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Sandwich panels can be used in high humidity environments. Sandwich panels are usually constructed of a double-layer steel plate and a layer of core material, which can achieve a good moisture-proof effect by selecting a core material and a steel plate with moisture-proof performance, and by the correct sealing installation method. High humidity environments (such as coastal buildings, food factories, cold storage) need to prevent moisture penetration and corrosion. The steel plate serves as the outer defense line. Galvanized/aluminum zinc coated steel plates (with PVDF or polyester coating, salt spray resistance, rust resistance) are preferred, avoid un-coated steel plates or ordinary plywood (easy to rust, Water-absorbent layer); the core material needs to avoid porous water-absorbent types (such as ordinary EPS foam, untreated rock wool), choose closed-cell or hydrophobic models ——polyurethane (PU, closed-cell rate exceeds 90%, less water absorption), extruded polystyrene (XPS, high density, moisture-proof), this type of core material can prevent moisture from intruding and losing heat preservation or mold, and breeding bacteria.    At the same time, when the sandwich panel is installed, the joints and screw holes of the sandwich panel need to be sealed with weather-resistant sealant (such as silicone glue, butyl tape) to prevent moisture from penetrating through the gaps; 50-100mm ventilation gap can be reserved for enclosed spaces (such as walls) to reduce internal condensation water; stainless steel screws or galvanized screws are selected, and waterproof gaskets are used avoid formation after rusting “tidal channels”. Meanwhile, check the panel coating regularly for breakage, sealant cracking, etc. If small defects are found, repair them promptly to prevent the vulnerability from expanding.   Currently sandwich panels are widely used in various high humidity environments, such as food/aquatic processing plants, cold storage/cold chain warehouses, factory buildings in rainy areas in the south, and underground space/civil air defense engineering with their excellent moisture-proof and impermeable properties, high-quality thermal insulation/insulation, corrosion resistance, and the ability to be installed quickly.

Metal roof panels can usually be installed on top of existing roofs. This “roof installation” scheme is relatively common in industrial plants, warehouses, and renovation of old buildings.   The metal roof panel itself is light in weight, with a conventional weight of 10-30 kg/㎡, which is much lower than the weight of the concrete roof (200-300 kg/㎡), and if the existing roof (such as concrete roof, steel roof) is structurally sound, it can carry additional loads without substantial reinforcement. And different corresponding solutions can be selected for different original roofs: the concrete roof is fixed with galvanized C-shaped steel purlins + expansion bolts, the old metal roof is connected with aluminum alloy keels (lightweight) + waterproof gasket screws, and the wooden roof is anti-corrosion Purlins can avoid damaging the original structure and are flexible.   If the existing roof waterproofing layer is intact and only slightly defective, it can be installed directly after cleaning. There is no need to remove the old roof, eliminating the cost of demolition and garbage removal. The construction period is more than 50% shorter than “demolition and reconstruction”. It is suitable for buildings that need to be quickly restored to use (such as factories and warehouses), with low cost and short construction period. At the same time, the metal roof panel also protects the original roof。At the same time, it can isolate rain, snow, and ultraviolet rays, extend the service life of the old roof base (such as concrete and wooden keels), and reduce the frequency of repair of the original roof. And General metal roof panels have low thermal conductivity, good thermal insulation performance, good fire protection performance, high safety factor, fire protection, wind resistance, and corrosion resistance (such as aluminum-magnesium-manganese plates, galvanized color steel plates), which can improve the overall disaster resistance of the roof. ability.   Overall, if the original roof structure is intact and the load-bearing capacity is sufficient, the installation of metal roof panels is a cost-effective renovation plan.

Good Quality Control Sandwich panel is the best choice for factories and warehouses in many industries. The panel is combined by two metal sheets with rock wool or eps/pu, pir foam in the middle. The production uses high-pressure combination process that makes panels strong enough for heavy industrial use. We have a strict testing of each panel before packing and loading.   Good Fire-Proof Performance Rock wool sandwich panel has a very good fire proof performance for industrial buildings. With 50mm thickness rock wool core, it will have 60 minutes of fireproof time. While the thickness increases to 100mm, and you get 120 minutes of fireproof time. This kind of sandwich panel will give people enough time to escape while on a fire.   Good Noise Control There is lots of loud machinery and equipment noise at some Industrial sites. As professional acoustic sandwich panel supplier, Propanel’s rock wool sandwich panels can keep down noise levels obviously. Rock wool noise-absorbing sandwich panel can effectively absorb noise and provide workers with a healthier working environment.   Energy-saving and Cost-saving  Although the initial cost may seem high, sandwich panel saves money in the long run. It’s insulation advantages reduce energy costs. The panel has anti-rust, anti-mold, and anti-pest performance with only common treatment. Most panels have 20 to 30 years life time and only needs basic cleaning work. Quick installation of less construction work also saves money for the project.

