What Is Dry Ice?
The blasting agent which consists of dry ice is the solid form of CO2 ( carbon dioxide) at a temperature of - 78.5°C. CO2 is a natural medium, which has an inherent thermal energy ready to be tapped. At atmospheric pressure, solid CO2 sublimates directly to vapour without a liquid phase. This unique property means that the dry ice blast medium simply disappears, leaving only the original contaminant to be disposed of. In addition, cleaning in water sensitive areas (e.g. in the proximity of electrical cabinets) is now possible.
The grade of carbon dioxide used in blasting is the same as that used in the food and beverage industry and has been specifically approved by the FDA, the EPA and the USDA. The carbon dioxide is an odourless, non-toxic gas which is used in the drinks industry as an additive in beer and mineral water. It is also used in the food industry for cooling meat and sausage etc.
Carbon dioxide is a non-poisonous, liquefied gas that is both inexpensive and easily stored at work sites. Of equal importance, it is non-conductive and non-flammable. CO2 is a natural by-product of several industrial manufacturing processes such as fermentation and petrochemical refining. The CO2 given off by the above production processes is captured and stored without losses until needed. When the CO2 is returned to the atmosphere during the blasting process, no new CO2 is produced. Instead, only the original CO2 by-product is released.
How is dry ice produced?
A regular supply of Liquid Carbon dioxide from a storage tank is expanded at low pressure and form the dry ice snow (at a temperature of –78,.5°C ) which is then pressed through a die by a single acting horizontal piston producing dry ice pellets in different dimension. For the successful operation of the dry ice machine it is essential to use moisture – free Liquid CO2.