What sandwich panels are used in swap body and container construction?

compoform · 06 Sep 2026

Swap body and container builders most commonly use thermoplastic sandwich panels with glass-fibre-reinforced skins bonded to a lightweight core, typically PP foam or PP honeycomb. These panels replace steel and plywood across walls, floors, and roofs because they deliver structural performance at a fraction of the weight. The sections below address the specific questions that procurement engineers and body builders ask most often.

This article covers the broader sandwich panel market. Compoform’s range is limited to PP honeycomb and PET foam cores for commercial vehicles and scaffolding.

What materials are sandwich panels made from in swap bodies?

In swap body and container construction, sandwich panels are built from two glass-fibre-reinforced thermoplastic skins bonded to a lightweight core. The skins carry the structural loads, while the core separates them to create bending stiffness. The most widely used core materials in commercial vehicle applications are oriented PP foam and PP honeycomb, both of which combine low density with good compressive and shear performance.

The skins themselves are typically glass-fibre laminates using a cross-ply or multi-ply architecture. In a cross-ply configuration, fibres alternate at 0° and 90°, which distributes strength evenly in both directions. This matters in swap body walls, where loads arrive from multiple directions depending on how the unit is handled, stacked, or secured. Multi-ply skins with four unidirectional layers are common in floor panels, where higher bending resistance is needed under concentrated point loads from forklifts and pallets.

Surface finishes vary by application. Wall panels often carry a white PET film surface, which provides a clean interior finish and resists UV degradation. Floor panels typically use a black anti-skid surface bonded directly to the outer skin, eliminating the need for a separate floor covering and reducing installation steps.

How do sandwich panels compare to steel and wood in container builds?

Sandwich panels are significantly lighter than steel and considerably more durable than plywood in container and swap body applications. A composite sandwich panel wall section can reduce structural weight by a meaningful margin compared to an equivalent steel panel, and it outperforms plywood on lifespan by a factor of three to four in heavy transport use. The trade-off is a higher unit cost, which composite panels recover through lower total cost of ownership over the vehicle’s working life.

Weight and payload

Every kilogram saved in body structure is a kilogram that can be converted into payload. For a fleet operator running at or near the legal gross vehicle weight limit, this is a direct revenue argument. In 2026, this weight argument extends beyond payload to battery range: lighter body structures extend the range of electric trucks and vans per charge. EV fleet buyers now treat structural weight as a range question, not just a payload question, and it has become a standard item in procurement specifications for new vehicle builds.

Durability and maintenance

Plywood floors in heavy transport typically last three to five years before delamination, moisture ingress, or mechanical damage requires replacement. A thermoplastic composite floor panel, properly specified and edge-sealed, routinely achieves twelve or more years of service in the same environment. Over a fifteen-year vehicle life, that eliminates two or three replacement cycles. Once you account for panel cost, installation labour, and vehicle downtime during each replacement, the composite option is cheaper per year of service even at a higher purchase price.

Steel panels do not rot, but they corrode, add dead weight, and are difficult to repair in the field. Composite panels resist corrosion entirely and can be repaired or replaced section by section without structural consequence to the rest of the body.

What panel dimensions are available for swap body applications?

Thermoplastic sandwich panels for swap bodies and containers are available in large-format dimensions that cover full wall and floor runs without intermediate joints. Maximum panel dimensions reach up to 13,500 mm in length and 2,950 mm in width, which covers the full side wall of a standard European swap body in a single panel. Thickness ranges from around 11 mm for lightweight wall cladding to 30 mm or more for structural floor panels carrying forklift loads.

The ability to produce panels in these dimensions without joints is a practical advantage in container construction. Joints are potential weak points for moisture ingress and add assembly time. A single-piece wall panel eliminates both risks. For floor applications, panel thickness and core density are selected based on the expected load distribution, support spacing, and whether the panel needs to be self-supporting or is laid over a subframe.

Panels are available cut to your exact specification, including non-standard lengths and widths that match your body design directly. This avoids the waste and rework that comes from trimming oversized stock panels on the production floor.

Why do swap body manufacturers switch from metal to composite panels?

