PIR Panels
Square polyisocyanurate (PIR) sandwich panels are made in our own factory on three continuous German Hennecke foaming lines for cold storage warehouses, freezers, and clean food processing rooms.
With ≥93% closed cell foam, thermal conductivity ≤0.022 W/(m·K), and tight cam lock joints, panels are cut up to 12 m long with SUS304 or SUS316 stainless steel, coated steel, or aluminum skins.
In our own factory German Hennecke continuous PIR foaming line (λ ≤ 0.022 W/(m·K))
FM Approved & GB 8624 B1 (B-s2,d0,t1) flame retardant core
SUS304/SUS316 stainless steel, color coated steel, or aluminum facings
Panel thicknesses from 50 to 250 mm cut to custom project lengths
Precision cam lock and tongue and groove joints with integrated thermal breaks
Product Features
Why Choose Square's PIR Panels
High insulation value, B1 and FM fire ratings, strong core bonding, and tight cam lock joints.
Thermal Resistance
- Closed cell content ≥ 93%
- Water absorption ≤ 3%
- Initial thermal conductivity λ ≤ 0.022 W/(m·K) per EN 13165
- Minimizes cold room heat gain and compressor running hours
FM Approved & B1 Flame Retardant Core
Tested to GB 8624-2012 Grade B1 and DIN 4102 fire standards, and certified to FM 4880 Approval for insulated building panels.
Zero ODP Pentane Foaming
Produced using zero ODP, low GWP n pentane high pressure foaming completely free of CFCs, HCFCs, and HFCs.
High Compressive & Bonding Strength
Through thickness compressive strength ≥ 140 kPa and skin to core tensile bonding strength ≥ 100 kPa support long span ceilings and high bay cold storage walls.
Hygienic Metal Facings & Profiles
Available with smooth or ribbed coated steel, SUS304 or SUS316 stainless steel, or embossed aluminum skins for wet washdown rooms.
Rapid Cam Lock & Modular Assembly
Panels are cut to length at our factory with built in cam locks and tongue and groove seals for fast site assembly.
Hygiene and Food Safety
Airtight joint seals and nonporous food grade metal skins prevent moisture ingress, condensation, and mold or bacterial growth in chilled and frozen food zones.
Technical Specifications
Parameters
Standard specifications are listed below. We customize panel thickness, steel skins, coatings, and cut lengths for your project.
| Core material | PIR (Polyisocyanurate) rigid foam, closed cell structure (≥ 93%) |
|---|---|
| Production line | German Hennecke continuous high pressure foaming line (in our own factory) |
| Panel thickness | 50 / 75 / 100 / 120 / 150 / 200 / 250 mm |
| Standard width | 1,000 mm or 1,200 mm (custom widths available) |
| Panel length | Up to 12,000 mm (transport limited); custom lengths on request |
| Thermal conductivity (λ initial) | ≤ 0.022 W/(m·K) (per EN 13165) |
| Thermal conductivity (λ aged) | ≤ 0.026 W/(m·K) (20 year accelerated aging) |
| Fire rating | GB 8624-2012 B1 (B-s2,d0,t1) / DIN 4102 B1 B2 / FM 4880 Approved |
| Foam density | 38 to 42 kg/m³ (standard) |
| Skin materials | Color coated steel / Stainless steel (SUS304, SUS316) / Aluminum |
| Skin thickness | 0.4 to 0.8 mm (per structural requirement) |
| Joint system | Cam lock with integrated thermal break; tongue and groove profile |
| Typical lead time | 4 to 8 weeks (cut to order production) |
| Design life | 25+ years (thermal); 20+ years (structural in normal environment) |
Design Details
How Each Subsystem Is Engineered
Open each section below to see how our PIR panels are built and installed.
PIR vs. PU vs. EPS: Material Comparison
PIR (Polyisocyanurate): Highest fire performance among organic insulation foams; chars to form a protective carbon layer rather than melting. λ ≤ 0.022 W/(m·K). GB 8624 B1 and FM 4880 fire ratings.
PUR (Polyurethane): Good thermal insulation (λ ≈ 0.024 W/(m·K)), but lower thermal stability and fire resistance than PIR.
EPS (Expanded Polystyrene): Higher thermal conductivity (λ ≈ 0.035 to 0.040 W/(m·K)) and lower compressive strength; unsuitable for subzero industrial freezers where moisture vapor drive is high.
