Polyurethane cold storage panels (hand-made type / hook-type) are rigid polyurethane insulation panels specially designed for cold storage, produced via the hand-molded compression molding process and equipped with an eccentric quick hook connection structure. They serve as the core main material for modular cold storage construction. The product uses closed-cell rigid polyurethane foam as the insulation core, with metal panels of different materials and thicknesses laminated on both sides, combining excellent thermal insulation, fire resistance, structural load-bearing capacity, corrosion resistance and weather resistance. It can adapt to non-standard sizes and various working conditions for cold storage construction, and is currently the most widely used insulation panel product in industrial and commercial cold storage projects. The product’s panel material and thickness specifications cover all scenario requirements, and can be flexibly selected according to working conditions, corrosion resistance levels and budget costs. The specific optional specifications are as follows: Double-sided color-coated steel plate series, with optional panel thicknesses of 0.326mm, 0.376mm, 0.426mm, 0.476mm and 0.5mm; Single-sided stainless steel plate series, with optional panel thicknesses of 0.4mm and 0.5mm; Double-sided stainless steel plate series, with optional panel thicknesses of 0.4mm and 0.5mm; Single-sided embossed aluminum plate series, with a fixed panel thickness of 1.8mm. The core material is rigid closed-cell polyurethane foam, with a standard density controlled at 38kg/m³ - 42kg/m³. Conventional panel thickness options are 50mm, 75mm, 100mm, 150mm and 200mm, with a standard width of 1000mm per panel and a maximum custom length of up to 12000mm, fully meeting the non-standard size requirements for cold storage construction. The core performance of the product complies with current national standards, with clear technical indicators and stable, controllable performance. In terms of fire performance, the product reaches the B2 flame-retardant standard, meeting the requirements of GB 8624-2012 *Classification for Burning Performance of Building Materials and Products*. It self-extinguishes upon contact with fire and has no molten dripping, meeting the fire safety specifications for cold storage projects. In terms of thermal insulation performance, the core material has a thermal conductivity ≤0.022W/(m·K) (tested at an average temperature of 25°C) and a closed-cell rate ≥95%, which can effectively block heat conduction and significantly reduce cold storage operation energy consumption. In terms of structural mechanical performance, the panel has a compressive strength ≥200kPa, flexural strength ≥150kPa and single-point hanging force ≥1000N, meeting the load-bearing requirements for equipment installation and personnel movement in cold storage. In terms of weather resistance and stability, the panel has a volumetric water absorption rate ≤3% (tested by volumetric method), with a service temperature range of -60°C to +120°C, adapting to all working conditions from ultra-low temperature quick-freezing cold storage to high-temperature fresh-keeping cold storage. Under normal working conditions, the service life of the panel can exceed 15 years. In terms of dimensional accuracy, the finished panel has a length deviation ≤±2mm, width deviation ≤±1mm, thickness deviation ≤±0.5mm and panel flatness error ≤0.2mm/m, ensuring the tightness and installation accuracy of on-site splicing. The product adopts an integral pre-embedded eccentric quick hook connection structure, with hooks made of high-zinc galvanized corrosion-resistant steel. The spacing between pre-embedded hooks per panel is ≤500mm, and the self-locking splicing tensile force per set of hooks is ≥15kN, enabling quick splicing and firm locking between panels. The installation process requires no on-site secondary processing, additional riveting or welding procedures, and a single person can complete the installation of one panel, with a standard installation time per panel ≤5 minutes. Compared with traditional flat-mouth and riveted cold storage panels, on-site construction efficiency is improved by over 60%, significantly shortening the cold storage construction period. After splicing, the joint gap between panels is ≤0.5mm, and double EPDM low-temperature resistant sealing strips are matched at the joints, with an overall air permeability ≤0.01%, completely preventing cold leakage from the storage and external hot air infiltration, while effectively avoiding cold bridge condensation at the splicing joints and ensuring long-term stability of the overall insulation performance of the cold storage. Products with different panel specifications can accurately meet the core needs of different application scenarios, and the characteristics of each series are as follows. The double-sided color-coated steel plate series uses high-zinc double-sided color-coated steel plates with a zinc coating weight ≥80g/㎡, featuring strong top coat adhesion, scratch resistance, UV resistance and good weather resistance, with outstanding cost performance. It is the preferred main material for conventional general-purpose cold storage such as fruit and vegetable fresh-keeping cold storage, meat freezing cold storage and cold chain warehousing cold storage. The single-sided stainless steel plate series uses food-grade 304 stainless steel panels on the inner side of the storage and high-quality color-coated steel plates on the outer side, combining food hygiene safety and cost controllability. The panel is smooth without dead corners, corrosion-resistant and easy to clean and disinfect, fully meeting the requirements of GB 14881-2013 *General Hygienic Specifications for Food Production*, and adapting to scenarios with clear hygiene requirements in the storage such as central kitchens, food processing workshops and fresh food distribution centers. The double-sided stainless steel plate series uses food-grade 304 stainless steel panels on both sides, with full-panel corrosion resistance, mold resistance, antibacterial properties and no harmful substance precipitation, adapting to high-humidity, high-salt and high-corrosion environments, and meeting high hygiene and corrosion resistance requirements in scenarios such as pharmaceutical cold chain cold storage, aquatic product processing cold storage, clean vegetable processing workshops and chemical raw material storage warehouses. The single-sided embossed aluminum plate series uses 1.8mm anti-slip embossed aluminum plates on the inner side of the storage and high-quality color-coated steel plates on the outer side. The aluminum plate has uniform thermal conductivity, strong low-temperature brittleness resistance, rust and corrosion resistance, and is not easy to frost, adapting to special working conditions such as ultra-low temperature quick-freezing cold storage below -35°C, aquatic product low-temperature freezing cold storage and chemical raw material low-temperature storage cold storage. The product adopts the hand-molded compression molding process, which has higher customization than continuous machine-made panels, adapting to non-standard requirements such as corners, door openings and special-shaped sizes. The panel has no wave deformation, higher flatness and better splicing accuracy of panel edges. All products undergo full performance testing before leaving the factory, including dimensional accuracy testing, air tightness testing, core material density testing and fire performance sampling inspection, ensuring each panel meets design standards and usage requirements. The product has core advantages of thermal insulation and energy saving, quick installation, firm structure, corrosion resistance and weather resistance, and flexible customization, perfectly matching the construction needs of various fixed-splicing cold storage, dual-temperature cold storage and post-built commercial cold storage. The product is widely used in various industrial and commercial cold storage projects such as fruit and vegetable fresh-keeping cold storage, meat freezing cold storage, aquatic product quick-freezing cold storage, stainless steel dual-temperature cold storage, post-built commercial cold storage, food processing cold storage, pharmaceutical cold chain cold storage, central kitchen cold storage and cold chain logistics warehousing cold storage, adapting to all scenario cold storage construction needs in different temperature ranges and usage environments.