Overview
Dry ice is the solid form of carbon dioxide (CO2), produced by compressing and cooling gaseous CO2. Unlike regular ice, it sublimates (turns directly from solid to gas) at -78.5°C, making it ideal for applications requiring extreme cooling without liquid residue. It is widely used in food preservation, industrial processes, and entertainment (e.g., fog effects). Due to its ultra-low temperature and unique properties, dry ice requires careful handling and specialized storage. It is non-toxic but poses risks such as frostbite and CO2 gas accumulation in confined spaces. B2B buyers should prioritize suppliers with reliable logistics to minimize sublimation losses during transport.
Physical and Chemical Properties
Dry ice is a dense, white solid with a molecular weight of 44.01 g/mol and a density of 1.56 g/cm³ at its sublimation point (-78.5°C). It does not melt into a liquid but transitions directly to CO2 gas, leaving no residue. This property makes it valuable for applications where moisture contamination must be avoided. Its extreme coldness and non-toxic nature are key advantages, though its sublimation rate depends on ambient temperature and insulation. For example, a 10-kg block sublimates completely in 24–36 hours at room temperature. Industrial-grade dry ice often has a purity of 99.9% CO2, with minimal impurities.
Main Applications
In the food industry, dry ice is used to flash-freeze products, transport perishables, and maintain cold chains without refrigeration. It prevents bacterial growth and extends shelf life. For industrial cleaning, dry ice blasting removes contaminants (e.g., grease, paint) without abrasives or solvents. The entertainment industry relies on dry ice for fog effects in concerts and theaters, as it creates a dense, low-lying vapor when mixed with water. Medical and pharmaceutical sectors use it to preserve biological samples and temperature-sensitive drugs during shipping. Other niche uses include shrinking metal parts for assembly and repelling insects in agriculture.
Safety and Storage
Handling dry ice requires insulated gloves and protective eyewear to prevent frostbite. Never store it in airtight containers, as sublimating CO2 can build pressure and cause explosions. Use well-ventilated areas to avoid gas accumulation, which may displace oxygen and cause suffocation. For storage, insulated polystyrene containers or specialized freezers (-80°C) are recommended. Smaller quantities can be kept in coolers with minimal airspace to slow sublimation. Always label containers clearly and train staff on emergency procedures for CO2 exposure, such as moving to fresh air immediately.
B2B Procurement Guide
When sourcing dry ice, verify supplier certifications (e.g., FDA compliance for food-grade use) and production methods. Liquid CO2 feedstock should be high-purity to avoid contamination. Confirm delivery schedules and packaging—pelletized dry ice is easier to handle than blocks for some applications. Negotiate pricing based on volume; bulk orders (e.g., 100+ kg) often reduce costs by 20–30%. Evaluate logistics: proximity to suppliers minimizes sublimation losses, and overnight shipping may be necessary for distant buyers. For recurring needs, consider on-site dry ice production machines, which compress CO2 gas into solid form, reducing dependency on external suppliers.
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