Sandwich panels outperform steel and wood across the metrics that matter most to manufacturers: weight, durability, corrosion resistance, and total cost of ownership. A thermoplastic sandwich panel built with a PP honeycomb or PET foam core and glass-fibre-reinforced skins delivers structural performance comparable to steel at a fraction of the mass, and outlasts wood by a wide margin in demanding transport and industrial environments. The questions below unpack each of those advantages in detail.
How much weight do sandwich panels save compared to steel and wood?
A thermoplastic sandwich panel is significantly lighter than an equivalent steel panel and meaningfully lighter than plywood of comparable thickness. In commercial vehicle and industrial panel applications, switching from steel or wood to a composite sandwich panel can reduce structural weight by a substantial margin, depending on the specific configuration and application requirements. That weight saving translates directly into payload capacity or, in the case of electric vehicles, extended battery range.
For truck body builders and trailer manufacturers, every kilogram removed from the body structure is a kilogram that can carry revenue-generating cargo. In 2026, this argument has a second dimension that procurement teams increasingly raise: lighter body structures extend battery range in electric trucks and vans. Every kilogram of structural dead weight reduces range per charge, making weight reduction a range argument, not just a payload argument. EV fleet buyers now treat this as a standard procurement question.
The weight advantage of sandwich panels comes from their construction logic. A lightweight core, whether oriented PP foam or PP honeycomb, separates two thin, high-stiffness glass-fibre skins. This geometry delivers high bending stiffness relative to mass, the same principle that makes an I-beam stiffer than a solid bar of the same weight. The result is a panel that carries significant loads without the mass penalty of solid steel or thick plywood.
Are sandwich panels as strong as steel or wood?
For the load cases relevant to truck bodies, trailer floors, and scaffolding boards, thermoplastic sandwich panels match or exceed the structural performance of steel and wood at a lower weight. The key is matching the panel configuration to the specific load demand: core density, skin architecture, and panel thickness all influence bending strength and compressive performance.
Sandwich panel strength is not a single figure. It depends on the combination of core material, core density, skin layup, and thickness. A 30 mm panel with a PP honeycomb core and 4-ply glass-fibre skins carries substantially higher loads than a 15 mm wall panel with a lower-density foam core. Both are sandwich panels, but they serve different structural roles.
For scaffolding, the structural case is particularly concrete. A 10.5 mm Compoform panel achieves EN 12811 load class 4 with no support underneath, which is the relevant European standard for scaffold boards under working load. That is a measurable structural benchmark, not a general claim. For truck body floors, a self-supporting 30 mm PP sandwich floor panel eliminates the need for an aluminium subframe, removing a production step and reducing assembly cost for body builders.
Wood, by contrast, is variable in strength because it is a natural material. Grain direction, moisture content, and knot density all affect performance. Steel is consistent but heavy, and its strength-to-weight ratio is lower than that of a well-specified composite sandwich panel. For applications where the dominant load is bending across a span, such as a trailer floor or a scaffold plank, sandwich panels are a structurally sound alternative to both.
What are the durability advantages of sandwich panels over wood?
Thermoplastic sandwich panels last significantly longer than wood in transport and industrial environments. In heavy transport applications, composite panels typically achieve service lives of 12 years or more, compared to 3 to 5 years for plywood under comparable conditions. Over a 15-year vehicle life, that difference eliminates two to three plywood replacement cycles.
Wood degrades through a combination of moisture absorption, delamination, rot, and mechanical wear. In a truck body or trailer floor that is regularly washed down, loaded with heavy goods, and exposed to variable temperatures, plywood deteriorates relatively quickly. Each replacement cycle involves panel cost, installation labour, and vehicle downtime, all of which add to the total cost of ownership in ways that are easy to underestimate when comparing unit prices.
Thermoplastic sandwich panels do not absorb moisture. The glass-fibre-reinforced skins are impermeable, and edge sealing and edge bending protect the core from water ingress at the panel perimeter, which is the most vulnerable point in any sandwich construction. This is particularly relevant for scaffolding boards and truck floors that face regular washdown or outdoor exposure.
The surface finish also contributes to durability. Wall panels with white PET-film surfaces achieve over 22,000 hours of UV resistance, tested to ISO 4892. Floor panels with black anti-skid surfaces are engineered for abrasion resistance under foot and pallet traffic. Neither finish requires painting, sealing, or periodic retreatment, which wood typically does to maintain its structural and aesthetic properties.
How do sandwich panels compare to steel for corrosion resistance?
Thermoplastic sandwich panels do not corrode. Steel corrodes when its protective coating is breached, which is an ongoing maintenance liability in transport and outdoor industrial applications. A composite sandwich panel with glass-fibre-reinforced thermoplastic skins is chemically inert to moisture, road salt, cleaning agents, and the range of substances a commercial vehicle body encounters in service.
