Dry ice is solid carbon dioxide. At room temperature and pressure of 6079.8 kPa, it condenses carbon dioxide into a colorless liquid, and then evaporates rapidly under low pressure to condense into pieces of compacted ice and snow-like solid substances. The temperature is below zero. 78.5°C, this is dry ice. The cold storage capacity of dry ice is more than 1.5 times that of water ice. After absorbing heat, it sublimates into carbon dioxide gas without any residue, non-toxicity, and no peculiar smell. It has a sterilizing effect. It does not liquefy when heated, but sublimates directly. Dry ice is the solid state of carbon dioxide. Since the temperature of dry ice is very low, the temperature is minus 78.5°C, it is often used to keep objects in a frozen or cryogenic state.

At room temperature, when carbon dioxide gas is pressurized to about 101325Pa, when a part of the vapor is cooled to about -56°C, it will freeze into snowflake-like solid carbon dioxide. The heat of vaporization of solid carbon dioxide is very large, which is 364.5J/g at -60°C. When vaporized under normal pressure, the ambient temperature can drop to about -78°C, and no liquid will be produced, so it is called "dry ice". .

Dry ice is widely used, such as mold dry ice cleaning, dry ice making stage effects, dry ice cold chain transportation, etc. Dry ice can also be used as artificial rainfall. It can quickly absorb a large amount of heat when placed in the air to quickly reduce the surrounding temperature and liquefy water vapor. into small water droplets, thus the purpose of rainfall.

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Xiamen Hefengli Dry Ice Decontamination Equipment Co., Ltd., referred to as Hefengli Dry Ice, was established in 1999. It is a professional enterprise dedicated to the application of dry ice in China. It has formed a complete industrial chain of R&D, manufacturing, sales and after-sales. The company's brand is HORECO2, and Hefengli has a doctoral-level R&D team. Its main products include Dry ice granulator & block making machine, Dry ice cleaning machine, dry ice automatic production line, dry ice intelligent cleaning, supply of dry ice of various specifications, dry ice Cleaning service and leasing, Dry ice insulation box, dry ice equipment accessories and related intelligent products; 18 dry ice manufacturing factories have been deployed to provide a complete dry ice distribution service network and provide customers with a cost-effective experience.