In addition to our other blast cleaning methods using Soda and Glass bead we also offer Dry Ice Blasting. We can offer Dry Ice Blasting as an alternative to Soda Blasting for projects where dust and post blast clean-up are issues.
Dry-ice blasting involves propelling pellets at extremely high speeds. The actual dry-ice pellets are quite soft, and much less dense than other media used in blast-cleaning (i.e. sand or plastic pellets). Upon impact, the pellet sublimates almost immediately, transferring minimal kinetic energy to the surface on impact and producing minimal abrasion. The sublimation process absorbs a large volume of heat from the surface, producing sheer stresses due to thermal shock. This improves cleaning as the top layer of dirt or contaminant is expected to transfer more heat than the underlying substrate and flake off more easily. The efficiency and effectiveness of this process depends on the thermal conductivity of the substrate and contaminant. The rapid change in state from solid to gas also causes microscopic shock waves which also assist in removing the contaminant.
Dry Ice Blasting is particularly good when removing bituminous coatings for applications such as beam cleaning and removing underseal form motor vehicles. The bitumen is render fragile by the super cooling blasting and the shock causes it to separate from the substrate.
Dry ice Blasting has many applications in the food industry, mold cleaning, print press cleaning and cleaning electric motors and machine tools. Though a more expensive process than most other forms of blast cleaning the lack of need to disassemble and rebuild complicated tools means the time savings can be considerable, both in labour and down time. Dry Ice Blasting is also favoured over solvents in aerospace applications and where a minimal post blast waste is desired.