Sandwich panels can be customized for design and size to meet exact project specs for sure.    Common sandwich panel’s thickness varies from 30mm to 300mm, and lengths from 400mm to 12000mm. Factories use automated cutting for precision during production. Quality checks test thickness fittings and core density to ensure standards. While the core materials of sandwich panel also allow custom options: EPS for light weight, rock wool/glass wool for sound control and fire safety, and PU/PIR for better insulation. As professional rock wool panel china manufacturer as well as china cold storage panel manufacturer—PROPANEL, is engaged to give the best products to customer.   The metal surface layers include steel sheet, aluminum plate, or stainless-steel sheet... Inspections verify material bonds and fire ratings with lab tests.   The paint types of metal surface offer customization: PE for basic protection, HDP for higher durability, SMP for higher weather resistance, and PVDF for longer color life. Panels go through roller coating in production for even finish. This step follows strict color matching. Final quality detection uses visual and machine scans to confirm paint adhesion and thickness.   Special shapes sandwich panels like triangles or circles satisfy unique needs. Molds shape panels during manufacturing for custom fits. These handles curved or angled designs. Production ends with load tests and seal checks to confirm strength. Such special quality control ensures panels perform in all kinds of buildings’ roofs or walls.

Discover PROPANEL Sandwich Metal Roofing Systems PROPANEL sandwich metal roofing systems are a good choice for Large Projects. Made with a strong metal exterior and an insulating core, these panels resist extreme weather like heavy rain or strong winds. Whether it’s a warehouse or a factory project, PROPANEL gives a long-lasting solution that you can wait for.   Why Choose Sandwich Panels for Your Roof? Sandwich panels from PROPANEL bring more than just strength. The design has better heat insulation, making buildings super energy-efficient. This means lower heating and cooling bills for your building. The insulation also cuts down noise, perfect for busy industrial spaces. With PROPANEL, you get a roof that saves money and keeps things comfortable inside.   Easy Installation with PROPANEL One big advantage of PROPANEL sandwich metal roofing is how simple it is to install. The lightweight panels fit together quickly, saving time on big projects. No need for professional tools or long times—contractors will love how fast they can get the job done. PROPANEL’s prefab building material system means your roof is up and ready without any trouble.   PROPANEL: Built for Efficiency and Strength What makes PROPANEL so good for the building? It’s the combination of insulation and easy installation (prefabricated steel building materials). These sandwich roof panels keep buildings cooler in summer and warmer in winter, giving strong against for extreme weather. From storage rooms to large workshops, PROPANEL offers a reliable, low-maintenance roofing option that both better performance and value.

Compared with old-style single metal roof system’s definitely noisy, the modern insulated sandwich metal roof panels stepping in – they're right one that replace noisy metal into the quiet protection.    The Secret: Insulated Core Technology The key is what inside the middle of the sandwich panel. Each core material tackles noise differently while delivering bonus benefits.  ·Rock wool cores sandwich roof panels are the acoustic champions – those dense mineral fibers absorb sound waves, cutting rain noise by up to 40dB while providing Class A fire protection.  ·EPS cores sandwich roof panels offer the budget-friendly solution. Lightweight and affordable, reduce noise compared to single metal roof.  ·Then there's PU sandwich roof panels– the premium performer. With superior density and 0.02-0.024 W/(m·K) thermal values. The closed-cell structure blocks both sound transmission and heat transfer.   Real-World Sound Performance Single metal roofs noise is 55-60 DB during heavy rain – that's conversation-level noise disrupting sleep. Propanel's insulated metal sandwich panels drop this to 25-30 DB – quieter than a whisper!   Why Propanel Delivers Quiet Comfort Propanel insulated metal roof sandwich panels means to use noise-reduction technology. These panels install quickly while creating peaceful indoor environments that last decades. The quickly insulation stops both sound and energy waste.   