Swap body manufacturers switch from metal to composite sandwich panels primarily to reduce structural weight, lower long-term maintenance costs, and meet tightening customer requirements around payload and energy efficiency. The shift is increasingly market-driven: end users and fleet operators specify composite materials in their procurement requirements, which pushes body builders to source composite panels whether or not they have independently evaluated the material switch.

Beyond weight, composite panels simplify production. A 30 mm PP sandwich panel floor panel is self-supporting and requires no aluminium subframe underneath it. Removing the subframe eliminates a production step, reduces part count, and lowers the total cost of the finished body. For a body builder running at volume, that saving compounds across every unit produced.

Corrosion resistance is another driver. Metal panels in refrigerated or wash-down environments require protective coatings and periodic maintenance. Thermoplastic composite panels do not corrode and are unaffected by the cleaning chemicals used in food-grade transport. Edge sealing and edge bending protect the core from moisture and UV exposure, which is relevant for any body that is regularly washed down or operates in wet conditions.

The EU End-of-Life Vehicles Directive also creates a compliance argument for thermoplastic composites. Thermoplastic panels are recyclable at end of life, which supports the recyclability documentation that European OEMs increasingly need to provide under CSRD sustainability reporting requirements. See our commercial vehicle and scaffolding panel applications for more detail on how these materials are used across different build types.

What performance standards should sandwich panels meet for containers?

Sandwich panels used in swap bodies and containers should meet European structural and safety standards relevant to the specific application zone. For floor panels, the relevant benchmark is the load class defined by the body builder’s design specification, which typically references point load resistance under forklift tyres and distributed load capacity across the full floor area. For wall panels, bending strength and stiffness under lateral load are the primary criteria, tested in accordance with ISO 14125.

Tensile properties of the skins are evaluated under EN ISO 527. Thermal conductivity matters for temperature-controlled bodies and is measured under EN 12667. UV weathering resistance is relevant for exterior panels and roof sections, where long-term colour stability and surface integrity affect both appearance and structural performance.

For scaffolding applications, EN 12811 defines load classes directly. A panel achieving load class 4 under EN 12811 with no support underneath demonstrates a level of structural performance that translates well into demanding floor applications in container and swap body builds. Fire classification under EN 13501-1 is relevant where the body builder’s customer specifies fire performance, particularly in urban logistics or hazardous goods transport.

Key standards to confirm with your panel supplier:

Tensile testing: EN ISO 527
Flexural strength: ISO 14125
Thermal conductivity: EN 12667
Fire classification: EN 13501-1
Scaffold load classes (reference benchmark): EN 12811
Recyclability compliance: EU ELV Directive and CSRD reporting

Always request test data specific to the panel configuration you are specifying. Mechanical properties vary with core density, skin ply count, and panel thickness, so a datasheet for one configuration does not represent all variants. Confirm the exact specification against your application requirements before committing to a design.

How Compoform Helps with Swap Body and Container Panel Selection

We manufacture thermoplastic sandwich panels with PP honeycomb and PET foam cores, produced on a 72-metre double belt press line at our facilities in the Netherlands. Panels are made to order in dimensions up to 13,500 mm × 2,950 mm × 150 mm, which means we can supply full-length wall and floor panels sized to your body design without intermediate joints or on-site trimming.

When you bring us a swap body or container project, we do not simply take a purchase order and ship panels to spec. We review your body design, identify the right core density and skin architecture for each application zone, and flag potential issues before production starts. That includes:

Core and skin selection matched to your floor load requirements, wall stiffness targets, and surface finish needs
Panel dimensions cut to your exact specification, reducing waste and assembly time on your production floor
Edge treatment options including edge sealing and edge bending to protect the core in wash-down or outdoor environments
Test data for the specific configuration you are ordering, not generic datasheet values from a different panel variant
EV fleet compatibility review, so the weight savings we deliver are documented in a format your customers’ procurement teams can use in their range calculations

All panels are 100% European-made, which supports your supply chain continuity and simplifies CSRD sustainability documentation. If you are evaluating a switch from steel or plywood, we can work through the TCO calculation with you, including the production steps you eliminate and the replacement cycles you avoid over the vehicle’s working life.

Speak with our application engineers about your swap body or container specification, and we will identify the right panel configuration for your build before you commit to a design.