How do sandwich panels handle forklift and pallet truck loads?

compoform · 09 Aug 2026

Thermoplastic sandwich panels handle forklift and pallet truck loads well when the panel configuration is matched to the load type and frequency. The right core material, skin thickness, and panel depth determine whether a floor holds up under repeated wheeled traffic or develops localised damage over time. The questions below unpack the specific performance factors that matter most for logistics and transport floor applications.

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 load ratings do sandwich panels typically carry?

Sandwich panel floors for commercial vehicle and logistics applications are typically rated by the maximum distributed load they can sustain without permanent deformation, and by point load capacity under concentrated wheel contact. Load ratings vary significantly depending on core material, core density, skin architecture, and panel thickness. There is no single universal figure that applies across all sandwich panel configurations.

For truck body and trailer floors, the relevant benchmark is the floor’s ability to support loaded pallets, forklift wheels, and cargo restraint forces simultaneously. A well-specified composite floor panel can match or exceed the load-bearing performance of plywood at a fraction of the weight, but only when the specification is built around the actual load case rather than a generic product selection.

In scaffolding applications, European standard EN 12811 defines load classes from 1 to 6. An 11 mm composite scaffolding panel achieving load class 4 without any support structure underneath is a meaningful performance benchmark. For truck floors, the governing load is typically expressed as a uniformly distributed load in kN/m², combined with a point load representing a forklift wheel pressing on a small contact area.

How do sandwich panels respond to forklift wheel pressure?

Sandwich panels respond to forklift wheel pressure through a combination of localised skin compression and core shear. The stiff outer skins distribute the concentrated wheel load across a wider area of the core, reducing peak stress at the contact point. How well this works depends on skin stiffness, skin thickness, and the compressive strength of the core directly beneath the wheel.

The critical failure mode under forklift wheel loads is not bending across the full panel span but localised indentation at the contact patch. A forklift wheel applies a high force over a small area, and if the skin cannot spread that load fast enough, the core beneath the contact point can crush. This is why floor panels intended for forklift traffic use denser cores and thicker, multi-ply skins compared to wall panels carrying only distributed pressure.

Anti-skid surface finishes on composite floor panels also play a role here. Beyond grip, the surface layer adds a degree of abrasion resistance that protects the structural skin from repeated wheel scuffing, which matters in loading dock environments where forklifts make frequent turns on the same floor area.

What’s the difference between static and dynamic forklift loads on panels?

Static loads are the sustained weight of a forklift and its cargo sitting in one position. Dynamic loads are the impact and vibration forces generated when a forklift moves, accelerates, brakes, or drops a load. Dynamic loads are consistently higher than static loads and cause more damage over time because they introduce repeated stress cycles that can fatigue the core-to-skin bond.

When a loaded forklift drives over a panel joint or a surface irregularity, the impact force can be several times the static wheel load. This is why specifying a panel based only on its rated static load capacity is not sufficient for active forklift environments. The panel’s resistance to repeated dynamic loading, and specifically the durability of the core-skin interface under cycling, is the more relevant performance criterion for truck floors and loading dock applications.

Thermoplastic composite panels have an advantage here compared to thermoset composites. The thermoplastic matrix absorbs impact energy rather than cracking, which means the panel can sustain repeated dynamic loading without the brittle fracture behaviour that thermoset materials can exhibit. Compoform’s continuous fibre-reinforced thermoplastic construction delivers up to 50% higher impact resistance compared to other composite materials, based on Compoform’s own testing, which directly addresses the dynamic load challenge in forklift environments.

Which sandwich panel core materials best handle forklift traffic?

For forklift traffic, PP honeycomb cores outperform foam cores of equivalent thickness. The honeycomb geometry provides high compressive strength in the through-thickness direction, which is exactly the direction a forklift wheel loads the panel. PP honeycomb at 140 kg/m³ delivers the compressive resistance needed to prevent localised indentation under concentrated wheel loads.

PP foam cores are available in a range of densities from 40 to 140 kg/m³. Lower-density foam cores are well suited to wall panels and lightly loaded floor applications, but for active forklift environments, only the higher-density grades provide adequate point load resistance. The choice between PP honeycomb and high-density PP foam for a specific floor application depends on the actual wheel load, contact area, and traffic frequency, not a generic preference for one core type over the other.

