PIR Sandwich Panel: On‑Site Common Faults FAQ
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Q1: What causes shrinkage and warping of PIR sandwich panel after installation?
A: PIR foam has excellent thermal stability compared with ordinary PU foam, but PIR sandwich panel will still suffer slight shrinkage if the foaming formula is not mature. Low‑grade PIR sandwich panel adopts insufficient cross‑linking formula. Under long‑term temperature cycling between cold and hot, the PIR foam core will shrink slowly, leading to widened panel joints and uneven wall surface. For large cold‑storage projects, select high cross‑linking PIR sandwich panel and reserve reasonable expansion joints during installation.
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Q2: Why does delamination happen between PIR foam core and metal skins?
A: Delamination of PIR sandwich panel mainly comes from three factors. First, the surface treatment of metal sheet is poor, and the adhesive cannot form stable bonding with PIR foam. Second, manufacturers reduce pressing time and pressure in the continuous composite line to boost output. Third, water vapor invades the cut cross‑sections after field cutting and destroys the bonding interface. All cut faces of PIR sandwich panel must be fully sealed right after cutting. You can test the bonding strength with free samples before bulk order of PIR sandwich panel.
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Q3: Will PIR sandwich panel insulation performance decay under long‑term ultra‑low temperature in cold storage?
A: High‑quality PIR sandwich panel maintains stable thermal conductivity under continuous low‑temperature environment, which is one of its biggest advantages for cold storage. However, inferior PIR sandwich panel with incomplete curing will produce micro‑cracks inside the foam core after long‑term freezing, resulting in gradual loss of thermal insulation effect. For deep‑freeze cold storage projects, confirm the low‑temperature aging test report of finished PIR sandwich panel before purchase.
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Q4: Why does PIR sandwich panel fail fire acceptance even though PIR is known for good fire performance?
A: PIR foam has better fire resistance than PU foam, but the overall fire performance of finished PIR sandwich panel depends on adhesive, edge sealing material and metal skins. Some suppliers only provide test reports of bare PIR foam core instead of finished PIR sandwich panel test documents. During tender and acceptance, you must obtain third‑party test reports corresponding to finished PIR sandwich panel and verify parameter consistency with delivered goods.
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Q5: Does PIR sandwich panel need moisture protection during storage and construction?
A: PIR foam is closed‑cell material with low water absorption. But cutting breaks the closed‑cell structure of PIR sandwich panel. Unsealed cut sections will absorb water vapor, which reduces bonding strength and thermal insulation performance. PIR sandwich panel should be stored indoors under dry conditions. Avoid open‑air stacking in rainy weather.
🏭 As a local source manufacturer in Foshan, SAMZOON masters the formulation and composite process of PIR sandwich panel. We are familiar with cold storage and industrial project acceptance standards. Custom PIR sandwich panel, urgent production scheduling and free sample service are available. Our technical team provides project selection suggestions and on‑site construction guidance to help engineering customers avoid typical PIR sandwich panel faults and achieve smooth project acceptance. A large number of South‑China cold‑storage and industrial project landing cases can be referenced.
When sourcing PIR sandwich panel, do not compare unit price only. Check foam cross‑linking degree, fire performance, adhesive compatibility and finished‑product test documents comprehensively. Proper material selection and standardized on‑site operation are critical to prevent shrinkage, delamination and acceptance failure of PIR sandwich panel.
