Cold Storage & Blast Freezers
Used extensively in walk-in freezers, meat and seafood processing plants, and fruit preservation cold rooms requiring strict temperature control from -5°C to -40°C.
Engineering Excellence
High-Performance Polyurethane (PU) Sandwich Panels
Joint Star Steel manufactures premium rigid PU (Polyurethane) and PIR (Polyisocyanurate) sandwich panels engineered to provide superior thermal resistance, airtight joint integrity, and structural strength for temperature-critical industrial facilities.
≤ 0.022 W/m·K
Thermal Conductivity (K-Value)
40 - 42 kg/m³
Rigid PU Foam Core Density
≥ 95%
Closed-Cell Water Impermeability
B1 / B2 Grade
Fire Retardant Standard
Polyurethane (PU) Roof Panels
Designed with high-rib corrugated profiles for superior load-bearing capacity and weather-tight overlap joints. Prevents water ingress while drastically reducing thermal heat transfer on large-span industrial factory roofs.
- High ribbed design for enhanced snow and rain load resistance
- Hidden fastener option to eliminate roof leakage risks
- Custom core thickness from 50mm to 150mm
Polyurethane (PU) Wall Panels
Manufactured with precision tongue-and-groove or eccentric cam-lock joint connections to ensure airtight thermal insulation and rapid on-site assembly for cold storage rooms, cleanrooms, and exterior walls.
- Seamless tongue-and-groove fit eliminates thermal bridging
- Cam-lock mechanism available for modular cold room assembly
- Smooth, micro-rib, or embossed metal surface finishes
Key Advantages
Why Overseas Buyers Choose Our PU Panels
Polyurethane core insulated panels offer unmatched physical and thermal efficiency parameters, guaranteeing low operating energy costs and extended structural lifespan for commercial and industrial facilities.
Maximum Thermal Efficiency
With thermal conductivity as low as 0.022 W/m·K, PU panels provide twice the insulation performance of EPS core panels of identical thickness, dramatically cutting cooling and heating power costs.
Fire Retardant & Self-Extinguishing
Formulated with advanced fire-retardant additives complying with DIN 4102 B1/B2 fire standards. The rigid foam core carbonizes during high-heat exposure without dripping or propagating fire.
Moisture & Corrosion Resistance
Over 95% closed-cell structure prevents moisture absorption, vapor condensation, and fungal growth, maintaining long-term structural integrity in humid tropical climates and cold rooms.
High Mechanical Load Strength
Continuous foam injection bonding creates a cohesive composite structure with PPG1 steel skins, delivering high flexural strength, shear resistance, and wind-load stability.
Airtight Joint Connection
Engineered joint designs—including hidden screw and cam-lock configurations—ensure vapor-tight seals, preventing cold air leakage in refrigeration chambers and cleanrooms.
Rapid Modular Construction
Lightweight prefabricated design allows fast crane lifting and quick manual installation, cutting overall construction schedules by up to 50% compared to traditional concrete masonry walls.
Technical Parameters
Polyurethane Sandwich Panel Specifications
We manufacture custom PU and PIR sandwich panels tailored to client engineering drawings, temperature requirements, and regional structural loading codes.
| Specification Item | Wall Panel Parameters | Roof Panel Parameters |
|---|---|---|
| Core Material | Rigid Polyurethane (PU) / Polyisocyanurate (PIR) Foam | Rigid Polyurethane (PU) / Polyisocyanurate (PIR) Foam |
| Core Foam Density | 40 kg/m³ – 45 kg/m³ (±2) | 40 kg/m³ – 45 kg/m³ (±2) |
| Panel Thickness Options | 50mm, 75mm, 100mm, 120mm, 150mm, 200mm | 50mm, 75mm, 100mm, 120mm, 150mm |
| Effective Coverage Width | 950mm / 1000mm / 1150mm | 950mm / 1000mm |
| Outer / Inner Steel Facing | 0.4mm – 0.7mm PPGI Color Steel / Galvalume / Stainless Steel | 0.4mm – 0.7mm PPGI Color Steel / Galvalume / Stainless Steel |
| Thermal Conductivity | ≤ 0.022 W/m·K | ≤ 0.022 W/m·K |
| Fire Rating Classification | DIN 4102 B1/B2 Grade / EN 13501-1 B-s2,d0 | DIN 4102 B1/B2 Grade / EN 13501-1 B-s2,d0 |
| Closed-Cell Content | ≥ 95% impermeability | ≥ 95% impermeability |
| Joint Mechanism | Tongue & Groove / Cam-Lock / Hidden Screw | Overlapping Joint with Weather-Proof Rib Seals |
| Applicable Temperature | -50°C to +100°C | -40°C to +90°C |
Industry Use Cases
Primary Engineering Applications
Our rigid PU insulated sandwich panels are globally deployed across demanding industrial, commercial, and temperature-sensitive facilities.
Pharmaceutical Cleanrooms
Provides dust-free, seamless wall and ceiling enclosures meeting GMP cleanroom hygiene standards for medicine manufacturing, biotechnology labs, and electronics plants.
Industrial PEB Buildings & Warehouses
Ideal roof and wall cladding solution for large-scale logistics centers, manufacturing workshops, and commercial distribution hubs requiring energy conservation.
Rigorous Quality Assurance
Continuous Production & Export Standard Packing
From raw material chemical formulation to final sea-worthy export bundling, Joint Star Steel maintains strict ISO-standard quality controls.
Factory Capability
Precision Automated Continuous Line
Our high-pressure PU foaming production lines utilize automated chemical metering and precise temperature curing tunnels. This ensures consistent core density, uniform foam distribution, and zero delamination between steel skins and polyurethane core.
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High-Pressure Polyurethane Foaming
Accurate two-component polyol and isocyanate mixing produces uniform micro-cellular foam with high strength.
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Online Protective Film & Trimming
Automatic application of protective PE film preserves pre-painted steel surface finishes during transport and installation.
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Seaworthy Bundle Packaging
Panels are wrapped with moisture-proof plastic film, reinforced with corner protectors, and palletized for safe container loading.
100% Quality Inspected Prior to Shipment
Technical FAQ
Frequently Asked Questions
Technical guidance for procurement officers, cold room builders, and structural engineering consultants.
Why are Polyurethane (PU) sandwich panels preferred for cold storage buildings?
Polyurethane (PU) core provides the lowest thermal conductivity (≤ 0.022 W/m·K) among all commercial insulation building materials. Its closed-cell rate exceeds 95%, blocking thermal transfer and moisture penetration to minimize refrigeration power consumption.
What core densities and panel thicknesses are available for export orders?
We manufacture PU sandwich panels with rigid foam density ranging from 40 kg/m³ to 45 kg/m³. Panel thicknesses range from 50mm to 200mm, with PPGI galvalume or stainless steel skin gauges from 0.4mm to 0.7mm.
What joint systems do you offer for airtight cleanroom and cold room installations?
We offer precision tongue-and-groove joints, hidden screw joint systems, and eccentric cam-lock mechanisms designed to ensure seamless vapor sealing, structural tightness, and zero thermal bridging.
What fire resistance standards do your PU sandwich panels meet?
Our PU/PIR formulation utilizes fire-retardant additives complying with DIN 4102 B1/B2 class and EN 13501-1 standards, self-extinguishing upon flame source removal.
Request Technical Drawings & Factory Pricing
Send us your project specifications, required core thickness, and building dimensions. Our engineering specialists will provide custom CAD layouts, thermal calculations, and competitive FOB/CIF quotation.
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