FAQ's

Looking for more information? Here are some of the most common questions that we're asked. If your question isn't answered below, please contact our office.

1

What is Dry Ice?

Dry Ice is the solid form of Carbon Dioxide (CO2). CO2 is a colorless, tasteless, odorless gas found naturally in our atmosphere.

 

2

Why would I use dry ice instead of a traditional blast media?

Most other blast media leave secondary waste behind. Dry ice sublimates (vaporizes) upon impact with the surface. All that remains is the contaminate you are removing. Also, since dry ice vaporizes on impact, the process can be used to clean complicated cavities where typical grit blast media will become trapped.

 

3

How does the process work?

Unlike other blast media, dry ice has a temperature of -109F (-78.3C). Because of the temperature difference between the dry ice particles and the surface being treated, thermal shock occurs during the process of dry ice blasting. This causes a breakdown of the bond between two dissimilar materials.

 

4

What happens to the contaminate?

A: Contaminates can be dry, wet, hard or soft. Dry contaminates will break up into small chips and can be swept up or vacuumed. If the particles are large enough, they do not become airborne. If the contaminate is wet, such as grease or oils, the Cold Jet stream will move or push the liquid away much like a high pressure water stream would, except that the surface where the contaminate was will be dry and clean. To prevent redeposition, the operator should work in a methodical way, from the top down.

 

5

Do the contaminates or dry ice pellets ricochet?

Upon impact, dry ice pellets sublimate to a gaseous state and therefore dry ice particles typically do not ricochet. The removed contaminant is usually washed away by the blast jet stream and does not come directly back into the blast gun vicinity; however, safety glasses must be worn at all times during the operation of the machine.

 

6

What is Dry Ice?

Dry Ice is the solid form of Carbon Dioxide (CO2). CO2 is a colorless, tasteless, odorless gas found naturally in our atmosphere.

 

7

Will dry ice blasting damage the substrate?

The Cold Jet dry ice blasting process will not damage the substrate. The size of the dry ice pellets and their velocity can be optimized to remove the contaminate while being non-abrasive to the substrate. The Cold Jet process can clean delicate chrome or nickel plated tools, soft aluminum or brass alloys, wire insulation, and even circuit boards without causing damage.

 

8

Can you use Cold Jet dry ice blasting to clean hot tools online?

Yes. In fact, dry ice blasting cleans faster when the substrate is hot

 

9

Does dry ice blasting cool the substrate?

Yes, but not dramatically. The amount of cooling depends on the substrate material, the dwell time of the dry ice blast stream, and the dry ice usage. For example, a 30 inch (76.2 cm) by 30 inch (76.2 cm) rubber mold may have an initial temperature of 325F (162.8C). After the tool has been blasted clean (approximately 12 minutes), the temperature of the mold is about 300F (148.9C).

 

10

Will the temperature drop damage the hot mold?

Generally, no. The temperature change of the surface being cleaned is small and the corresponding tensile stress will be well below the point of what most molds will encounter during normal heat treatment.

 

11

Will the process create condensation?

Condensation occurs when the temperature of the substrate falls below the dew point. The dew point varies with climate and the daily weather patterns. When cleaning hot substrates, condensation will rarely occur because the temperature of the surface will stay above the dew point. If condensation does form, you can control it by using heaters, heat lamps, or blow off devices.

 

11

How much air will I need?

A typical Cold Jet dry ice blast system operates at 80 psi (5.5 bar) with 150 scfm (4.25 m3/min), however your needs wil depend on your application. Low flow nozzles are available, which require only 50 scfm (1.42 m3/min) at 80 psi (5.5 bar).

 

12

How portable are the dry ice blasting machines?

ne pearson can easily roll any of the machines around the plant floor without any special equipment.

 

13

Is it safe to us dry ice blasting outside?

Yes. CO2 dry ice is safe to use in outdoor blasting applications. In fact, many organizations have given Cold Jet their stamp of approval for the use of dry ice in outdoor blasting applications, including the California Environmental Protection Agency.

 

14

Is it okay to blast in an enclosed area?

Yes, with proper ventilation. Because CO2 is 40% heavier than air, placement of exhaust vents at or near ground level is recommended when blasting in an enclosed area. In an open environment, existing ventilation is sufficient to prevent undue CO2 buildup. Even though CO2 is non-poisonous, it does displace oxygen in the atmosphere.

 

15

How loud is the system?

Noise is a function of air volume and air velocity. Within the nozzle, the stationary air is sheared by the high velocity air causing turbulence which creates noise. With appropriate hearing protection an operator can safely operate the system all day.