Overview
Solid block dry ice is the solid state of carbon dioxide (CO2), produced by compressing and cooling gaseous CO2 to -78.5°C. Unlike regular ice, it sublimates directly from solid to gas, leaving no residue. Its extreme cold temperature and cleanliness make it indispensable in industries requiring rapid or contactless cooling. First commercialized in the 1920s, dry ice gained prominence for railroad refrigeration and later expanded to food processing, pharmaceuticals, and entertainment. Its non-toxic nature and lack of electrical conductivity further broaden its utility in sensitive environments like laboratories and electronics manufacturing.
Physical and Chemical Properties
Solid block dry ice maintains a surface temperature of -78.5°C, with a density of 1.56 g/cm³. Its sublimation rate depends on ambient conditions but typically loses 5–10% of mass per day in standard insulated containers. The blocks are odorless and non-flammable but can displace oxygen in confined spaces. Under pressure, dry ice can be compacted into pellets or slices for specialized uses. Its high thermal conductivity (0.35 W/m·K) ensures efficient heat transfer, though handling requires caution due to frostbite risks. Unlike water ice, it does not form slippery surfaces upon sublimation.
Main Applications
In food logistics, dry ice preserves perishables like seafood and vaccines during transit, complying with FDA and WHO cold-chain standards. Industrial uses include shrink-fitting metal parts and cleaning machinery via dry ice blasting, which removes contaminants without abrasives. The entertainment sector employs dry ice for fog effects in concerts and theaters, leveraging its rapid sublimation when mixed with hot water. Medical applications include cryotherapy and specimen preservation. Emerging uses include carbon capture experiments and as a propellant in aerospace testing.
Safety and Storage
Always store dry ice in ventilated, insulated containers like polystyrene boxes to slow sublimation. Never seal containers airtight—CO2 gas buildup can cause explosions. Use in well-ventilated areas to prevent oxygen depletion, which may lead to asphyxiation. Personal protective equipment (PPE) like cryogenic gloves and goggles is mandatory during handling. Transport requires DOT-approved packaging labeled "UN 1845." Dispose of unused dry ice by letting it sublimate in open air; never dump in sinks or trash compactors.
B2B Procurement Guide
Bulk buyers should assess suppliers based on production capacity (e.g., tons/day), delivery frequency, and cold-chain reliability. Opt for manufacturers using food-grade CO2 to avoid impurities. Request Certificates of Analysis (CoA) for purity verification. Pricing often scales with order volume and logistical distance. Negotiate contracts with clauses for sublimation loss compensation. For international shipments, verify compliance with IATA and IMDG regulations. Modular storage solutions like walk-in freezers can reduce waste for high-volume users.
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