, core, exposed environment, profile and production-line limits.
Sample and Specification Approval
Approve color, coating structure, reverse side and bonding test requirements.
Coating and Processing
Coordinate coating, slitting or cut-to-length according to the signed order.
Inspection and Traceability
Check agreed dimensions, color, coating, surface and batch identification.
Packing and Shipment
Protect coil edges and surfaces for export transport and downstream feeding.
Quality Control
Test items and acceptance criteria are confirmed according to the signed steel specification and panel process.
Dimensions
- Thickness basis and tolerance
- Width and slit-width tolerance
- Coil ID and coil weight
Coating Structure
- Metallic coating designation
- Primer and topcoat DFT
- Reverse-side coating
Appearance
- Color and gloss
- Surface defects
- Protective film when required
Performance
- T-bend or agreed bend test
- Adhesion
- Bonding trial when required
Review the prepainted and laminated steel quality-control process.
Information Required for Quotation
A complete inquiry helps us review the steel structure, bonding compatibility, processing and packing.
Technical Details
- Panel type and end application
- Core material: PU, PIR, EPS or rockwool
- Base-metal or finished thickness
- Steel grade and width
- GI or PPGL substrate
- Topcoat system and color
- Reverse-side coating requirement
- T-bend or forming requirement
- Protective-film requirement
Production and Commercial Details
- Continuous or discontinuous panel line
- Coil ID and maximum coil weight
- Foam or adhesive system
- Line speed and curing conditions
- Required quantity by specification
- Sample and inspection requirement
- Packing requirement
- Destination port and Incoterm
Send Your Sandwich Panel Steel Specification
We will review the panel core, coating structure, reverse-side compatibility and supply format before preparing the quotation.
Sandwich Panel Steel FAQ
Can the same steel be used for the outer and inner skins?
Yes, but the exposed-face coating and reverse-side bonding requirements may differ. Outer and inner skins should be specified separately when weathering, cleaning, color or bonding requirements are different.
How should the reverse-side coating be selected?
Review the actual core, foam, adhesive, curing temperature and panel-line conditions. The proposed reverse-side coating should be verified by a bonding trial before mass production.
Which coating is suitable for exterior sandwich panels?
PE, SMP, HDP and PVDF are selected according to forming, UV exposure, corrosion environment, color-retention requirement and budget.
Can slit coils be supplied for continuous panel lines?
Yes. Slit width, coil ID, coil weight and edge condition can be prepared according to the line requirement and signed specification.
What information is needed for sample approval?
Provide the panel type, core, thickness basis, width, substrate, coating, color, reverse-side requirement, foam or adhesive system and target quantity.
Request a Sandwich Panel Steel Quote
Include the panel type, core material, thickness, width, coating, reverse side, coil weight and quantity.
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