Kryoblast - Knowledge , BlogsKryoblast - Knowledge , Blogshttps://www.kryoblast.com/knowledge/blogsSun, 11 Oct 2026 11:29:04 +0530http://zoho.com/sites/<![CDATA[Dry Ice Blasting: The Complete Guide]]>https://www.kryoblast.com/knowledge/post/dry-ice-blasting-complete-guide
Kryoblast Knowledge · Complete guide

Dry ice blasting, explained from pellet to plant floor

The physics, the machines, the settings, the safety rules, where it works and where it doesn't, with links to the research behind it.

14 chapters15 research sources3 interactive tools~25 min read
CHAPTER 01

Dry ice 101

Dry ice is carbon dioxide (CO₂) in solid form. At normal atmospheric pressure it cannot exist as a liquid: it goes straight from solid to gas, a change called sublimation, at −78.5 °C.

That one property is why it cleans so well. A pellet hits a surface, does its work and vanishes as gas. There is no water to dry, no grit to sweep up and no chemical to dispose of. What's left is only the dirt that was removed.

Dry ice is also soft compared with steel, aluminium, chrome or most coatings, so it can strip contamination without cutting into the base material the way sand or grit does.

Close-up of dry ice pellets
−78.5 °CSublimation point at 1 atm (−109.3 °F)
~800×Volume increase from solid to gas (≈1.56 g/cm³ solid vs ≈1.98 g/L gas)
0Liquid phase at normal pressure: it never melts or wets
0Secondary blast media left behind
CHAPTER 02

How dry ice pellets are made

Pellet quality is half the cleaning result. Fresh, dense pellets of the right size hit harder and last longer in the hopper.

CO₂ is captured

Most industrial CO₂ is recovered as a by-product of other processes such as ammonia production, fermentation and refining.

Stored as liquid

It is purified and kept as a pressurised, refrigerated liquid in insulated tanks.

Flashed to snow

Releasing the liquid to atmospheric pressure makes part of it flash into gas and part freeze into CO₂ snow.

Pressed through a die

A pelletizer compresses the snow and extrudes it through a die plate into dense rods, cut into pellets.

Sized for the job

3 mm pellets for heavy deposits; 1.5 mm or shaved micro-particles for delicate surfaces and fine detail.

Dry ice block and dry ice pellets

Why fresh pellets matter

Pellets keep subliming while they are stored, even in an insulated box. Over a few days they shrink, round off and stick together. Older ice gives weaker impact and inconsistent feeding.

That's why Kryoblast makes its own pellets on the HT-GB30 pelletizer: the ice reaches your machine fresh, at the right size, when your shutdown needs it.

CHAPTER 03

The physics: three effects at once

Press play, or step through each effect. Each stage below is what happens in roughly a few milliseconds at the surface.

Pick a stage, or press Play to watch a pellet clean a contaminated surface.

Impact of dry ice pellets

Kinetic impact

Compressed air accelerates pellets to high speed. On impact they transfer energy into the contaminant layer and start breaking its bond with the surface.

Frozen contamination

Thermal shock

At −78.5 °C the contaminant cools and turns brittle. It also shrinks at a different rate from the metal below it, which opens micro-cracks along the bond line.

Expansion of sublimating dry ice

Sublimation lift

Pellet fragments that get into those cracks turn to gas almost instantly, expanding hundreds of times in volume and pushing the loosened layer off from underneath.

Why it suits some dirt better than others. Brittle or loosely bonded deposits (release agents, carbon, soot, paint overspray, dust, light rubber residue) respond best. Thick, greasy or deeply baked layers absorb impact and resist thermal shock, so they need more passes or another method. Research has also combined dry ice with laser heating to boost the thermal effect on tough coatings (Uhlmann et al., 2006, see the research library).
CHAPTER 04

Inside a dry ice blasting machine

Every blaster does the same basic job: meter pellets out of a hopper into a stream of compressed air and deliver them through a hose to a nozzle. The differences are in how evenly they feed, how much air they need and how well they handle cold and moisture.

Single-hose machines push pellets and air together through one hose for maximum impact. Two-hose (venturi) designs carry ice and air separately and mix them at the gun; they are simpler but usually less powerful.

Kryoblast VTX200E dry ice blasting machine

Hopper

Insulated container for pellets. Often vibrated or agitated so ice doesn't bridge and stop flowing.

Feeder

A rotor or airlock that meters a steady dose of pellets into the airstream. Feed rate sets ice consumption.

