Joint Star Steel manufactures continuous automated sandwich panels that combine high-tensile coated steel skins with high-density thermal cores. Designed to mitigate thermal bridging, protect interior environments, and drastically cut operational energy expenses.
Our sandwich panels serve as prefabricated composite building elements widely utilized across building envelopes, partition walls, and clean ceilings. Composed of two exterior metal facings continuously bonded to a rigid core—mineral wool, polyurethane (PU/PIR), or expanded polystyrene (EPS)—they deliver verified structural integrity, airtight hermetic interlocks, and low heat transmittance.
From industrial sheds and poultry control facilities to pharmaceutical cleanrooms and sub-zero cold chains, our manufacturing facilities adhere to strict dimensional tolerances and coating standards, ensuring dependable field assembly across regional and international project sites.
Optimal building envelope performance begins with the right thermal core. We formulate and laminate three specialized insulation materials in-house.
Economical & Lightweight Manufactured using closed-cell expanded polystyrene beads, delivering reliable thermal insulation at the most competitive price point per square meter. Fast handling, minimal dead-load, and high moisture resistance.
Maximum Thermal R-Value Formulated with rigid polyurethane foam featuring over 95% closed-cell structure. Offers the lowest thermal conductivity available, achieving superior temperature stability in cold storage and food processing facilities.
Non-Combustible Fireproof Constructed with high-density basalt mineral fiber bonded perpendicular to steel faces. Delivers Class A1 non-combustible fire protection, 1 to 4 hour fire ratings, and exceptional acoustic sound absorption for demanding industrial plants.
Standard technical specifications. Custom dimensions, skin thicknesses, and surface finishes are manufactured upon client project approval.
| Parameter | EPS Sandwich Panel | PU / PIR Sandwich Panel | Rock Wool Sandwich Panel |
|---|---|---|---|
| Core Material | Expanded Polystyrene (Self-extinguishing) | Rigid Polyurethane / Polyisocyanurate | Hydrophobic Basalt Mineral Wool Fibers |
| Panel Thickness Available | 50 mm, 75 mm, 100 mm, 150 mm | 50 mm, 75 mm, 100 mm, 120 mm, 150 mm, 200 mm | 50 mm, 75 mm, 100 mm, 150 mm, 200 mm |
| Facing Steel Sheet Thickness | 0.35 mm – 0.60 mm (PPGI / PPGL) | 0.40 mm – 0.70 mm (PPGI / PPGL) | 0.45 mm – 0.70 mm (PPGI / PPGL) |
| Core Density | 12 – 20 kg/m³ | 38 – 42 kg/m³ | 80 – 120 kg/m³ |
| Thermal Conductivity (λ) | ≤ 0.038 W/(m·K) | ≤ 0.022 W/(m·K) | ≤ 0.040 W/(m·K) |
| Effective Cover Width | Roof: 950 mm | Wall: 950 / 1150 mm | Roof: 960 / 1000 mm | Wall: 1000 / 1120 mm | Roof: 950 mm | Wall: 950 / 1150 mm |
| Fire Resistance Class | B2 (Fire Retardant available) | B1 / Class 1 (PIR formulation) | Class A1 (Non-combustible, up to 4 hrs) |
| Joint Configuration | Overlap Cap / Tongue-and-Groove | Double-groove Tongue / Cam-lock / Hidden screw | Deep tongue-and-groove with fixing cap |
| Operating Temperature | -30°C to +75°C | -60°C to +100°C | -50°C to +250°C |
Our sandwich panel systems are proven in operation across specialized industrial sectors with stringent temperature, hygiene, and environmental controls.
Thick PU panels (120mm – 200mm) engineered with internal cam-locks, heavy vapor barriers, and antibacterial coatings to prevent frost-heave and eliminate temperature loss down to -40°C.
Continuous insulation mitigates extreme outdoor solar radiant heat, stabilizing internal climate conditions for poultry breeding, feed security, and livestock mortality reduction.
GMP-compliant flush-surface panels with silicone-sealed coving, anti-static food-grade PVDF coatings, and complete chemical resistance against frequent washdowns.
Fast-erecting external roof and wall panels capable of large purlin spans. Drastically reduces structural steel requirements while providing year-round acoustic and thermal comfort.
Rock wool core structural partitions delivering up to 4 hours of passive fire containment, protecting personnel, electrical substations, and flammable chemical storage.
Lightweight modular enclosures that add floor space on existing building terraces without compromising structural load margins or requiring structural reinforcement.
Every batch of sandwich panels produced by Joint Star Steel undergoes systematic testing to ensure structural adhesion, fire compliance, and weather tightness.
Coil yield strength, zinc mass (90 to 275 g/m²), and paint topcoat dry film thickness (DFT) verified before roll forming.
High-pressure continuous injection and automated laminating tracks maintain uniform core density and eliminate air pockets.
Destructive sample tests confirm maximum bond adhesion between steel facings and the core insulation under extreme stress.
Protective PE peelable films, edge protectors, heavy-duty banding, and moisture-sealed wrapping suited for international sea freight.
Key information for commercial contractors, overseas buyers, and mechanical engineers selecting sandwich panel assemblies.
Polyurethane (PU/PIR) is best when thermal efficiency and vapor tightness are the primary objectives, particularly in cold storages (-40°C to +10°C), cleanrooms, and food processing lines. Rock Wool is required when Class A1 non-combustible fire protection or high acoustic damping is mandated. EPS is the optimal economical choice for general warehousing, modular site offices, and partition walls.
For chilled storage (+0°C to +8°C), 75mm to 100mm PU panels are standard. For deep-freeze environments (-18°C to -25°C), 120mm to 150mm PU panels are specified. For blast freezers (-30°C to -40°C), 150mm to 200mm panels with cam-lock interlocks and double-groove vapor seals are required.
Yes. We offer pre-painted galvanized steel (PPGI) and Aluzinc (PPGL) facings ranging from 0.35mm to 0.7mm. Surface treatments include food-safe antibacterial coatings, PVDF for harsh exterior environments, and corrosion-resistant SMP coatings in customized RAL colors.
Each panel is surfaced with peelable protective polyethylene film. Panels are stacked with corner protectors, secured onto EPS foam skids, banded with heavy-duty polyester strapping, and wrapped in moisture-barrier plastic film for secure 20ft or 40ft high-cube sea container shipping.