Metal Faced Sandwich Panels

Modern metal faced sandwich panels are the mainstay of global industrial buildings, cold chain logistics, cleanroom engineering, and high-standard warehousing systems, representing a mature technology in the prefabricated building supply chain. They are created by continuously combining high-strength metal panels with different thermally insulating and fire-resistant core materials on a production line, perfectly solving the rigid requirements of building shell temperature control, fire resistance, high turnover, and low maintenance costs.

To address the different geographical climates, fire regulations, and budget constraints in various regions worldwide, metal-faced sandwich panels have evolved into five main core categories.

1. Metal-Faced Rock Wool Panels

Rock Wool Sandwich Panels

Structural Features: The core uses high-density, longitudinally arranged high-quality hydrophobic rock wool, and the edges are usually sealed with polyurethane (PU) to block moisture.

Core Advantages: Globally recognized as an "absolutely non-combustible" top-tier material. Melting point exceeds 1000℃, combined with excellent sound insulation and noise reduction performance (Rw≥30dB). Due to the oriented fiber arrangement, its shear resistance and wind load resistance are equally robust.

Fireproof Applications: Widely used in high-risk/multi-heat-source heavy industrial plants (such as chemical plants and automobile manufacturing workshops), multi-story building firewalls, and large-area commercial complex exterior walls. Fire resistance ratings can reach 1–4 hours, easily passing the world's most stringent fire safety inspections.

2. Metal-Faced Foam Sandwich Panel

EPS Sandwich Panels

Structural Features: The core uses modified polystyrene foam (EPS) injected with flame retardants, a classic lightweight and cost-effective building material.

Core Advantages: Ultimate cost-effectiveness and the king of lightweight construction. Extremely lightweight, only 1/20th the weight of traditional concrete walls, significantly reducing the load and initial investment costs of the main steel structure. On-site dry assembly in a modular fashion can directly halve local labor costs.

Fireproof Applications: Fireproof Applications: After modification, it achieves a flame-retardant rating of B1/B2 (self-extinguishing, does not spread fire). Widely used in cost-sensitive light industrial processing workshops, agricultural hydroponic rooms/greenhouses, overseas mining camp mobile homes, and basic cleanroom partitions within factory buildings.

3. Metal-Faced Polyurethane Panel

PU Sandwich Panels

Structural Features: The core is made of rigid polyurethane (PU) or modified polyisocyanurate (PIR) through high-pressure continuous foaming, with a closed-cell rate ≥95%.

Core Advantages: Undisputed king of thermal insulation efficiency. It boasts an extremely low thermal conductivity (≤0.022W/(m⋅K)) among engineering building materials, seamless tongue-and-groove joints, 100% eliminating cold bridges and condensation on interior walls, directly reducing cooling/heating electricity costs for owners by over 35%.

Fireproof Applications: The upgraded PIR rapidly forms a graphitized carbonized layer on its surface when exposed to fire, preventing flame spread and achieving a B1 flame-retardant rating. It is the absolute first choice for modern global cold chain logistics centers, cold storage facilities, high-cleanliness food processing workshops, and data centers.

4. Metal-faced Magnesium Oxide Panel

Structural Features: Uses a modified magnesium oxide board (or magnesium oxide mesh) with a ternary system of magnesium oxide, magnesium chloride, and water as the core support.

Core Advantages: Extremely high rigidity and flatness matrix. Extremely high surface hardness, strong impact resistance, and naturally waterproof, moisture-proof, and mildew-proof.

Fireproof Applications: Class A non-combustible material. Due to its surface's resistance to particle adsorption and frequent chemical disinfectant cleaning, it is the first choice for indoor ceilings and partitions in semiconductor chip cleanrooms, biomedical sterile isolation areas, and operating rooms with extremely high requirements for fire resistance and cleanliness.

5. Metal-faced Silica Rock Panel

Structural Features: Made with polystyrene resin as the matrix, coated with inorganic fire-retardant mineral materials through a special process and then molded and cured, presenting a honeycomb structure.

Core Advantages: A cutting-edge technology perfectly balancing the fire resistance of rock wool and the lightweight properties of EPS. It overcomes the drawbacks of traditional rock wool, such as easy water absorption and collapse, and skin irritation, while eliminating the fire resistance issues of ordinary foam boards. It boasts extremely low water absorption and high compressive strength.

Fire Resistance Applications: Fire rating up to A2 (near non-combustible). Widely used in modern electronic cleanrooms, precision instrument manufacturing workshops, and high-standard interior partitions for food and pharmaceutical purification projects.

Comparison of Core Product Category Technical Parameters

To facilitate technology selection and cost calculation for global contractors and investors, the core physical parameters of the five types of boards are systematically summarized below.

Panel Type	Core Density	Thermal Conductivity	Fire Rating	Water Absorption / Moisture Resistance	Core Benefit Tag	Top Applications
Rock Wool Sandwich Panel	100 - 140 kg/m³	≤ 0.043W/(m.K)	Class A1 (Non-combustible)	Relatively Weak (Requires PU side sealing)	Absolute fire protection, excellent acoustic insulation	Heavy industry/anti-corrosion plants, commercial complexes, firewalls
EPS Sandwich Panel	12 - 20 kg/m³	≤ 0.041W/(m.K)	Class B1/B2 (Self-extinguishing)	Extremely Low (Naturally moisture-proof)	Ultimate cost-effectiveness, ultra-lightweight	Light industry warehouses, prefabricated modular houses, hydroponic rooms
PU/PIR Sandwich Panel	38 - 42 kg/m³	≤ 0.022W/(m.K)	Class B1 (PIR aligns with US standard)	≤1.0% (Superb moisture barrier)	Ultimate thermal insulation, eliminates thermal bridging	Large-scale cold chain logistics, food processing, energy-efficient warehouses
Glass Magnesium Panel	≥ 1000 kg/m³ (High density)	≈ 0.20W/(m.K)	Class A (Non-combustible)	Extremely Low (Waterproof, mold-resistant)	Extreme surface flatness, superior impact resistance	Semiconductor cleanrooms, biopharmaceutical plants, operating theatres
Silicon Rock Panel	80 - 100 kg/m³	≤ 0.045W/(m.K)	Class A2 (Nearly non-combustible)	≤2.0% (Excellent water resistance)	Golden balance between fire protection and light weight	Electronic purification workshops, precision manufacturing, constant-temp partitions

Closed-Loop Supply Chain Delivery

Regardless of the core material chosen for the metal faced sandwich panels, relying on the global one-stop managed service of Canglong Group's digital intelligent large-scale factory, the following supply chain benefits can be secured.

One-stop, complete kit shipping: In addition to the sandwich panels themselves, the package includes aluminum alloy inner R-angle fittings (cleanroom specific), a flashing system, large-capacity gutter downpipes, and high-strength anti-seepage bolts and washers, completely eliminating work stoppages and losses caused by missing parts at overseas sites.

Construction time and local labor costs are halved: All panels are 100% precisely cut and assembled in our China base according to BIM drawings. After unpacking at the destination port, all panels are rigidly interlocked with tongue and groove bolts, eliminating on-site welding and secondary trimming. This industrial-block-like assembly speed helps your global assets go into production rapidly, seizing business opportunities in ever-changing geographical environments.