How to evaluate a sandwich panel datasheet?

compoform · 04 Aug 2026

A sandwich panel datasheet should always include the panel’s construction (core type, skin architecture, and thickness), mechanical properties tested to recognised standards, surface finish specifications, and dimensional tolerances. Those four categories give you enough information to assess whether a panel will perform in your application and whether the supplier’s claims are verifiable. The sections below work through each evaluation question in turn, from reading flexural values to spotting weak datasheets before they cause production problems.

What key properties should a sandwich panel datasheet always include?

A complete sandwich panel datasheet must include panel construction details, mechanical performance data, surface finish specifications, dimensional tolerances, and the test standards used to generate each figure. Without all five, you cannot make a reliable comparison between suppliers or confirm fitness for your application.

In practice, look for these categories on any datasheet you evaluate:

Panel construction: Core material and density, skin architecture (number of plies, fibre orientation), total thickness, and areal weight in g/m²
Mechanical properties: Bending strength, flexural modulus, tensile strength, tensile modulus, and compressive strength of both the panel and the core separately
Surface finish: Finish type (PET film, anti-skid, painted), gloss level, whiteness or colour index where relevant, and UV resistance rating
Dimensional tolerances: Thickness tolerance, maximum panel dimensions, and any manufacturing features such as weld lines
Referenced test standards: The specific standard used for each mechanical value, not just a general claim of compliance

For commercial vehicle and scaffolding and truck body applications, areal weight is particularly important because it directly affects payload capacity and, in electric trucks and vans, battery range per charge. A datasheet that lists bending strength but omits areal weight is incomplete for any weight-sensitive procurement decision.

How do you interpret flexural strength and stiffness values on a datasheet?

Flexural strength tells you the maximum bending stress a panel can sustain before it fails. Flexural modulus (stiffness) tells you how much the panel deflects under a given load before reaching that failure point. Both values matter, but they answer different questions: strength governs failure, stiffness governs serviceability.

When reading these figures, pay attention to whether the datasheet states minimum values or average values from a test batch. A well-documented datasheet will show both, along with the range across samples. This distinction matters because a supplier may report an average that looks strong while the lowest individual sample sits well below what your application requires.

Also check the test geometry. Flexural values measured on a short span will appear higher than those measured on a longer span for the same panel. The span-to-thickness ratio used in the test should be stated alongside the result. If it is not, the figure is difficult to apply to your design without further clarification from the supplier.

For scaffolding and truck floor applications, stiffness is often the governing criterion rather than outright strength. A panel that deflects excessively under load creates safety and usability problems even if it never reaches its failure stress. Confirm that the flexural modulus figure aligns with your maximum allowable deflection under the expected load.

What’s the difference between face sheet and core material specifications?

Face sheet specifications describe the mechanical properties of the outer skins in isolation, typically tensile strength and tensile modulus measured on the skin alone. Core material specifications describe the properties of the internal structure, typically compressive strength, compressive modulus, and shear properties. A sandwich panel datasheet should report both separately, because each component governs a different failure mode.

The face sheets carry the bending loads. In a sandwich panel under flexural loading, the outer skins act like the flanges of an I-beam, one in tension and one in compression. Their tensile strength and modulus determine how much bending load the panel can resist and how stiff it will be.

The core transfers shear between the two skins and resists through-thickness compression. A core that is too weak in shear will allow the skins to slide relative to each other, causing delamination or shear failure before the skins themselves reach their limits. Compressive strength matters for applications where point loads or concentrated forces act perpendicular to the panel face, such as forklift loads on a truck floor or foot traffic on a scaffolding board.

When comparing datasheets, check whether skin properties are reported per skin or for the full panel laminate. Suppliers sometimes blend these figures in ways that obscure the actual skin performance. A transparent datasheet will clearly separate skin test results from whole-panel test results and state the skin thickness and areal weight independently.

Which test standards should be referenced on a sandwich panel datasheet?

For European applications, a sandwich panel datasheet should reference ISO 14125 for flexural properties, EN ISO 527 for tensile properties of the face skins, EN ISO 844 for compressive strength of the core, and EN 12667 for thermal conductivity where relevant. For scaffolding panels, EN 12811 defines the load classes that determine whether a panel is fit for use as a working platform.

Datasheets that reference only ASTM standards without European equivalents are not automatically invalid, but they require additional scrutiny for European procurement. ASTM D3039 for tensile testing and ASTM D5630 for fibre content are widely used in composite manufacturing globally, but European OEM procurement engineers and certification bodies will typically require EN ISO equivalents for formal qualification.

For surface durability, UV weathering resistance tested to ISO 4892 is the relevant standard for panels used in outdoor applications such as truck bodies, trailers, and scaffolding. Fire performance should reference EN 13501-1 for European markets. If a datasheet cites a fire rating without specifying the test standard and classification system, the rating cannot be used for regulatory compliance.

