Product Name: Cold Storage Interior Insulation Materials

The selection of insulation materials for both the interior and exterior of cold storage buildings is crucial. What are the recommended insulation thicknesses for the inner side of cold storage interior walls, thin-wall construction methods, and fire protection requirements? What are the standards and costs for exterior wall plastic spraying? Senbin Holding (Hubei) Co., Ltd. provides a detailed analysis of compliance standards for cold storage interior wall insulation and exterior building requirements. Specific requirements and specifications are as follows:

Cold storage interior insulation materials are the core of the cold chain warehouse envelope structure, directly determining the thermal insulation performance, moisture resistance, and long-term energy consumption costs of the cold storage. Currently, the mainstream cold storage interior insulation materials on the market are mainly divided into the following categories:

1. Polyurethane (PU/PIR) Insulation Panels

Polyurethane is currently the mainstream insulation material widely used in the cold storage industry with comprehensive performance. It typically adopts a "sandwich" structure, with a high-density rigid polyurethane foam core in the middle, and metal facings such as color-coated steel sheets, stainless steel sheets, or embossed aluminum sheets on both sides. Its thermal conductivity is low (usually between 0.018~0.024 W/(m·K)), with a closed-cell rate of over 95%. It not only provides excellent thermal insulation but also offers superior waterproof and moisture-proof performance, effectively preventing condensation inside the cold storage. Furthermore, high-quality polyurethane materials can achieve a B1-grade flame retardant standard, offering high fire resistance.

2. Polystyrene (EPS/XPS) Insulation Panels

Polystyrene is divided into EPS (expanded polystyrene) and XPS (extruded polystyrene). The advantage of these materials lies in their relatively affordable price and good moisture resistance, making them commonly used in small fresh-keeping warehouses or temporary cold storages with limited budgets. However, their thermal conductivity is relatively higher (0.030~0.035 W/(m·K)), resulting in inferior insulation performance compared to polyurethane. Additionally, their fire resistance is poor (mostly B2 grade), and they are prone to deformation under extreme temperature differences over long-term use. Therefore, they are often used as auxiliary materials or as envelope choices for low-end cold storages.

3. Rock Wool and Glass Wool

Rock wool and glass wool are inorganic insulation materials. Their greatest advantage is excellent fire resistance, capable of meeting the A-grade non-combustible standard, making them highly suitable for pharmaceutical cold storages and chemical explosion-proof cold storages with stringent fire protection requirements. However, these materials have higher thermal conductivity (0.035~0.045 W/(m·K)), resulting in poorer insulation performance. They are also heavy and have high water absorption rates; when used alone, they are prone to moisture absorption leading to insulation failure. Therefore, in practical engineering, they are often combined with materials like polyurethane to balance fire resistance and insulation.

4. Site-Applied Spray Polyurethane Foam

In addition to prefabricated panels, site-applied spraying is also an important process for cold storage insulation. It involves spraying polyurethane foam raw liquid directly onto walls or roofs, which foams and forms instantly. The major advantage of this process is its ability to create a continuous, seamless insulation layer that conforms to various irregular structures, fundamentally eliminating the "thermal bridge effect" caused by panel joint gaps. The overall air tightness and insulation effect are excellent.

In summary, the selection of cold storage insulation materials requires a comprehensive evaluation based on specific temperature zone requirements, fire protection standards, and budget. Among these, polyurethane insulation panels are the absolute mainstream due to their outstanding insulation and moisture resistance; rock wool is a necessity for high-standard fire protection scenarios; and site-applied spraying provides a seamless insulation solution for cold storages with complex structures.