Controlled Atmosphere (CA) Gas-Tight Storage Panels
Special insulated panels for controlled atmosphere (CA) storage are the key enclosure materials for building CA warehouses. Compared to regular cold storage panels, they not only need excellent thermal insulation, but the most critical requirement is top-
Controlled Atmosphere (CA) Gas-Tight Storage Panels
Main features
Special insulation panels for controlled-atmosphere warehouses are the most essential enclosure materials when building a CA (controlled-atmosphere) storage. Compared to regular cold storage panels, they not only need top-notch thermal insulation, but the key requirement is super airtightness (to prevent gas leakage) to ensure accurate control of oxygen, carbon dioxide, and ethylene levels inside the storage.
Right now, the most popular and high-performing option in the industry is the polyurethane (PU/PIR) double-sided metal composite sandwich panel.
| Core Material | PIR (Polyisocyanurate) or PUR (Polyurethane) | PIR offers better thermal stability and achieves the higher B1 fire rating more easily. |
| External Metal Panels | Double-sided color steel plate, 304 stainless steel plate, anti-slip embossed aluminum plate | · For high hygiene standard food and pharmaceutical warehouses: stainless steel plate is preferred. · For insulated flooring or anti-slip requirements: embossed aluminum plate is recommended. · For conventional fruit and vegetable controlled-atmosphere warehouses: high-quality color steel plate with a thickness of no less than 0.4~0.6mm. |
| Panel Thickness | 100mm / 120mm / 150mm / 200mm | · Fruit and vegetable storage warehouse around 0°C: 100mm or 120mm. · Low-temperature warehouse/freeze storage at -18°C and below: 150mm to 200mm. |
| Width and Length | Effective width is generally 960mm, 1000mm, or 1150mm | Length can be custom-produced continuously according to the height of the warehouse, generally up to 14~15 meters. |
Ultimate Airtightness:
Controlled-atmosphere storage rooms require an extremely low air exchange rate (usually the standard is air exchange rate ≤ 0.5 vol/day).
The joints of insulation panels usually use a tongue-and-groove structure or internal eccentric hook-lock. After assembly, multiple layers of sealing with dedicated controlled-atmosphere sealant, sealing tape, or butyl strips are necessary to completely prevent gas leakage.
High Closed-Cell Rate and Very Low Thermal Conductivity: High-quality rigid polyurethane foam has fine pores, a closed-cell rate ≥ 90%, and a thermal conductivity as low as 0.023~0.024 W(m·K), achieving optimal insulation and energy-saving effects even with very thin panels.
High Compressive Strength and Durability: Since controlled-atmosphere rooms create slight pressure differences inside and outside due to gas composition adjustments, the panels need to have high load-bearing capacity and high compressive strength (usually ≥ 250 kPa), and be frost-resistant, moisture-proof, mold-proof, and long-lasting without deformation.
Fire Protection: Must meet national standards for B1 or B2 flame retardant levels.
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