Overview
Pelletized dry ice is manufactured by compressing liquid CO2 into small cylindrical or spherical forms, offering higher surface-area-to-volume ratios than block dry ice. This shape facilitates precise dosing and efficient cooling in transportation and industrial processes. Unlike traditional refrigerants, it transitions directly from solid to gas (sublimation), eliminating liquid runoff. The food industry accounts for approximately 60% of global pelletized dry ice consumption, followed by pharmaceutical logistics and specialty applications like theater fog effects. Its ultra-low temperature and bacteriostatic properties make it indispensable for perishable supply chains.
Physical and Chemical Properties
With a sublimation point of -78.5°C, pelletized dry ice maintains temperatures far below conventional refrigeration. Its cooling capacity is 2.5 times that of water ice by weight. The pellets exhibit minimal thermal conductivity (0.016–0.024 W/m·K), allowing gradual heat absorption. Under pressure, dry ice can form a liquid phase at temperatures above -56.6°C, though this requires specialized equipment. Industrial pellets typically have 99.9% CO2 purity, with trace impurities like oil (≤5 ppm) from manufacturing compressors.
Main Applications
In cold chain logistics, 3–10 mm pellets maintain seafood, vaccines, or biologics at -60°C or below during transit. The aviation industry uses them for galley cooling, while food processors employ pellets for quick chilling of dough or meat products. Dry ice blasting utilizes 3 mm pellets for non-abrasive surface cleaning in印刷 or mold remediation. Emerging applications include temporary cryotherapy and cloud seeding. Unlike gel packs, it doesn't require return logistics, reducing operational costs.
Safety and Storage
Proper handling requires insulated gloves and eye protection due to extreme cold. Storage containers must allow gas venting—sealed units risk pressure buildup from sublimated CO2. OSHA recommends limiting workplace exposure to 5,000 ppm (8-hour TWA). For transport, UN1845 Class 9 labeling is mandatory. Industrial users should monitor enclosed spaces with CO2 detectors, as concentrations above 10% can cause asphyxiation. Pellets lose 5–10% mass daily even in quality insulated boxes.
B2B Procurement Guide
Bulk buyers should verify pellet size consistency (±1 mm tolerance) and sublimation rate certifications. Just-in-time delivery is critical—most suppliers guarantee production within 12h of shipment. Food-grade pellets require NSF/ISO 22000 certification. Regional availability varies—coastal plants often offer better pricing due to proximity to CO2 sources like ammonia production facilities. Negotiate contracts based on annual volume, with tiered pricing for orders above 5 metric tons/month. Consider on-site pelletizers for daily needs exceeding 500 kg.
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