Deep freeze with CO2 fire extinguisher?

Pardon my late reply. Yes you are correct Stromberg Knives Stromberg Knives , I am in Skåne/Scania! Thanks a lot for your tips, a little far from me geographically though :) But the place I found nearby in Malmö sells the CO2 pellets in 5kg (appr 11 lb) packs for about SEK 370 (appr $40) incl VAT. For my predicted low production rate with maybe 5-6 deep freeze occations per year this may be a feasible option. But say I continue doing this for the next 25-30 years at this rate, I am spending more than what a small ULT freezer at -85 C is (given that the freezer holds up)..
Oh, I also taked to a sales rep at Air Liquide (one of the major gas suppliers over here) about different cooling options. He told me that they actually set up a deep freeze station at the Uddeholm steel plant using CO2 gas tanks. Using thermo wells (correct english term?) reaching the bottom of the tank (and hence the liquid CO2) they spray the steel with the CO2 "snow" that comes out of the nozzle. Same principle as using a CO2 fire extinguisher upside down (it will spray "snow" instead of gas as the ejector will be imersed in liquid CO2).
 
Scaniaman said:
Pardon my late reply. Yes you are correct Stromberg Knives Stromberg Knives , I am in Skåne/Scania! Thanks a lot for your tips, a little far from me geographically though :) But the place I found nearby in Malmö sells the CO2 pellets in 5kg (appr 11 lb) packs for about SEK 370 (appr $40) incl VAT. For my predicted low production rate with maybe 5-6 deep freeze occations per year this may be a feasible option. But say I continue doing this for the next 25-30 years at this rate, I am spending more than what a small ULT freezer at -85 C is (given that the freezer holds up)..
Oh, I also taked to a sales rep at Air Liquide (one of the major gas suppliers over here) about different cooling options. He told me that they actually set up a deep freeze station at the Uddeholm steel plant using CO2 gas tanks. Using thermo wells (correct english term?) reaching the bottom of the tank (and hence the liquid CO2) they spray the steel with the CO2 "snow" that comes out of the nozzle. Same principle as using a CO2 fire extinguisher upside down (it will spray "snow" instead of gas as the ejector will be imersed in liquid CO2).
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Interesting... since I can't send you a message through the forum. Would you mind sending me an email (stefan(at)strombergknives.com), I would like to discuss some of this. :thumbsup:
 
Just a note that a deep freeze tank of CO2 isn't the same as spraying a blast of CO2 gas from a fire extinguisher. The tank is at -69F, called the triple point, where the CO2 will exist as a liquid, gas, and solid (snow). If a blade was suspended in the tank, it would be at -69F. The tanks are closed systems, and not something you open up and stick a blade in like a Dewar.
 
Stelian said:
Just wondering, how this idea came up to your mind?
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You are asking me I take it? I think all the info is in the above posts.
Simple answer is because CO2 snow/DI has a temp of -78.5 C Celcius or -109 F.
And I am still tempted to try it, but with a bigger tank (15 kg and up) than what you get with your typical fire extinguisher :)
 
Just a thought, but there currently a lot of small medical clinics, pharmacies, etc that are currently buying small super cold deep freezers in anticipation of the Pfizer covid vaccine (-90 F) and they may be for sale second hand after cheaper and less temperature vaccines are released. And yes, I realize that this is an older thread.
 
I actually just got a pretty high end dewer from a doctor's office that didnt need it any more. It's a 20 liter. I paid $0 for it because they where going to throw it away. My stainless game just went up.
 
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