Name: High-Quality PIR Insulated Sandwich Panels for Walls and Ceilings
Brand: RaxPanel
Availability: MadeToOrder

PIR Sandwich Panel

The PIR sandwich panel consists of a rigid polyisocyanurate (PIR) foam core between two pre-painted steel or aluminum face sheets. PIR is a thermoset foam, meaning it chars rather than melts when exposed to flame. Compared to standard PUR (polyurethane) foam, PIR offers better fire performance and lower thermal conductivity, which is why it has become the default choice for cold storage and food-processing construction.

The foam core is produced through a continuous one-shot foaming process, where the two metal facings act as the mold. This means the core bonds directly to the steel skins during foaming, without requiring a separate adhesive layer. Panels join side-to-side using tongue-and-groove profiles with optional cam-lock fasteners to create vapor-tight enclosures.

Typical applications include walk-in freezers and coolers, food processing facilities, pharmaceutical cleanrooms, temperature-controlled warehouses, and prefabricated building envelopes where insulation performance directly determines operating cost.

Leading Wholesaler of Custom PIR Sandwich Panels

RaxPanel manufactures PIR sandwich panels on continuous foaming lines at our facility in Hebei, China. We control the full production process, from steel coil pre-cutting through foam dispensing, pressing, and curing, which allows us to maintain consistent foam density and core-to-skin adhesion across every batch.

We stock standard panel thicknesses from 50mm to 250mm in both wall and roof profiles. Surface options include PPGI, Galvalume, stainless steel 304, and aluminum foil. Cam-lock joint panels for modular cold room assembly are available alongside standard tongue-and-groove panels. We also supply matching corner pieces, fixing kits, and silicone sealant.

Each production run is sampled for foam density (target 40-42 kg/m3), compressive strength, and bond strength before release. Panels are wrapped with protective PE film and loaded on export pallets for container shipping. Our typical lead time for standard specifications is 12-15 days.

Our panels are used in cold storage, refrigerated transport, and industrial roofing:

Walk-in coolers and freezers
Food and pharmaceutical processing facilities
Prefabricated warehouse roofing and wall cladding

Parameter Category	Parameter	Value
Core Properties	Core Material	Polyisocyanurate (PIR) Foam
	Core Thickness	50mm – 250mm
	Fire Rating (DIN 4102)	B1
Panel Dimensions	Panel Thickness	50mm – 250mm
	Panel Width	1000mm, 1200mm
	Panel Length	Customizable
Skin Properties	Skin Material	PPGI Steel, Aluminum, SS304
	Skin Thickness	0.4mm – 0.8mm
	Coating Type	PVDF (PVDF), others available
	Color/Finish Options	Wide selection of colors, wood grain, stone grain
Performance	Thermal Conductivity	0.020-0.026 W/m.K
	Density	40-42 kg/m3
	Fabrication	Can be cut, routed, and shaped with standard wood or aluminum tools
	Adhesive	Continuous Foaming Bonding (No Adhesive Layer)
Applications	Primary Uses	Building facade cladding, curtain wall systems, spandrel panels, opaque glazing panels, cold storage, infill panels

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PIR Sandwich Panel Selection & Installation Guide

💡 Pro Tip: Do Not Under-Spec Panel Thickness
The most common specification mistake is choosing panel thickness based on initial cost rather than operating temperature. A 100mm panel in a -25 degrees C freezer will lose roughly 30% more energy per square meter than a 150mm panel. The cost premium of thicker panels is typically recovered within 2-3 years through lower electricity bills.

1. How does PIR compare to PUR and EPS insulation?

PIR, PUR (polyurethane), and EPS (expanded polystyrene) are the three foam cores still widely used. PIR has largely replaced PUR in cold storage and food-grade construction because it chars rather than melts under flame, and its k-value drifts less over time. EPS is cheaper but has significantly worse insulation performance per millimeter and does not meet fire requirements for most commercial projects.

