XINMAO / TECHNICAL PROCUREMENT GUIDE
Buying stainless steel honeycomb panels: what the technical submission must prove
Review the construction, the test specimen and the installation detail before accepting a panel specification.
A finish sample can settle the colour of a wall. It cannot settle whether the panel behind that finish will remain bonded, carry its fittings or meet the project’s fire requirements. Before a purchase order is released, the technical submission needs to describe the panel that will actually arrive on site.
For architectural stainless steel honeycomb panels, that means reading the material schedule, test reports and installation details together. A strong result on a different construction leaves a gap. This guide explains how to identify that gap and turn it into a specific request for evidence.
Start with the quoted construction
Imagine a hotel refurbishment quotation that offers “15 mm stainless steel honeycomb panels, fire rated.” The price looks competitive, but the description leaves important decisions open. Is only the visible face stainless steel? What is the rear skin? Is the core aluminium or stainless steel? Which adhesive holds the layers together?
Give the assembly a construction code and record both skins, alloy grades, nominal thicknesses, finishes, core material, cell size, foil thickness and density. Identify the adhesive or metal joining route, the finished panel thickness and edge construction. Drawings should show inserts and brackets where they transfer load into the panel.
An aluminium honeycomb core between stainless steel skins is a different product from a stainless steel core between stainless steel skins. A decorative hexagonal surface pattern identifies neither. Keep those distinctions in the quotation and on the sample label.
The submission should then identify which construction code each report covers. Where the delivered panel differs, ask the responsible specialist to explain whether the evidence remains applicable. Do this before the difference becomes a substitution on site.
Read weight as an assembly value
Ask for the finished panel’s mass per square metre and the mass of its largest scheduled module. Separate the skins, core and adhesive from edge profiles, inserts and attached fittings so the installation team knows what must be lifted and supported.
A worked estimate shows why this matters. Assume two stainless steel skins, each 0.5 mm thick, and a steel density of 8,000 kg/m³. Their combined mass is 8.0 kg/m². An assumed 14 mm core at 56 kg/m³ contributes about 0.78 kg/m². With an assumed total adhesive application of 0.80 kg/m², the estimate becomes approximately 9.58 kg/m² before edge pieces or fittings. These are calculation assumptions, not a Xinmao product specification; actual thickness includes the bond lines.
A 1.2 × 2.4 m module at that estimated mass weighs about 27.6 kg before its hardware. Its handling plan needs to address that module, including access through the building and the removal route if it becomes a maintenance panel. Confirm the estimate against the supplier’s declared construction and a representative finished sample.
Choose evidence that answers the failure question
A material strength figure describes only part of a sandwich panel. The submitted tests need to address the connections between its layers and the behaviour of the proposed construction.
For a bonded panel, flatwise tensile testing, such as ASTM C297/C297M, examines resistance perpendicular to the face. Request the result together with the failure location. Failure within the core, within the adhesive or at a skin interface calls for a different interpretation. A failure in the laboratory loading-block connection does not establish the panel’s bond strength.
Peel testing addresses a different loading action. ASTM D1781 can help evaluate process consistency where the facing is sufficiently flexible for the method. Confirm suitability for the actual skin thickness. Comparisons need matching specimen design and conditions; a higher peel value from another construction is not an automatic upgrade.
Beam testing under ASTM C393/C393M provides core or interface shear information and load–deflection data. The report should identify specimen dimensions, support span, loading arrangement and the observed failure. A short coupon’s maximum load cannot simply be assigned to a full-size wall panel. Where stiffness is derived from the test, the calculation method also belongs in the submission.
| Evidence requested | What the reviewer should check |
|---|---|
| Flatwise tensile report | Construction identity, conditioning, strength and failure location |
| Suitable peel test | Facing flexibility, specimen configuration and process consistency |
| Beam or panel loading report | Span, supports, load arrangement, deflection and failure mode |
| Fixing or insert report | Actual connection geometry, load direction and failure location |
| Environmental exposure report | Exposure conditions and the property measured before and after |
Agree acceptance criteria with the responsible engineer before testing. There is no single strength threshold here that qualifies every panel size, support arrangement and architectural application.