For truck body builders and trailer manufacturers, corrosion is a real operational cost. Steel panels require protective coatings that degrade over time, particularly at cut edges, fastener holes, and weld points. Once corrosion takes hold, it spreads, and remediation is labour-intensive. In contrast, a thermoplastic sandwich panel can be cut, drilled, and fastened without creating corrosion initiation points, because the material itself is not susceptible to oxidation.
In scaffolding applications, the corrosion argument is equally relevant. Steel scaffold boards and frames exposed to outdoor conditions require regular inspection and treatment to remain safe. Composite scaffold boards eliminate that maintenance burden and maintain consistent mechanical properties throughout their service life, without the degradation that rust introduces into steel’s load-bearing capacity.
Are sandwich panels more sustainable than steel and wood?
Thermoplastic sandwich panels offer meaningful sustainability advantages over both steel and wood, primarily through lower lifecycle weight, longer service life, and recyclability at end of use. For European manufacturers subject to CSRD sustainability reporting requirements, the material choice in structural panels is increasingly a compliance consideration, not just a preference.
The weight advantage of sandwich panels has a direct carbon implication in transport. A lighter vehicle body reduces fuel consumption or extends electric range across every kilometre the vehicle operates. Over a vehicle’s working life, the cumulative energy saving from reduced structural mass is substantial, even before accounting for the manufacturing energy comparison between composite and steel production.
Thermoplastic composites are recyclable. Unlike thermoset composites, which cannot be remelted, thermoplastic panels can be reprocessed at end of life. This is directly relevant to the EU End-of-Life Vehicles (ELV) Directive, which sets recyclability targets for vehicles and their components. Manufacturers specifying thermoplastic sandwich panels for vehicle bodies are choosing a material that supports compliance with those targets.
Wood appears sustainable on the surface, but in heavy transport applications its short service life creates a different kind of environmental cost. Replacing a truck floor two to three times over a vehicle’s life consumes additional material, generates waste, and produces landfill exposure from treated timber that carries its own disposal implications. A composite panel that lasts the life of the vehicle avoids those replacement cycles entirely.
When should manufacturers choose sandwich panels over traditional materials?
Manufacturers should choose sandwich panels over steel or wood when weight reduction, durability, corrosion resistance, or lifecycle cost are primary decision criteria. In practice, this covers most commercial vehicle body applications, scaffolding boards, and industrial floor and wall panels where the operating environment is demanding and replacement costs are significant.
The strongest case for sandwich panels arises when two or more of the following conditions apply:
- Payload or range is commercially sensitive — every kilogram saved in structure adds revenue capacity or extends EV range per charge
- The panel faces moisture, chemicals, or outdoor exposure — conditions that degrade wood and corrode steel but leave thermoplastic composites unaffected
- Replacement cycles are costly — when panel cost, installation labour, and vehicle downtime make frequent replacement economically painful
- Custom dimensions are required — standard steel or timber sheet sizes rarely match the exact geometry of a truck body or trailer floor without significant waste or jointing
- Sustainability reporting applies — CSRD obligations or customer sustainability requirements make material recyclability and lifecycle carbon relevant to procurement decisions
Steel remains the right choice where extreme point loads, weld-in fittings, or very high compressive forces are the dominant design requirement, and where weight is not a constraint. Wood may still be appropriate for low-cost, short-life applications where replacement is straightforward and the operating environment is dry and controlled. Outside those specific conditions, sandwich panels deliver a better combination of performance, longevity, and total cost.
How We Help You Choose and Specify the Right Sandwich Panel
We work with truck body builders, trailer manufacturers, and scaffolding companies across Europe to specify sandwich panel configurations that match the exact demands of their application. That means reviewing your load requirements, assembly process, and operating environment before recommending a panel, not after.
Here is what that looks like in practice:
- Application review: We assess your structural load case, the relevant European standard (EN 12811 for scaffolding, trailer floor load specs for transport), and the environmental conditions the panel will face in service
- Panel configuration: We select the appropriate core material (PP honeycomb or PET foam), core density, skin architecture, and thickness to meet your performance requirements without over-engineering the panel
- Custom dimensions: Panels are available in custom dimensions up to 13,500 mm x 2,950 mm, cut to your exact specification, so you receive panels that fit your assembly process without modification or waste
- Integration support: We flag potential issues before production, whether that is edge sealing requirements, fastener compatibility, or surface finish selection for your specific application
- Lifecycle cost modelling: We help you build the TCO case internally, including the replacement cycle comparison that makes the composite investment straightforward to justify against a lower unit price for plywood or steel
If you are specifying panels for a truck body floor, trailer sidewall, or scaffolding board and want to understand which configuration fits your load class and assembly process, contact our engineering team for panel advice directly. We review your design, not just your order.