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Sandwich Panel

Engineered Structural & Insulated Sandwich Panels for Industrial Enclosure Systems

Sandwich Panels combine high-strength metallic or composite outer facings (prepainted galvanized steel, Galvalume, aluminum, or fiberglass) with specialized structural or insulation core materials using automated continuous thermal lamination. Engineered as an all-in-one building envelope component, these panels integrate structural load-bearing capacity, thermal resistance, air-tightness, and fire protection into a single factory-controlled modular element.

Applied across industrial manufacturing plants, cold chain logistics hubs, pharmaceutical cleanrooms, and commercial vehicle bodies, these composite panels eliminate site insulation labor, prevent thermal bridging, and significantly reduce construction timelines while maintaining structural integrity under high wind loads.

Truck Body Sandwich Panel
Significant weight reduction: 6–8 kg/m² at 20 mm (FRP+PP honeycomb) — 50–70% lighter than steel or solid FRP.
Increased payload & fuel savings: every 100 kg saved directly translates to more...
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PP Core Fiberglass Sandwich Panel
Fiberglass Face Skins: E-glass (standard), ECR-glass (corrosion-resistant), S-glass (high strength)
Fabric Type: Woven roving (WR 400-800 g/m2), CSM (300-450 g/m2), biaxial stitched...
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Foam Sandwich Panel
Product Name: Foam Sandwich Panels
Thinckness: 3-50mm
Material : PU foam, XPS foam, EPS foam, Galvanized steel, aluminum alloy, FRP
Density: 50-80 kg/m³
Use: Aircraft &...
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PU Foam Sandwich Panel
Products Description PU foam sandwich panel is a composite building material consisting of two metal facings and a rigid polyurethane foam core. It offers excellent thermal insulation, making it...
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Aluminium Sandwich Panel
Aluminium Sandwich Panel is super versatile-you can use it for building curtain walls, sprucing up interior walls, or cladding exterior walls, it works like a charm every time.
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PVC Sandwich Panel
Product Name: PVC Sandwich Panels
Thinckness: 3-50mm
Material: PVC foam, XPS foam, EPS foam, Galvanized steel, aluminum alloy, FRP
Density: 50-80 kg/m³
Use: Aircraft &...
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Carbon Fiber Sandwich
Product Name: Carbon Fiber Sandwich
Material: CFRP
Fire Resistant Level: A
Weight: 1.7 - 2.0 g/cm³
USE: Civil Engineering & Architecture (e.g., seismic retrofit of...
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Fibreglass Sandwich Panel
If you're on the hunt for lightweight, tough, and corrosion-proof composite panels for your construction, transportation, or chemical projects—stop right here! Fibreglass sandwich panels are...
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Product Categories

Structural Fire-Rated Rockwool Sandwich Panels

Engineered for industrial exterior walls, standing-seam roof cladding, and interior fire-separation partitions requiring non-combustible protection. Utilizes high-density structural basalt rockwool slitted and turned 90 degrees (lamella orientation) to orient fibers perpendicular to the steel facings, maximizing compressive and shear resistance.
Core Material: Non-Combustible Mineral Rockwool (Density: 100 kg/m3 to 140 kg/m3)
Facing Thickness: 0.5 mm to 0.8 mm Prepainted Galvanized Steel (PPGI) / Galvalume (PPGL)
Key Feature: Certified Class A1 fire resistance with zero flame spread and smoke emission; pre-filled joint sealant gaps prevent liquid water penetration.

High-Efficiency PIR / PUR Insulated Panels

Optimized for cold storage facilities, deep-freeze rooms, pharmaceutical cleanrooms, and food processing plants requiring low thermal conductivity and airtight construction. Formulated using pentane blowing agents with zero ozone depletion potential (ODP).
Core Material: Rigid Polyisocyanurate (PIR) / Polyurethane (PUR) Foam (Density: 40 kg/m3 to 45 kg/m3)
Standard Panel Thickness: 50 mm, 75 mm, 100 mm, 120 mm, 150 mm, 200 mm
Key Feature: Closed-cell structure exceeding 95% provides high thermal resistance (R-value) with precise tongue-and-groove joint interlocking.