2. What panel thickness do you need for your temperature range?

Panel thickness should be matched to the internal operating temperature and the local climate. The table below shows typical recommendations for cold storage and climate-controlled buildings:

Operating Temperature	Recommended Thickness	Typical Application
+15 to +25 degrees C	50 – 75mm	Food processing rooms, HVAC warehouses
+2 to +10 degrees C	75 – 100mm	Walk-in coolers, display storage
-18 to -25 degrees C	120 – 150mm	Frozen storage, distribution freezers
-35 to -40 degrees C	150 – 200mm	Blast freezers, cryogenic storage

3. Which surface steel is right for your environment?

For most cold storage and industrial applications, 0.5mm PPGI (pre-painted galvanized steel) is the standard choice. For coastal or high-humidity environments, Galvalume (AZ150) or stainless steel 304 provides better corrosion resistance. PVDF coating is recommended for exterior walls exposed to direct sunlight, while PE coating is sufficient for interior partitions. Food-processing facilities in direct product contact zones should specify stainless steel 304 or 316 with FDA-compliant paint.

4. How do tongue-and-groove and cam-lock joints work?

Joint Options for Cold Room Assembly:

Tongue-and-Groove (T&G): Standard for wall and roof panels. Panels slide together and are sealed with PU foam and silicone sealant at the joint.
Cam-Lock: Internal eccentric hooks embedded in the panel edge. Used for modular cold room panels where on-site assembly speed matters. Panels lock together with an Allen key, no bolts required.

5. Where are PIR sandwich panels commonly used?

Cold Storage and Freezers

Walk-in coolers, blast freezers, distribution warehouses, and refrigerated transport bodies where insulation directly determines operating cost.

Food and Pharma Facilities

Processing rooms, cleanrooms, and packaging areas requiring hygienic, washable walls that meet HACCP and GMP standards.

6. What should you check during cold room panel installation?

Joint quality is the single biggest factor separating catalog performance from real-world performance. Three things to verify: panels must be fully seated at tongue-and-groove joints with no gaps; all joints require continuous silicone sealant or PU foam on both sides for freezer applications; and vapor barriers must be continuous on the warm side to prevent condensation inside the panel core. Floor joints should extend below floor level for sub-zero rooms to prevent air leakage at the base.

Frequently Asked Questions (FAQS)

1. Can you supply cam-lock panels for modular cold room assembly?

Yes. We manufacture both standard tongue-and-groove panels and cam-lock panels with internal eccentric hooks. Cam-lock panels are typically used for modular walk-in cold rooms where on-site assembly speed is critical.

2. What is the difference between PIR and PUR sandwich panels?

PIR has better fire performance (chars rather than melts) and lower long-term thermal drift than PUR. PIR is now the standard choice for cold storage and food-grade construction, while PUR is still used in some cost-sensitive industrial roofing applications.

3. Do you provide accessories and installation guidance?

Yes. We supply matching corner pieces, U-channels, fixing kits, and silicone sealant. Installation manuals are provided with every order, and we can arrange on-site technical support for large projects.

4. What is the minimum order quantity and lead time?

MOQ is 300 sqm for standard specifications. Standard thicknesses and colors typically ship in 12-15 days. Custom colors, stainless steel surfaces, or special widths require 18-25 days.

5. Can the PIR panel ceiling support foot traffic for maintenance?

Standard PIR ceiling panels are not designed for regular foot traffic. For walkable ceilings, we recommend panels with thicker steel skins (0.6mm minimum) and denser foam core (45 kg/m3). Always use walkway planks distributed across multiple panel spans.

6. How are PIR panels packed for container shipping?

Both steel surfaces are protected with peel-off PE film. Panels are stacked on export wooden pallets with foam interlayers and strapped for 20ft or 40ft container loading. Standard 100mm wall panels load approximately 660 sqm per 40HQ.