For food processing facilities and cold storage warehouses, Square recommends PIR as the optimal balance of fire safety, thermal efficiency, and structural longevity.
Cam Lock System & Thermal Break
The cam lock joint is the critical interface:
- Cam mechanisms spaced at 300 to 500 mm along each vertical joint
- Quarter turn engagement draws panels together with 2 to 3 mm compression on the joint seal
- Integrated thermal break: nonmetallic strip prevents metal to metal contact between interior and exterior skins
- Tongue and groove profile with dual sealing lips: one warm side, one cold side
- Assembly speed: 2 to 3× faster than traditional screw fixed panels
Factory Manufacturing Advantage
Square operates an in our own factory continuous German Hennecke high pressure foaming line:
- Full control over foam formulation, closed cell ratio (≥ 93%), and density (38 to 42 kg/m³)
- Custom panel lengths cut directly to your facility height
- No dependency on independent panel suppliers for freezer enclosures or cold rooms
- Full batch traceability linked to quality control laboratory test records
Panel Selection by Application
Freezer rooms (−18°C to −25°C): 150 to 200 mm PIR. Stainless steel or coated steel interior with continuous vapor barrier.
Chiller rooms (0°C to +4°C): 100 to 120 mm PIR. Color coated or stainless steel per hygiene zone.
Food processing halls: 75 to 100 mm PIR. SUS304 stainless steel interior for daily CIP and high pressure washdown.
Blast & spiral freezers (−35°C to −40°C): 150 to 250 mm PIR. Stainless steel throughout with floor frost heave protection.
Installation & Site Support
Square provides full installation support:
- Pre installation: detailed panel cutting schedule; all panels precut to length before shipping
- Installation: Square supervisor on site, or full installation team available
- Joint sealing: food grade silicone sealant applied to all internal joints
- Quality verification: thermal imaging survey after installation to identify any thermal anomalies
Proven in These Food Applications
Cold Storage
High insulation wall, ceiling, and floor panels for cold storage warehouses and distribution centers.
Food Processing Halls
Food safe SUS304/SUS316 stainless steel and coated steel partition systems for hygienic meat, seafood, dairy, and bakery processing rooms.
Blast Freezer Enclosures
Thick core (150 to 250 mm) PIR enclosures engineered for −35°C to −60°C blast freezers, spiral freezers, and ultra low temperature tuna rooms.
Clean Rooms
Airtight, flush joint insulated walls and ceilings for pharma cold rooms, cleanrooms, and controlled atmosphere storage.
Case Studies
PIR Panels in Operation Worldwide
Proven installations running in food plants around the world.
20,000 m² Cold Chain Logistics Center
Square Technology supplied Hennecke PIR insulated panels, cold storage doors, and the central refrigeration package
Box in Box Cold Storage Deployment in North America
Modular PIR insulated cold room envelopes and refrigeration packages engineered inside existing dry warehouse shells
Anji Group Cold Storage Facility
Complete PIR insulated enclosure panels and industrial refrigeration packages supplied for Anji Group's multiple temperature
Galaxyson Food Cold Storage and Refrigeration Project
Turnkey cold storage insulation and centralized refrigeration system delivered for Galaxyson Food's processing and distribution
Frequently Asked Questions
No. Square panels have ≥93% closed cell content, excellent airtightness, and ultra low water absorption (≤3%), preventing moisture intrusion and mold growth.
Yes. With compressive strength ≥140 kPa and bonding strength ≥100 kPa, our PIR panels are engineered to support high rise cold storages and demanding industrial environments.
Square holds ISO 9001, ISO 45001, CE, PED, ASME (U and U2 stamps), EAC, CSA, CRN, and CNAS laboratory accreditation, supported by 300+ patents, 300+ R&D engineers, and 300+ installation and service engineers.
We supply custom PIR insulated panels from 50 to 250 mm thick manufactured on our continuous German Hennecke line, with a wide choice of stainless steel or color-coated steel skin patterns, colors, and finishes for both interior and exterior walls and ceilings.
PIR (polyisocyanurate) panels are rigid foam insulation panels with superior fire resistance (tested to GB 8624-2012 Grade B1), high thermal stability, low thermal conductivity (≤ 0.022 W/(m·K)), and lower smoke emissions compared to standard PUR (polyurethane) panels, making them ideal for cold storage and food processing facilities.
Engineering Inquiry
Discuss Your PIR Panel Project
Share your room dimensions and target temperature for a PIR panel quote.