The presence of a standard reference alone is not sufficient. The datasheet should also state the test date, sample dimensions, number of samples tested, and whether the reported value is a minimum, average, or characteristic value. These details allow you to assess the reliability of the data and compare it meaningfully against other suppliers.

What are the red flags on a sandwich panel datasheet?

The most important red flags on a sandwich panel datasheet are missing test standards, values reported without stating whether they are minima or averages, no indication of sample size, and mechanical properties that cover only the full panel without separating skin and core data. Any of these gaps makes independent verification impossible.

Watch for these specific warning signs:

No test standard cited: A bending strength figure with no reference to ISO 14125 or an equivalent standard cannot be compared to any other supplier’s data
Average values only, no range: If a supplier reports only the average across test samples and omits the minimum, you have no way to assess consistency or set a conservative design value
Panel-level data only: Datasheets that report whole-panel bending results but omit skin tensile data and core compressive data are incomplete for structural design
No areal weight: For any weight-sensitive application, a datasheet without areal weight in g/m² is missing a procurement-critical figure
Vague dimensional tolerances: “Standard dimensions available” without stating actual tolerances is a signal that the supplier may not hold tight dimensional control in production
Undated test results: Test data without a date cannot be verified as current or representative of the material you will actually receive

A datasheet that passes all of these checks is not automatically a good product, but one that fails several of them is a strong signal to request additional documentation before proceeding.

How do you compare datasheets from different sandwich panel suppliers?

To compare sandwich panel datasheets from different suppliers, normalise the data to the same basis before drawing any conclusions. This means checking that the same test standard was used, that values are reported on the same basis (minimum vs. average), and that panel constructions are genuinely comparable in thickness, skin architecture, and core density.

A structured comparison should work through these steps:

Align the test standards: Only compare flexural values tested to the same standard and span geometry. A result from ISO 14125 at a 250 mm span is not directly comparable to one at a 400 mm span
Check the construction basis: Two panels at the same nominal thickness can have very different performance if one uses a 4-ply skin and the other uses a 2-ply skin. Skin architecture drives mechanical performance more than thickness alone
Compare areal weight alongside strength: A heavier panel that is stronger may still be the wrong choice if your application is weight-constrained. Calculate the strength-to-weight ratio, not just the absolute strength figure
Assess core density: For foam-core panels, core density directly affects compressive strength and shear performance. A panel with a 60 kg/m³ foam core will behave very differently from one with a 140 kg/m³ honeycomb core, even at the same thickness
Verify dimensional capability: Check maximum panel dimensions against your production requirements. If your truck body or trailer design requires panels longer than a supplier can produce, the mechanical data is irrelevant

Where datasheets are incomplete or use different reporting conventions, contact the supplier directly and ask for the underlying test reports. A supplier who cannot or will not provide test reports behind their datasheet values is a procurement risk, regardless of how strong the headline figures appear.

How We Support Your Datasheet Evaluation

Reading a datasheet in isolation only gets you so far. The real value comes from matching the panel configuration to your specific application, load case, and assembly process. Here is how we approach that with our customers:

Application-specific panel selection: We review your load requirements, dimensional constraints, and surface finish needs, then recommend the panel configuration from our range that fits, whether that is a PP-honeycomb floor panel for a truck body or a PP-foam wall panel for a cargo box interior
Transparent test data: Our datasheets include test dates, sample counts, minimum and average values, and full construction details. For floor panels, for example, our test reports show individual sample results across ten specimens so you can assess consistency, not just the headline average
European standards throughout: All mechanical data references ISO 14125 for flexural performance and EN ISO standards for tensile and compressive properties. Our scaffolding panels are tested to EN 12811 load classes, giving you a direct regulatory reference point
Custom dimensions to your specification: Panels are available in custom dimensions cut to your exact specification, up to 13,500 mm × 2,900 mm, removing the need to design around standard sheet sizes
Compoform-specific performance data: A 30 mm PP sandwich panel floor from our range is self-supporting with no aluminium subframe required, which removes a production step and reduces cost for truck body builders. That is a concrete, verified claim, not a general composite market claim

For truck body builders and trailer manufacturers evaluating composite floors, the weight argument extends beyond payload. In electric trucks and vans, every kilogram of structural dead weight reduces battery range per charge. Lighter body structures are a range argument as much as a payload argument, and EV fleet buyers are asking this question directly in 2026 procurement conversations.

If you are working through a panel specification and want a second set of eyes on the datasheet comparison, speak with our engineering team. We review your design, flag potential issues before production, and help you arrive at a panel configuration that performs in service, not just on paper.