Lightweight Commercial Vehicle & FRP Composite Panels

Engineered for refrigerated truck bodies, dry freight van trailers, and prefabricated modular housing. Features lightweight fiberglass-reinforced plastic (FRP) skins bonded to rigid extruded polystyrene or polypropylene honeycomb cores.
Core Material: XPS / PU / Polypropylene (PP) Honeycomb Core
Surface Facing: 1.5 mm to 3.0 mm High-Gloss Gel-Coated FRP Sheet
Key Feature: Corrosion-resistant, impact-absorbing non-metallic structure that cuts overall vehicle body weight by up to 40%.

Materials & Specifications

Technical Parameter	Metric Specification	Test Standard / Method
Panel Thickness Range	50 mm, 75 mm, 100 mm, 120 mm, 150 mm, 200 mm	ISO 1923
Steel Facing Specification	PPGI / PPGL / Stainless Steel 304 (0.4 mm to 0.8 mm)	EN 10346 / ASTM A653
Zinc / AZ Coating Gauge	Z100 - Z275 / AZ70 - AZ150	ISO 1461
Coating Systems	Polyester (PE), PolyPVDF, High-Durable Polyester (HDP)	EN 10169
Core Thermal Conductivity	PIR: 0.020 - 0.022 W/m.K / Rockwool: 0.038 - 0.042 W/m.K	EN 12667 / ASTM C518
Compressive Strength	PIR: Greater than or equal to 150 kPa / Rockwool: Greater than or equal to 100 kPa	EN 826
Shear Strength (Core)	PIR: Greater than or equal to 0.12 MPa / Rockwool: Greater than or equal to 0.08 MPa	EN 14509
Fire Reaction Rating	Rockwool: Class A1 / PIR: Class B-s1, d0	EN 13501-1 / ASTM E84
Water Vapor Permeability	PIR Foam: Closed-cell ratio greater than or equal to 95%	ISO 1663
Joint Profile Options	Tongue & Groove, Secret Joint (Hidden Fastener), Cam-Lock	Manufacturer Standard

Applications

Industrial & Commercial Building Envelopes

Exterior wall cladding, standing-seam roof panels, and internal partition walls for warehouses, steel mills, and distribution centers.

Temperature-Controlled & Cleanroom Facilities

Walk-in freezers, cold storage logistics hubs, agricultural processing plants, and pharmaceutical cleanroom enclosures.

Commercial Transport & Modular Housing

Refrigerated truck bodies, dry freight containers, site office accommodations, and prefabricated modular building units.

OEM / Customization Capabilities

Profile & Surface Forming Options:
Exterior Facings: Micro-ribbed, wide-ribbed, flat, corrugated roof rib (3-rib or 5-rib profile)
Internal Facings: Smooth, linear micro-embossed, cleanroom flat finish
Edge Profiling: Pre-milled tongue-and-groove joints, factory-applied PVC gaskets, and integrated cam-lock connectors for modular cold rooms

Steel Surface Protective Coatings:
Anti-corrosive PVDF paint systems for coastal or high-chemical environments
Anti-bacterial film-laminated steel facings for food-grade cleanrooms
Stainless steel (Grade 304 or Grade 316) facings for high-salinity or washdown zones

Length Sizing & Dimensional Tolerances:
Custom panel lengths up to 13.5 meters (matching 40ft HQ container shipping limits)
Panel width: 1000 mm, 1120 mm, or 1150 mm effective coverage width
Length cutting tolerance: +/- 2.0 mm
Thickness tolerance: +/- 1.0 mm

Quality Control & Manufacturing Process

Production Workflow
Coiled Steel Uncoiling, Surface Corona Treatment & Roll Forming
Core Material Feed (Continuous PU/PIR Injection or Lamella Rockwool Placement)
Automated Continuous Double-Belt Press Curing & Thermal Lamination
Flying Saw Cutting to Custom Length Specifications
Cooling Conveyor Aging & Panel Stacking
PE Protective Film Application, Bundle Wrapping & Palletizing
Core Manufacturing Controls

Continuous Double-Belt Press Technology:
Panels are bonded under a 30-meter automated double-belt press. Controlled heating and continuous pressure application eliminate air pockets, ensuring full-surface chemical bonding between facings and core insulation without surface telegraphing.