Pressure regulator

Sets blast pressure. Higher pressure means more aggression, more noise and more air; lower pressure is gentler.

Blast hose

Insulated, static-dissipative hose. Long or kinked hoses waste pressure and can let pellets sublime before they reach the nozzle.

Gun and trigger

Ergonomic gun with a dead-man trigger. Remote triggers start and stop air and ice together.

Nozzles

Flat fan for wide surfaces, round for spot work, angled and extension nozzles for vents, cavities and behind fixtures.

Compressed air

The real power source. It must be dry and oil-free: moisture freezes in the cold hose and causes blockages.

Ice shaver (optional)

Some machines shave block ice into fine particles for delicate cleaning; one study found a pneumatic shaver drive used about 19% of the machine's air (Máša et al., 2014).

CHAPTER 05

The settings that matter

Move the controls to see how each setting trades cleaning power against gentleness, noise and running cost.

Cleaning power
Gentleness on the surface
Noise
Dry ice used
Compressed air demand

Indicative trends to explain the trade-offs, not specifications for any machine. Real settings depend on the contaminant, the surface and your compressor.

What the research says about pressure. In a study on tyre-mould cleaning, dropping blast pressure from 8 bar to 2 bar cut energy use and noise, but cleaning efficiency fell to about 25%. Purpose-built silencers reduced sound by roughly 9–10 dB(A) without changing pressure (Muckenhaupt et al., 2019). Faster isn't always better either: slower traverse speeds and repeat passes cleaned more thoroughly, at the cost of cooling the part more (Uhlmann et al., 2025).
CHAPTER 06

Dry ice versus other cleaning methods

MethodWaste left behindAbrasiveNear electricalsDismantlingDrying timeBest for
Dry ice blastingOnly the removed dirtNoSuitableUsually notNoneIn-place cleaning of moulds, motors, lines
Sand / grit blastingSpent media + dirtYesNoOftenNoneRust and paint stripping on robust steel
Soda blastingSoda residue + dirtMildLimitedOftenRinse neededPaint and grease on less delicate parts
Pressure washingContaminated waterNoNoOftenHoursFloors, exteriors, robust equipment
Chemical solventsChemical wasteNoDependsUsuallyEvaporationGrease and oils on small parts
Manual scrapingDirtRisk of scratchesSlowOftenNoneSmall, occasional jobs
Laser cleaningFumes, dirtNoPossibleSometimesNonePrecision de-coating; high equipment cost

Electric utilities surveyed by EPRI reported CO₂ blasting took roughly 20% of the time of steam cleaning on electrical equipment, largely because no drying was needed (EPRI, 2002).

CHAPTER 07

Where dry ice blasting works

Industries and the jobs dry ice handles best, with evidence where published research exists.

Plastics and injection moulding

Release agent and gas build-up in moulds and vents, cleaned hot and in the press. Less downtime, fewer rejects.

Rubber and tyre moulds

Vulcanisation residue in vents and textures without damaging engraving. A major research topic for pressure and noise optimisation.

Study: Muckenhaupt et al. 2019 →

Food and beverage

Conveyors, ovens, mixers and packaging lines cleaned dry. Removes bacteria comparably to conventional cleaning, but is not a disinfection step on its own.

Study: Witte et al. 2017 →

Power and electrical

Motors, generators, switchgear and transformers cleaned in place, reducing outage time.

Report: EPRI 2002 →

Automotive manufacturing

Paint-shop fixtures and skids, weld lines, robots and body tooling.

Aerospace and defence

Paint and sealant removal from aluminium panels; studied as a replacement for plastic media blasting.

Studies: ORNL 1995, US Navy →

Foundry and die-casting

Sand, binder and carbon deposits on core boxes, dies and tooling.

Printing and packaging

Ink and paper dust on rollers, presses and gluing units without solvents or water.

Fire and smoke restoration

Soot and char removed from structures and machinery after fires, with no water damage.

Facility management and HVAC

Kitchens, exhausts, coils and building services where water and chemicals are a problem.

Vehicle detailing

Engine bays, underbodies and interiors cleaned dry.

Heritage and conservation

Careful, low-pressure cleaning of soot or coatings on historic surfaces, tested case by case.

CHAPTER 08

What dry ice can't do (honestly)

Knowing the limits saves a wasted trial. These come from published studies and user surveys.

It is not a disinfectant

In dairy-equipment tests, bacterial reduction was under 5 log units, so the authors advise against using it as a disinfection step, and recommend blasting away from production areas to avoid spreading bacteria (Witte et al., 2017).