Building your dream home needs smart insulation choices. Traditional brick and mortar just can't compete anymore! That's where modern insulated sandwich panels step in--they're becoming the better solution for people who wants superior comfort, safety, and energy savings.    The Advantages of Different Sandwich panel Different type serves different residential needs perfectly. -Rock wool cores deliver exceptional fire resistance with Class A ratings, making them ideal for safety-conscious families.  -EPS (expanded polystyrene) cores offer the light weight champion – easy installation means faster construction and lower labor costs.  -Then there's PU (polyurethane) – the thermal performance king. With incredible insulation values around 0.02 W/(m·K).   The Insulated Panels’ Performance for Living Homes -Rock wool panels keep bedrooms quiet from street noise while protecting against fire.  -EPS panels transform garages and workshops affordably, with installation so simple that anyone can finish the work by himself.  -PU panels create comfortable living spaces where temperature stays consistent year-round, reducing energy waste consumption.   Why Propanel Delivers Home Comfort Propanel insulated panels install quickly, getting families into comfortable homes faster. The superior insulation stops energy waste, meaning lower utility bills month after month. For homeowners demanding safety, comfort, and long-term value, Propanel's sandwich panel solutions deliver the smart, reliable choice that transforms houses into energy-efficient spaces.  

The insulated wall panel is composed of 2 layers of galvanized steel plate (or aluminum plate) and a layer of insulation core material (EPS,PU and rock wool, etc.). Its environmental performance mainly depends on the insulation core material, from the following dimensions for comparative analysis.   Dimensions EPS PU（polyurethane） Rock wool Raw material and use release New materials are non-toxic and formaldehyde-free; inferior recycled materials may release VOCs. No release of high-quality products; TDI or harmful flame retardants are residual in low-quality products. No chemical release, but may produce dust irritating respiratory tract. Production and energy consumption Energy consumption is moderate, and VOCs pollution may occur in the treatment of recycled materials. Higher energy consumption, more environmentally friendly MDI process High energy consumption (ore melting needs high temperature), need to control dust Energy saving and carbon reduction Thermal insulation medium (thermal conductivity 0.033-0.038W/(m · K)) Optimal thermal insulation (thermal conductivity ≤ 0.024W/(m · K)), energy saving and carbon reduction is the strongest Weak insulation (thermal conductivity 0.040-0.048W/(m · K)) Combustion and Safety Flammable, flame retardant may release toxic fumes Flammable, high quality flame retardant smoke toxicity is low Non-combustible (Class A1), no toxic smoke Waste disposal Refractory degradation, low recycling rate Difficult to degrade, difficult to recycle Natural degradation, landfill without chemical pollution   In summary, high-quality PU wall panel energy-saving optimal, suitable for long-term energy-saving needs; high-quality EPS wall panel cost-effective, need to avoid recycling materials; rock wool wall panel fire prevention and waste environmental protection outstanding, but need to control dust. The core of environmental protection is "high-quality product selection"-organic materials to avoid inferior recycling materials, inorganic materials to choose low dust.Different choices can be made according to the different uses of the building.

The sound insulation and heat insulation performance of the insulated panels are significantly different from the different core material. The following four common types of EPS insulated panels, PU/PIR insulated panel, glass wool insulated panel and rock wool insulated panel are explained:   Property PU/PIR  Panel Rock wool/mineral wool Panel Glass Wool Panel EPS Panel Thermal Conductivity 0.022~0.024W/m·k 0.035~0.045W/m·k 0.03~0.04W/m·k 0.03~0.04W/m·k Density Low(36~43kg/m³) High(100~150kg/m³) Low(10~50kg/m³) Low(8~20kg/m³) Fire Resistance Moderate Excellent Excellent Poor Moisture Resistance High High Low Moderate Acoustic Performance Moderate Excellent Good Poor Cost  High Moderate Low Low   From the above table, the PU/PIR insulated panel has the lowest thermal conductivity and the best thermal insulation performance, followed by EPS. Because of its unique fiber structure, rock wool insulated panel has the best sound insulation effect, followed by glass wool. The EPS insulated panel has the highest cost performance. Users can choose according to different purposes.

