Specifying custom sandwich panel for refrigeration room china supplier for Wholesale and OEM Orders

What the Design Has to Balance

The build method decides whether a panel holds its U-value after five years of daily wash-downs at -25 °C. Continuous lamination on a double-belt line yields uniform foam density across 12 m lengths; discontinuous pressing introduces density gradients at the edges where thermal bridging starts. First-article tooling determines cam-lock engagement depth — too shallow and the joint leaks vapour, too deep and the facing steel yields during installation.

Process choice shows up later as delamination at the foam-to-metal interface when cyclic thermal stress exceeds the adhesive shear strength. A 0.5 mm facing on a 150 mm PIR panel bows 3–4 mm under its own weight across a 3 m span; upgrading to 0.6 mm adds 1.2 kg/m² but cuts deflection in half. Buyers who specify only "0.5 mm minimum" receive the thinnest coil the mill ships that week.

Specification Range and Customisation Limits

Matching the Product to the Buyer's Need

A distributor stocking standard 100 mm PIR panels for walk-in freezers turns inventory in 14 days; the same SKU sits 60 days if the project spec calls for 150 mm rock wool with stainless facings. Procurement officers should lock the core-and-facing matrix before issuing the RFQ — changing from PUR to PIR after tooling cut adds three weeks and a new first-article charge.

OEM buyers integrating panels into prefabricated cold-room modules need cam-lock orientation fixed at the drawing stage. Left-hand versus right-hand lock profile is not interchangeable on site; a 200-panel order with mixed orientations costs a full re-roll. Specify lock hand per wall elevation in the purchase order annex.

Segment-Specific Requirements

Meat processing plants demand PVC 150 µm film on interior faces — it survives daily high-pressure foam cleaning at 80 °C without blistering. Standard PE 25 µm coating fails the 500-hour salt spray test in that environment within 18 months. Pharmaceutical cold chains require rock wool cores with FM 4880 certification; the insurer will not bind coverage on PIR without a project-specific fire engineering report.

Retail display freezers use 75 mm PIR with 0.5 mm white PPGI; the priority is low thermal mass for rapid pull-down, not structural span. Logistics cold stores spanning 6 m bays need 150–200 mm rock wool or 175 mm PIR at 42 kg/m³ with 0.7 mm facings to meet deflection limits under pallet rack loads. Each segment drives a different cost-per-square-metre curve; the cheapest panel that passes the spec is the one that gets reordered.

Questions Buyers Ask Before Ordering

What is the realistic lead time for a 5,000 m² order with custom colour? Four weeks from coil arrival if the colour matches a stocked RAL; six weeks if a new coating batch is required. The coating line runs minimum 2,000 m² per colour change — order below that and you absorb the full setup cost.

Can panels be cut to length at the factory without voiding the joint seal warranty? Yes, provided the cut edge receives the factory-applied butyl tape and the protective film stays intact until installation. Site cutting removes the tape groove and shifts vapour liability to the installer.

How are panels packed for container loading to avoid edge damage? Standard export pack: panels stacked face-to-face with 3 mm EPS spacers, corner protectors on all four edges, steel strapping every 600 mm. A 40'HQ holds 1,150 m² of 100 mm PIR at 0.5 mm facing; rock wool at same thickness drops to 780 m² due to weight limit.

What documentation ships with each batch for customs and project QA? Mill certificate for facing coil, foam density test report per production shift, dimensional inspection sheet per pack, and a container packing list with panel IDs matching the project layout drawing. Certificate of origin issued per shipment; no blanket annual CO.