Line of sight only

The jet must reach the surface. Hidden cavities need angled or extension nozzles, or partial dismantling (EPRI, 2002).

Greasy and baked-on layers

Heavy grease and baked epoxies were among the deposits utilities found hard to remove (EPRI, 2002).

Too aggressive can damage

Pellets that are too large or pressure that is too high can harm soft insulation or delicate parts. Start gentle and step up.

It cools the part

Repeated passes lower the substrate temperature, which matters for adhesives, solder joints and electronics (Uhlmann et al., 2025).

It is loud and needs air

Blasting is noisy and needs a large, dry compressed-air supply. Plan compressor capacity before buying.

CHAPTER 09

Safety checklist

Dry ice blasting is safe when done right, but CO₂, cold and noise are real hazards. Tick through the list before every job.

~420 ppmCO₂ in normal outdoor air
5,000 ppmOSHA 8-hour workplace limit
40,000 ppmNIOSH immediately dangerous level

0 of 8 checked

CHAPTER 10

The environmental case

No secondary waste

The blast media disappears. The US Navy cited disposing of more than 100,000 lb of contaminated media a year at one facility when it explored switching to dry ice (NAVFAC NESDI 590).

No wastewater

Nothing to treat or drain, and no water damage to electrics or buildings.

No solvents

Removes solvent purchase, storage, exposure and disposal from the cleaning process.

Recovered CO₂

Blasting ice is typically made from CO₂ captured as a by-product of other industries, rather than produced for its own sake.

CHAPTER 11

Savings calculator

Dry ice blasting pays back mainly through avoided downtime. Enter your own numbers.

Value of time saved / month₹0
Dry ice cost / month₹0
Net monthly benefit₹0

Starting values are examples only. Replace them with your plant's figures, or ask us to run the numbers with you.

CHAPTER 12

Glossary

SublimationA solid turning directly into gas without becoming liquid.
PelletExtruded rod of dry ice, typically 3 mm or 1.5 mm in diameter.
Micro-particle / shaved iceVery fine ice shaved from a block for gentle, precise cleaning.
Single-hose systemIce and air travel together in one hose; highest impact.
Two-hose / venturi systemIce is drawn into the airstream at the gun by suction.
Thermal shockRapid cooling that makes a contaminant brittle and cracks its bond.
Feed rateHow much ice the machine delivers per minute.
SubstrateThe base material being cleaned, such as steel, aluminium or a mould surface.
Secondary wasteLeftover blast media or water that must be collected and disposed of.
Log reductionA tenfold drop in bacteria per log; 4 log means 10,000 times fewer.
dB(A)A-weighted decibels, the unit used for workplace noise.
PelletizerMachine that turns liquid CO₂ into dry ice pellets.
CHAPTER 13

Research library

Peer-reviewed papers, conference proceedings and industry or government reports on dry ice blasting. Links open the original source.

Peer-reviewed2017

Investigation of the potential of dry ice blasting for cleaning and disinfection in the food production environment

Witte, Bobal, David, Blättler, Schoder, Rossmanith · LWT – Food Science and Technology, 75, 735–741

Cleaning comparable to conventional methods on dairy equipment, but under 5 log bacterial reduction, so not recommended as a disinfection step on its own.

Open paper →
Research article

Effects of a dry-ice process on surface and carcase decontamination in the poultry industry

Manisa Celal Bayar University academic archive

Up to about 3.9 log reduction of total aerobic bacteria on slaughterhouse surfaces; Salmonella inhibited, Listeria still detected on some surfaces.

Open record →
Contractor report2019

Decontaminating food grade surfaces with dry ice blasting (report to the UK Food Standards Agency)

Microchem Bioscience Ltd for the FSA · summary hosted by Cold Jet, an equipment maker

Reported reductions of 10,000 times or more in Salmonella, E. coli and Listeria on steel, tile and food-grade plastics after defined treatment.

Open summary →
Conference paper2025

Development of a CO₂ snow jet blasting strategy for controlling the thermal influence on the substrate

Uhlmann, Polte, Neuwald, Burgdorf, Coakley · Fraunhofer IPK / TU Berlin · euspen 25th International Conference

Slower traverse and repeat passes cleaned oil from stainless steel better but cooled the part more; spiral paths beat meander paths.

Open PDF →
Peer-reviewed2022

Influence of dry ice blasting process properties on surface roughness and residual stresses

Procedia CIRP

Examines how blasting parameters affect surface roughness and residual stresses on machined and additively manufactured parts.

