Steel sandwich panels: skins, core and complete-system performance

Sandwich panels combine two thin skins with a lightweight core. Bending resistance and insulation depend on composite action and continuous bonding and joints. Evaluate technical specifications, the price basis, delivery terms and quality evidence together. A lower number is not a comparable offer if it covers a different grade, weight, coating or delivery scope.[1][2]

Iranian wire, mesh and fabricated-product quotations can use commercial roll weights, nominal diameters or local product names. For an international order, define core-metal dimensions, usable area, coating, weld quality and lot traceability in the destination project's specification. Match export packing to moisture exposure and handling, and compare the agreed currency price at a named delivery location including freight and damaged-material allowance. Where the item becomes part of a structural, fire-rated or safety system, require evidence for the complete specified assembly rather than assuming a local product label establishes destination acceptance.

Skins carry tensile and compressive stress while the core carries shear and maintains separation. Delamination, thermal bridges, water ingress, edge corrosion and fire behavior can limit the entire assembly.[2][3][4]

Record grade, thickness and coating of both skins, paint system, core type, density and thickness, effective width, joint, fasteners, fire data and warranty. Compare offers only after aligning units, the weight basis, taxes, packaging, loading, freight and quote validity. An omitted cost can outweigh the apparent saving per kilogram. Keep the supplier’s currency and payment date visible before converting to your purchasing currency.

Ask every supplier to answer the same written specification. This prevents an apparently cheaper offer from silently changing the product or scope. Confirm the following before comparing prices:

Use this table to structure the decision. It does not replace engineering calculations or the contract. The final column identifies the evidence to review before accepting an offer.

Errors often begin when a trade name replaces a technical specification, one photograph stands for an entire shipment, or the delivery scope is missing from the quote. Address these specific risks: Nominal skin thickness without verification; Low-density core; Poor joint sealing; Fire claims without a test report. Turn each risk into a written acceptance criterion, sampling requirement or traceable document.

A standard number alone does not demonstrate conformity. Specify the edition, grade, dimensions, tolerances, test method, heat or batch number and acceptance authority. For an import project, confirm the destination’s requirements and the project’s approved specification; an Iranian market designation is not automatic evidence of an equivalent local grade.

Compare panels using effective width, both skins, core, joints and accessories. These define installed cost and performance beyond the square-meter quote.[4][5]

Before ordering, prepare a single comparison sheet covering the product, quantity, unit, theoretical and actual weight, base price, taxes, freight, delivery window, documents and acceptance criteria. Identify who pays each cost and who records discrepancies at receipt. This makes the negotiation clearer and gives the receiving team an agreed basis for checking the shipment.