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Dry ice cleaning principle

When spraying out dry ice pellet (3mm) with over 2mohs of hardness at over 5 bars of air input, it impacts on foreign substance at approx >>300∼800m/s of speed, generating heat impact due to difference of temperature between cleaning target and pellet.

After that, difference of coefficient of thermal expansion between inter-metallic compounds and the foreign substance makes them repeatedly contract and expand, creating crack.

Dry ice getting into the crack expand 800 times larger and peel off foreign substance from the target.
The compressed air removes foreign substance without any humidity.

Safety

Regarding stress, deformation rate and surface abrasion caused when spraying dry ice (Hardness:2 mohs, Temp.-78.5 C) to cleaning target
>> the drastic difference of temperature with target is limited to surface (20∼50mm) only and instantaneous heat impact cannot cause deformation or abrasion since it is insignificant compared to heat treatment process of metallic and non-metallic materials.
(For example, when skin is exposed to dry ice for short time, it causes low temperature burn other than frostbite)

Cost saving

Reduce down time >> Dry ice cleaning is highly cost effective as it does not require dismantlement, assembly, and post processing of cleaning target

Reduce cost to process hazardous waste >> It does not make any hazardous waste which is normally caused when using organic solvent

Reduce maintenance cost >> Rapid cleaning saves cost for management and maintenance.

Reduce abrasion of equipment >> Dry ice cleaning helps increase life span of equipment by cleaning the target without surface abrasion.

Comparision with other cleaning methods

Comparision with other cleaning methods
cleaning method Surface abrasion Toxicity The secondary waste Electrically conductive Effectiveness
Sand blasting NO NO YES NO OK
Dry Ice Blasting NO NO NO NO EXELLENT
Soda Blasting NO NO YES NO OK
Steam Blasting NO NO NO YES EXELLENT
Water Blasting YES YES YES YES OK
Solvents/Chemicals YES YES YES YES LIMITED
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