Open paper →
Peer-reviewed2021

Industrial use of dry ice blasting in surface cleaning

Journal of Cleaner Production

Review of where and how dry ice blasting is applied for industrial surface cleaning.

Open paper →
Peer-reviewed · open access2024

Efficient and Sustainable Cleaning: A Comparative Analysis of Cryogenic Technology

Vega-Bosch, Santamarina-Campos, Osete-Cortina, Sánchez-Pons, Bosch-Roig · Applied Sciences 14(15), 6591

Scored 19 dry ice blasting machines from 8 manufacturers on size, weight, noise, tank capacity and CO₂ consumption.

Open paper →
Industry report2002

CO₂ Blast Cleaning Process (Report 1006617)

Electric Power Research Institute (EPRI)

Primer for utilities on cleaning motors, generators, transformers and switchgear in place; about 20% of steam-cleaning time; notes limits on grease and baked epoxies.

Open report →
Peer-reviewed2019

An Experimental and Numerical Procedure for Energetic and Acoustic Optimization of Dry-Ice Blasting Processes

Muckenhaupt, Zitzmann, Rudek, Russ · Chemical Engineering Transactions, 74, 967–972

Tyre-mould cleaning: 8 to 2 bar cut energy and noise but dropped cleaning to about 25%; silencers gave about 9–10 dB(A) reduction.

Open PDF →
Peer-reviewed2014

Decrease in Consumption of Compressed Air in Dry Ice Blasting Machine

Máša, Kuba, Petrilák, Lokaj · Chemical Engineering Transactions, 39, 805–810

A pneumatic ice-shaver drive used about 19% of the machine's compressed air; an electric drive cut process energy by about 17.8%.

Open PDF →
Conference paper1995

A centrifuge CO₂ pellet cleaning system

Foster, Fisher, Nelson, Schechter · Oak Ridge National Laboratory · NASA Aerospace Environmental Technology Conference

Turbine-driven pellet accelerator for stripping military coatings from aluminium panels, more than ten times as efficient as compressed-air blasting.

Open record →
Government

Dry Ice Paint Removal and Cleaning (NESDI Project 590)

US Navy · NAVFAC Engineering and Expeditionary Warfare Center

Planned evaluation of dry ice to replace plastic media blasting at Fleet Readiness Centers, driven by over 100,000 lb of media waste a year.

Open fact sheet →
Peer-reviewed2006

Hybrid Dry-Ice Blasting Laser Processing: Nd-YAG-Laser-assisted Dry-Ice Blasting for De-Coating

Uhlmann, Hollan, El Mernissi · Strojniški vestnik – Journal of Mechanical Engineering, 52(7–8), 458–462

Adding laser heating to dry ice blasting raised coating removal rate by up to 49%.

Open paper →
Peer-reviewed2025

An experimental investigation on the safety performance of dry ice blasting technology

Nuclear Engineering and Technology

Experimental study of the safety performance of dry ice blasting.

Open paper →
Overview

Dry Ice Blasting: an overview of research topics

ScienceDirect Topics (Elsevier)

Collected excerpts from engineering books and journals on dry ice blasting.

Open overview →

Summaries are short paraphrases for orientation; read the original for full methods and results. Some publishers require a subscription for full text.

CHAPTER 14

Frequently asked questions

Will dry ice damage my mould or machine?

Not when set correctly. Dry ice is softer than steel and most coatings, so it removes deposits without cutting into the surface. Start with smaller pellets and lower pressure on delicate parts.

Can I clean while the equipment is hot or running?

Moulds and ovens are often cleaned hot, which saves cool-down time. Live electrical cleaning is possible only under your plant's permit and safety procedures.

How much compressed air do I need?

It depends on the machine and nozzle. Dry, oil-free air in sufficient volume matters more than peak pressure. We size this with you before delivery.

How much dry ice will I use?

It depends on feed rate, pellet size and how long you blast. Use the calculator above with your own figures, or ask us for a trial to measure it on your job.

Does it kill bacteria?

It removes contamination, including bacteria, as well as conventional cleaning, but research does not support using it as a stand-alone disinfection step. Follow it with your normal sanitation.

Is it safe for operators?

Yes, with ventilation, hearing and eye protection, insulated gloves and correct handling. See the safety checklist above.

Should I buy a machine or hire a service?

Frequent cleaning (weekly or more) usually favours owning a machine. Occasional shutdowns or one-off jobs often favour our cleaning service.

Try it on your own part

The fastest way to know if dry ice works for your contamination is a live trial. We bring the machine and fresh ice.

Book a live demoSee the machines
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