Keeping seafood super-fresh needs seriously cold storage. Regular walls just not suitable! That's where specialized cold storage panels come in –they're absolutely essential for any seafood warehouse wanting top-quality fish and shellfish. Think of them as the super-insulated armor locking in the cold and keeping spoilage out.   The Heart of the Cold Room: PU/PIR Sandwich Panels The Best Choice for seafood cold rooms are PU/PIR: 0.02 W/(M·K) sandwich panels. Why? Their secret weapon is the super-dense, closed-cell foam core. This core acts like a powerful barrier, slashing energy bills by keeping cold air in and warm air out far better than other options. It also makes the panels strong and rigid, perfect for building large, reliable cold storage spaces. Propanel’s engineers these cores for maximum thermal efficiency, giving you cold you can count on.   Getting the Thickness Right Matters No. Fish Species Temperature Requirement (°C) PU Panel Thickness (mm) 1 Shellfish (e.g., Mussels, Oysters) 0 to 5 75 2 Fresh Fish (e.g., Cod, Haddock) -5 to 0 100 3 Frozen Shrimp, Crab, Lobster -15 to -30 150 4 Fatty Fish (e.g., Salmon, Mackerel) -18 to -24 120 5 Tuna (High-Quality) -45 to -60 200 Notes:  -Fresh fish require near 0°C for short-term storage (1-2 days) to prevent bacterial growth.  -Fatty fish need lower temperatures to preserve oils and flavor.  -Tuna demands ultra-low temperatures to maintain premium quality.  -PU panel thickness ensures thermal insulation and energy efficiency, with thicker panels for lower temperatures to minimize heat transfer.  -All panels are FM-certified with a closed-cell PU/PIR core for moisture resistance and durability.   Why Propanel PU/PIR Panels Win for Seafood？ Choosing Propanel PU/PIR sandwich panels means creating the perfect cold, stable home for your seafood. This stops freezer burn, slows down spoilage, and keeps fish fresher for longer – meaning less waste and happier customers. Plus, they install quickly, getting your valuable cold storage space up and running fast. For seafood warehouses demanding peak freshness, lower costs, and reliable performance, Propanel's PU/PIR solutions are the smart, proven choice.

What is a PU panel?   A PU sandwich panel is a sandwich panel building material consisting of two outer layers (typically metal sheets, such as steel or aluminum) sandwiching a core of polyurethane (PU) foam. It’s widely used in construction for walls, roofs, and partitions due to its excellent thermal insulation, lightweight structure, and durability.    Here’s a concise breakdown Components:     1. Outer Layers (Skins): Thin, rigid sheets (galvanized steel or aluminum) provide structural strength, weather resistance, and aesthetic finish.     2. Core (Polyurethane Foam): PU foam, BASF supplier the chemical with a high-performance insulator, offers low thermal conductivity (typically 0.02–0.025 W/m·K), making it ideal for temperature control.   Key Features: •Insulation: Superior thermal efficiency, suitable for applications like cold storage or poultry housing (from your Group 5). •Thickness: Common thicknesses include 30mm, 40mm, 50mm, 100mm, or 150mm , affecting insulation performance. •Applications: Used in steel structures, 4S car shops, cold storage, and roofing/wall systems (Group 5), often with certifications like CE or FM approval  •Advantages: Lightweight, fire-resistant (to a degree), easy to install, and cost-effective compared to other materials like PIR or ROCKWOOL. •Limitations: Less fire-resistant than PIR; environmental concerns due to PU’s chemical composition          

sandwich panels, such as polyurethane (PU) and rock wool sandwich panels, are transforming modern construction with their superior insulation, fire resistance, and eco-friendly properties. These versatile materials are ideal for walls, roofs, and cleanrooms, offering tailored solutions for diverse building needs.   Exceptional Thermal Insulation   PROPANEL's Polyurethane Pu sandwich panels deliver outstanding thermal performance. A 50mm PU panel matches the insulation of a 1720mm brick wall, significantly reducing energy costs. Its low thermal conductivity prevents heat loss and condensation, maximizing building efficiency. Similarly, rockwool panels, with their fine, flexible fibers, offer excellent insulation due to a low thermal conductivity coefficient. This ensures stable indoor temperatures, making both options perfect for energy-efficient structures like warehouses and cold storage units.   Superior Fire Resistance   Fire safety is critical in construction. PROPANEL's PU sandwich panels achieve a B1 fire rating with self-extinguishing properties, ensuring reliable protection. While Rock wool sandwich panels excel further, meeting the A-grade fire standard thanks to their hydrophobic rockwool core, which resists flames effectively. These fire-resistant qualities make both panel types suitable for high-safety environments like factories and cleanrooms.   Eco-Friendly and Sustainable Both PU and rock wool panels are environmentally friendly. Their easy installation and recyclability boost material reuse, reducing waste. By minimizing energy consumption through excellent insulation, these panels support green building practices, aligning with sustainable construction trends.   Versatile and Customizable   sandwich panels come in diverse types and designs, meeting varied aesthetic and functional needs. From sleek finishes to custom sizes, they cater to personalized requirements for projects like prefab houses and commercial buildings. This versatility enhances their appeal across industries.       Space-Saving Design   With ultra-low thermal conductivity, these panels achieve high insulation with minimal thickness, reducing wall dimensions and expanding usable interior space. This makes them ideal for modern architecture prioritizing efficiency and comfort.