Automated Adhesive Distribution:
Two-component polyurethane adhesive is applied via multi-head oscillating spray nozzles at precise coat weights, maintaining skin-to-core shear strength above specification across 100% of the panel area.

Factory Quality Verification Testing:
Every production lot undergoes structural and thermal validation:
Tensile Bond Strength Test: Destructive sample testing to confirm skin-to-core bond failure occurs within the core material, not along the glue line.

Density & Dimensional Calibration: Digital density logging for PIR foam and laser alignment scans across panel width to verify joint tongue-and-groove tolerances.

Thermal Aging Testing: Accelerated environmental testing verifying zero core shrinkage or facing delamination under temperature differentials from -30 degrees C to +70 degrees C.

Packaging & Delivery

Surface Protection: Custom 50 um PE protective film applied to decorative facings, designed for clean removal up to 3 months after installation.

Bundle Packing: Panels are stacked facing-to-facing with EPS cushion foam blocks inserted between adjacent sheets to prevent rib abrasion.

Exterior Wrapping: Full bundle shrink-wrapped in heavy-duty waterproof PE plastic film, with top and bottom corrugated corner protectors.

Container Loading & Dunnage:
Transport Mode: Shipped in 40ft HQ containers with floor-level timber skids and side air bags to prevent movement during sea transit.

Loading Rate (100 mm Thick Wall Panels): Approx. 450 m2 to 500 m2 per 40ft HQ container (subject to panel length configuration).

FAQ

Q: What is the primary operational difference between PIR and Rockwool Sandwich Panels?

A: PIR panels offer superior thermal insulation performance with a very low thermal conductivity (0.022 W/m.K), making them ideal for cold storage where energy saving and thin panel profiles are paramount. Rockwool panels utilize inorganic mineral fiber that provides non-combustible Class A1 fire protection and sound absorption, making them mandatory for fire-rated building compartments, high-occupancy industrial plants, and hazardous storage zones.

Q: How do you prevent panel delamination during thermal expansion and contraction cycles?

A: Delamination is prevented through precise skin treatment and adhesive chemistry. Steel facings undergo corona surface treatment prior to lamination to increase surface tension. Combined with continuous double-belt hot-pressing and two-component PUR adhesive bonding, the bond strength exceeds the internal cohesive strength of the core material itself under temperature swings from -30 degrees C to +70 degrees C.

Q: How is water penetration prevented at panel joints in exterior wall and roof applications?

A: Our panels feature deep-interlocking tongue-and-groove joints engineered with capillary break grooves. Factory-applied butyl rubber sealants or EPDM gaskets are integrated along the joint recess. For roof applications, 3-rib or 5-rib overlapping profiles with hidden fastener clips ensure continuous water shedding without exposed screw penetrations.

Q: Are these sandwich panels certified for hygienic cleanroom and food processing applications?

A: Yes. Cleanroom grade panels use flat or micro-ribbed food-safe PPGI or Stainless Steel 304 facings coated with anti-bacterial PVC films or USDA-compliant PE coatings. Joint interfaces are sealed flush using silicone-compatible profiles, providing smooth, non-porous surfaces that withstand aggressive chemical washdowns and daily sanitization.

Q: What is the maximum unsupported span length for wall and roof panels under wind load?

A: Span capability depends on panel thickness, facing gauge, core material, and local wind pressure requirements. For example, a 100 mm PIR wall panel with 0.5 mm steel facings under a 1.0 kPa wind load can typically achieve clear spans of up to 4.0 to 5.0 meters between structural girts. Detailed span-load calculation tables are provided for every project configuration.

Q: What is the Minimum Order Quantity (MOQ) and production lead time for custom container orders?

A: Standard Production MOQ: 500 m2 per panel thickness and color specification.
Custom Color / Non-Standard Thickness MOQ: 1,000 m2 per specification.
Production Lead Time: 12 to 18 calendar days from shop drawing confirmation and deposit receipt to container loading.

We're well-known as one of the leading sandwich panel manufacturers and suppliers in China, also support custom service. Please feel free to wholesale high quality sandwich panel made in China here from our factory. For more information, contact us now.

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