Ask what happens after environmental exposure
An initial bond test records the starting condition. For a panel exposed to heat, moisture or repeated temperature changes, request evidence that addresses those conditions and measures a relevant property afterwards.
Laboratory ageing under ASTM C481 is one available route. A useful submission states the exposure sequence, sample construction and changes in the selected properties. An ageing duration should not be translated directly into years of service. For sustained bending loads, consider whether a flexural creep assessment, such as ASTM C480/C480M, is needed in addition to the short-term test.
Select the assessment around the installation. A protected hotel lobby, a humid service area and an exterior entrance have different exposures. The adhesive’s temperature range is one input; it does not establish the durability of the whole panel, its edges or its inserts.
Ask the manufacturer to describe the controls behind the tested panel: surface preparation, adhesive identification, mixing where applicable, application quantity, assembly time and cure conditions. Batch traceability should connect those records to delivered panels. A production change needs a documented review of the supporting evidence.
Keep the fire claim attached to the right product
“Metal skins” is a construction description. The full assembly still needs the fire evidence required for its intended use, including the adhesive, finishes and any backing or additional layers.
Request the classification report and its supporting test references. Check the named product, construction, thickness range, mounting conditions and field of application. Distinguish reaction-to-fire classification from fire resistance of an assembly; a statement about flame spread does not establish a resistance period.
A ship-interior approval, a railway classification and a building classification address different requirements. Likewise, an aluminium-faced panel certificate cannot be transferred to a stainless steel-faced panel by changing the product name. If the quotation proposes a revised finish or adhesive, obtain confirmation that the classification covers that revision.
Have the project’s fire specialist identify the acceptable route for the location and jurisdiction. Record any missing evidence as a condition to be resolved before release. No fire class or certification for Xinmao honeycomb panels is asserted in this guide.
Follow the load into the building
Panel properties become useful when the fixing detail is known. Review the edge closure, local reinforcement, insert or bracket, supporting frame and connection to the primary structure as a continuous load path.
For exterior cladding, EAD 090058-00-0404 provides an assessment route for a specified metallic honeycomb panel kit and its associated fixings. Its scope excludes external suspended ceilings and kits with non-vertical parts. It should therefore not be presented as proof for an overhead assembly. Ceiling submissions require a ceiling-specific basis; EN 13964 is a relevant reference for suspended ceilings within its scope.
The drawing and connection report need to describe the same detail. Review fastener positions, local reinforcement, edge distances and load directions. Identify who approves the design and any project-specific calculations. Connection evidence remains necessary even where the face and core perform well in laboratory coupons.
For a removable panel, include the retaining arrangement and the removal sequence. Demonstrate the clear opening and reach to the equipment in the coordinated drawings or mock-up. A panel that can be released is useful only if maintenance staff can handle it safely and reach what sits behind it.
Make release a recorded decision
For custom stainless steel wall cladding, start the enquiry with the visible panel layout, exposure, finishes and support concept. Xinmao’s wall panel range is a useful application reference; the proposed honeycomb construction and its evidence must be confirmed separately.
A curved column introduces different geometry and handling interfaces. Link the required construction to the approved component drawings when reviewing stainless steel column covers. Neither a project photograph nor a finish sample replaces the technical submission for the ordered assembly.
Before production release, the review record should identify the accepted construction, supporting reports, installation details and remaining conditions. Name the party responsible for resolving each condition. Keep the approved finish sample and panel identifiers connected to that record.
The final check is practical: can the supplied panel be traced to the construction that was reviewed, and can the installer follow the approved detail? That connection gives procurement, fabrication and site teams a shared basis for acceptance when the panels arrive.