Core materials to avoid in forklift floor applications include any low-density option selected primarily for weight reduction without a corresponding increase in skin thickness to compensate. The skin-core combination must be engineered as a system. A lightweight core paired with thick, stiff skins can still perform well under forklift loads, but this requires deliberate specification rather than a standard off-the-shelf selection.

Do sandwich panel floors need reinforcement at loading dock areas?

Loading dock areas are the highest-stress zones in any truck body or trailer floor because forklifts enter and exit at speed, often with maximum loads, and the rear edge of the floor takes repeated impact from the forklift’s front wheels dropping down from the dock. In many cases, local reinforcement at the rear entry zone is advisable, though the need depends on the base panel specification and the forklift capacity in use.

Reinforcement options include increasing core density in the entry zone, adding additional skin plies at the rear section, or integrating a steel or aluminium threshold plate at the very edge. For thermoplastic composite floors, the advantage is that these reinforcements can be incorporated during panel production rather than added as site modifications, keeping the assembly process clean and the floor surface flush.

A 30 mm PP honeycomb floor panel is self-supporting across the full trailer width with no aluminium subframe required. This removes a production step for truck body builders and reduces overall floor weight. At the loading dock entry zone, the same panel can be locally upspecified in skin thickness without changing the overall floor design, which simplifies production and avoids the cost of a full-floor upgrade.

For EV truck bodies, this matters beyond payload. Every kilogram saved in the floor structure extends battery range per charge. Fleet operators transitioning to electric trucks increasingly treat structural weight as a range argument, not just a payload argument, and this is a standard procurement question from EV fleet buyers in 2026. A well-specified composite floor that eliminates the subframe and reduces entry-zone reinforcement weight contributes directly to range per charge.

How do composite panel floors compare to steel and plywood under forklift use?

Composite sandwich panel floors outperform both steel and plywood in key areas relevant to forklift environments: weight, corrosion resistance, and service life. Steel floors are heavy and corrode in wash-down environments. Plywood floors absorb moisture, delaminate under repeated forklift traffic, and typically need replacing every three to five years in active logistics use.

A thermoplastic composite floor lasts significantly longer than plywood in heavy transport applications. Over a 15-year vehicle life, a composite floor eliminates two to three plywood replacement cycles. Once you account for panel cost, installation labour, and vehicle downtime during replacement, the composite floor is cheaper per year of service even at a higher unit price. The TCO argument is concrete, not theoretical.

Against steel, the weight advantage is the primary differentiator. A composite floor of equivalent load-bearing capacity is substantially lighter, which converts directly into payload capacity on conventional trucks and into range per charge on electric trucks. Steel also corrodes at panel edges and fastener points in wash-down environments, whereas thermoplastic composite panels with proper edge sealing resist moisture ingress and maintain structural integrity over the vehicle’s full service life.

Plywood does have one practical advantage: it is familiar to fabricators and easy to cut and fasten with standard tools. Composite panels require different fastening approaches and cutting methods, but these are well-established in truck body building and the transition is straightforward with the right technical support during the first production run.

How Compoform Helps with Forklift Load Performance

We work with truck body builders and trailer manufacturers to specify floor panels that match their actual forklift load cases, not a generic floor specification. The starting point is always the real load: forklift capacity, wheel contact area, traffic frequency, and whether the floor sees dynamic entry loads at a loading dock or primarily static pallet storage.

Core and skin selection: We specify PP honeycomb or PET foam cores at the density and thickness required for your load case, combined with the right skin architecture to distribute wheel loads without localised indentation.
Local reinforcement integration: Where loading dock entry zones need upspecification, we incorporate this during panel production, keeping your assembly process simple and the floor surface flush.
Self-supporting floor designs: Our 30 mm PP honeycomb floor panels are self-supporting across standard trailer widths, eliminating the aluminium subframe and reducing both weight and production steps.
Anti-skid surface options: Floor panels are available with a black anti-skid surface finish that provides grip and abrasion resistance for repeated forklift wheel contact.
Custom dimensions: Panels are produced to your exact floor dimensions, up to 13,500 mm x 2,950 mm, so you receive a finished panel ready for installation without site cutting.

Before production, we review your floor design, flag any load concentration points that need attention, and confirm the panel configuration against your assembly process. If you are building truck bodies or trailers and want to move from plywood or steel to a composite floor that handles forklift traffic reliably, speak with our engineering team about your specific load requirements.