Dry Ice Blasting Safety: PPE, CO₂ Exposure, and Site Controls
Dry ice blasting is safe when three hazards are controlled: cold contact, high-velocity media, and CO₂ accumulation. Here is the practical safety plan crews should follow on every job.
Dry ice blasting removes the two biggest hazards of traditional blasting — silica dust and pressurized water — but it introduces three of its own: cryogenic contact at −109 °F, a high-velocity media stream, and carbon dioxide gas that displaces oxygen in low or enclosed spaces. All three are well understood and fully controllable with standard industrial practice.
Required PPE
- Insulated, cryogenic-rated gloves for handling pellets and hoppers
- Full-face shield or sealed safety goggles — the stream ricochets contaminant
- Hearing protection rated for 100–125 dB; double protection in enclosures
- Long sleeves and closed footwear; no exposed skin in the blast path
- Respiratory protection matched to the contaminant, not to the dry ice
CO₂ exposure limits worth memorizing
Ambient air is about 400 ppm CO₂. OSHA's permissible exposure limit is 5,000 ppm as an 8-hour TWA, with a 30,000 ppm short-term ceiling in most jurisdictions. Because CO₂ is heavier than air, it collects in pits, tanks, trenches, basements, and vessel bottoms — exactly where crews kneel.
- Use a calibrated CO₂ monitor in every enclosed or below-grade work area
- Provide forced ventilation with exhaust drawn from the low point
- Set audible alarms at 5,000 ppm and evacuate at 15,000 ppm
- Never blast in an unventilated space with a single point of egress
Electrical work rules
Dry ice is non-conductive, which is why the method is used on switchgear and motor windings. That does not make energized work automatically safe. Follow NFPA 70E, use arc-rated clothing where the task requires it, and confirm with the plant electrician whether the equipment can stay energized or must be de-energized and locked out.
Storage and handling
Store pellets in vented insulated containers only — never in a sealed cooler or a closed vehicle cab. Sublimation pressure will rupture a sealed container. Plan pellet deliveries against sublimation loss of roughly 2–10 percent per day depending on container quality.
Frequently Asked Questions
Is dry ice blasting dangerous?+
Not when the standard controls are used. The real risks are CO₂ accumulation in enclosed spaces, noise, and cryogenic contact — all managed with monitoring, ventilation, hearing protection, and insulated gloves.
Does dry ice blasting create silica dust?+
No. The media sublimates to gas, so there is no blasting dust. Dust from the contaminant itself can still require respiratory protection and containment.
How loud is dry ice blasting?+
Typically 100–125 dB at the nozzle. Hearing protection is mandatory, and some machines offer noise-reducing nozzles that cut several decibels.
Can it be used in a confined space?+
Yes, with a confined-space permit, continuous CO₂ monitoring, forced ventilation exhausting from the low point, and an attendant outside the space.
Have a space you are unsure about? talk to our team and we will walk the ventilation plan with you before we quote.
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