Should boric acid crystal and/or debris be detected, Jamko employs proven non-destructive cleaning methods. Carbon Dioxide (CO2) cleaning, or rather “dry ice” cleaning, is an effective way to clean and rehabilitate bare metal surfaces without lengthy and costly disassembly operations. Used properly, dry ice cleaning can provide a safe method of removing surface contaminants without harming the base metal surface.
Since dry ice pellets vaporize on contact, the dry ice blasting process does not generate additional secondary contaminated waste. All that remains to be collected is the contaminant material being removed.
Abrasive vs. Non-Abrasive Cleaning
Bare metal surfaces and penetrations can be cleaned without compromising the structural integrity of bare metal due to the CO2 dry ice pellet’s non-abrasive nature.
CO2 Cleaning Process
Dry ice blast cleaning is a process in which particles of solid carbon dioxide, commonly known as dry ice, are propelled at high velocity to impact and clean a surface. Upon impact, the CO2 particles return to their natural state as carbon dioxide gas, thus disappearing as they clean. Although it is often compared to sand blasting, bead blasting, or soda blasting, dry ice actually clean differently. Traditional abrasive blasting methods clean through a chiseling action, much like using an ice pick, but often take away part of the substrate as well. Dry ice, on the other hand, might better be compared to a spatula as it lifts away the contaminant without damaging the targeted surface.
Energy Transfer - With dry ice blasting, dry ice pellets are propelled out of the blasting gun at supersonic speed and impact the surface. The energy transfer knocks off the contaminant without abrasion. The force of this impact is the primary means of cleaning.
Micro-Thermal Shock - The cold temperature during dry ice blasting of the dry ice pellets hitting the contaminant creates a micro-thermal shock (caused by the dry ice temperature of -79º C) between the surface contaminant and the substrate. Cracking and delaminating of the contaminant occurs furthering the elimination process.
Gas Pressure - The final phase of dry ice blasting has the dry ice pellet explode on impact, and as the pellet warms it converts to a harmless CO2 gas which expands rapidly underneath the contaminant surface. This forces off the contaminant from behind. The contaminant is then relocated, typically falling to the ground. Since the dry ice evaporates, only the contaminant is left for disposal.