Overview
Solid carbon dioxide, or dry ice, is a versatile industrial and commercial product derived from pressurized and cooled CO2 gas. Unlike regular ice, it transitions directly from solid to gas (sublimation) without leaving liquid residue, making it invaluable for applications requiring contamination-free cooling. First commercialized in the 1920s, dry ice is now widely used in food processing, pharmaceuticals, and logistics. Its extreme cold (-78.5°C) and ease of handling have cemented its role in temperature-sensitive transport and cleaning processes.
Physical and Chemical Properties
Dry ice exhibits unique properties due to its sublimation point and molecular structure. At standard pressure, it bypasses the liquid phase entirely, releasing CO2 gas. This property makes it ideal for cooling without moisture, critical in electronics or medical applications. Its density (1.56 g/cm³) and opacity differ markedly from gaseous CO2. Though chemically inert, prolonged exposure to moisture can form mild carbonic acid, requiring corrosion-resistant storage for certain uses.
Main Applications
The primary use of dry ice is as a refrigerant for perishable goods, including food and vaccines, during transport. Its ultra-low temperature extends shelf life without mechanical refrigeration. In industrial settings, dry ice blasting cleans machinery by combining kinetic energy and thermal shock, removing contaminants without abrasives. The entertainment industry employs it for fog effects due to its dense, low-lying gas clouds.
Safety and Storage
Handling dry ice requires precautions due to its extreme cold and asphyxiation risks. Insulated gloves and tools are mandatory to prevent frostbite, and storage areas must be well-ventilated to avoid CO2 gas accumulation. For long-term storage, specialized containers with minimal heat transfer are recommended. Never seal dry ice in airtight vessels, as sublimation can cause pressure buildup and explosions.
B2B Procurement Guide
When sourcing dry ice, prioritize suppliers with reliable logistics to minimize sublimation losses during transit. Verify pellet or block forms match your application—small pellets suit short-term cooling, while blocks last longer. Request certificates of analysis for purity, especially for food-grade or medical uses. Bulk buyers should negotiate contracts with frequent deliveries to ensure freshness, as dry ice typically loses 5–10% of mass daily.
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