How It Works
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Kinetic Energy - Thermal Differentials - Reverse Fracturing

Kinetic Energy is the momentum part.  It is the energy associated with mass & velocity being transfer to a surface being cleaned.
Thermal Differentials is established between the surface coating and the substrate as the cold dry ice pellet (mic rice) impacts with the surface.
Reverse Fracturing is when the CO2 gas invades the cracks and pores to get under the contaminant / coating.  As the CO2 warms, it causes rapid expansion and pushed the contaminant / coating away from the substrate.  The contaminant then falls to the ground and can be collected and disposed of.