In today’s fast-paced global supply chain, warehouse is not only transit stations for goods, but also the core battlefield for enterprise assets. From cold chain fresh produce to precision instruments, from chemical raw materials to e-commerce packages, the risks that warehouses need to deal with are far beyond imagination. A sudden fire may turn the inventory into ashes, a rainstorm may lead to wall leakage, and a collision may damage the structure.
How to build a copper and iron wall for the warehouse? The answer may lie in two common building materials: PU sandwich panels and color steel metal sheet. They are becoming the golden partner for warehouse protection due to their complementary functions and scene adaptation.
First protection: PU sandwich panel
PU sandwich panel, full name of polyurethane sandwich panel, is a building material composed of two layers of high-strength metal panels (color steel plate, galvanized plate, etc.) and a layer of polyurethane (PU) foam core material. The seemingly ordinary “sandwich” structure hides three core protective abilities.
Fireproof strength: Polyurethane itself is difficult to ignite (with a combustion level of up to B1), and when exposed to fire, it will form a dense carbonization layer to prevent the spread of flames. Combined with the fire resistance of metal panels (such as galvanized steel plates with a melting point exceeding 1000 ℃), the overall fire performance can meet the fire protection standards of most national warehouses (such as EU EN 13501-1 and China GB 8624). For chemical warehouses storing flammable materials such as paint and solvents, or precision warehouses sensitive to high temperatures such as electronic components and pharmaceuticals, PU sandwich panels can effectively reduce the risk of fire spread.
Thermal insulation stabilizer: Polyurethane is currently one of the insulation materials with the lowest thermal conductivity (about 0.022W/(m · K)), equivalent to the insulation effect of 1-meter-thick concrete. In tropical regions, it can block external heat intrusion and keep the cold storage below -18 ℃. In cold regions, it can also reduce indoor heating loss and lower energy consumption. For cold chain logistics and food warehousing, a stable temperature environment is directly related to the quality of goods. A serving of ice cream will not melt due to high temperatures in summer, and a box of vaccines will not fail due to low temperatures in winter.
Anti impact protection armor: The outer metal panel (usually 0.4-0.6mm thick) combined with the toughness of the polyurethane core material enables the PU sandwich panel to withstand accidental collisions (such as forklift scratches and cargo falls). Experiments have shown that a 1-meter-wide PU sandwich panel can withstand the impact of a 50kg weight falling freely from a height of 1 meter, far exceeding the impact resistance of ordinary color steel plates. This is particularly important for e-commerce warehouses and logistics transit centers with frequent warehousing. Reducing wall damage is to minimize the risk of goods exposure.
Second protection: Color steel metal sheet
If PU sandwich panels are functional players, color steel metal sheets (represented by color coated steel plates) are basic protection experts. It is made of cold-rolled steel plate as the substrate, and the surface is coated with polyester, epoxy resin and other coatings through baking paint process, becoming the first line of defense of the warehouse with three major characteristics.
Weather resistance and aging resistance: the polyester coating on the surface of color steel plate can resist the erosion of ultraviolet ray, acid rain, salt fog, etc., and its outdoor service life can reach more than 20 years (even longer after being strengthened by PVDF coating). Whether it is the tropical rainstorm in Southeast Asia, the extremely cold wind and snow in Northern Europe, or the salt fog environment in coastal areas, it can keep the surface intact to avoid the corrosion of steel plates and structural weakening caused by coating falling off.
Moisture prevention and leakage prevention: The joints of color steel plates are sealed with interlocking and sealing technology (such as hidden self tapping nails+weather resistant glue), combined with a plate thickness of over 0.5mm, which can effectively block rainwater infiltration. For warehouses in rainy areas such as southern China and tropical rainforests in South America, or for storing goods with strong moisture absorption properties such as paper and cotton, the color steel plate wall will hardly experience the embarrassment of wall peeling and water seepage.
Flexible and easy to maintain: The surface of the color steel plate is smooth and pore free, and only simple wiping is needed to remove dust and oil stains during cleaning. After partial damage, a separate board can be replaced (without the need for overall removal), significantly reducing maintenance costs. This means lower long-term operating costs for high-frequency logistics warehouses and temporary storage facilities (such as emergency material reserves).
Weave a three-dimensional protective net for the warehouse
The combination of PU sandwich panels and color steel metal sheet is essentially a combination of the advantages of the functional layer and the base layer. For example:
Exterior wall: Using color steel metal sheets as the outer layer, utilizing their weather resistance to resist external environmental erosion. The inner composite PU sandwich panel maintains stable temperature and humidity inside the warehouse through thermal insulation.
Roof: PU sandwich panels are directly used as the main body of the roof, which not only reduces the load-bearing capacity of the roof (with a density of only 0.03g/cm ³, equivalent to 1/30 of traditional brick walls), but also protects the roof structure through fire and heat insulation. Color steel plates can be used for edge trimming of roofs to enhance wind resistance, especially in areas with frequent typhoons along the coast.
Partitions and doors and windows: PU sandwich panels are used for internal fire compartments (such as dividing warehouses into raw material areas and finished product areas), and color steel plates are used to make fire doors and ventilation window frames, balancing safety and transparency.
Canglong Group’s Warehouse Solution
In the field of global warehouse construction, Canglong Group has leveraged the advantages of PU sandwich panels and color steel metal sheets to the extreme with 20 years of industry accumulation:
Material customization: Adjust the fire rating of sandwich panels (B1/B2 level optional) and the coating type of color steel plates (polyester/fluorocarbon coating suitable for different climates) according to customer needs, and even add functional masterbatch such as flame retardants and anti-static agents to meet the strict requirements of special industries such as chemical, electronics, and pharmaceuticals.
Fine craftsmanship: Adopting German imported production lines to ensure uniform density of sandwich panel core materials (error<± 2%), and compliance of color steel plate coating thickness (20-50 μ m). Each batch of products has passed third-party testing such as fire resistance, wind resistance, and weather resistance (such as UL certification in the United States and CE certification in the European Union).
Globalization of Engineering: Completed over 500 warehouse projects in Southeast Asia, the Middle East, Europe, and other regions, familiar with local climate characteristics (such as high humidity in Southeast Asia and sandstorms in the Middle East), provided integrated design, production, and installation services, and shortened construction periods by more than 30%.
Conclusion
From moisture-proof and thermal insulation in tropical warehouses to insulation and frost resistance in cold zone warehouses. From fire and explosion prevention in chemical warehouses to constant temperature and humidity in cold chain warehouses. The combination of PU sandwich panel and color steel metal sheet is becoming a safety standard for warehouses worldwide due to its versatile protection and flexible adaptability. Canglong Group with its deep understanding of materials and global engineering experience, enables each warehouse not only to withstand risks but also to maintain efficiency. After all, safeguarding the safety of goods is safeguarding the future of the enterprise.
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