acetone and dry ice

v-6

v-6

Joined
Nov 24, 2007
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952
How mush acetone and dry ice do you need for one blade blank?
how do you mix this stuff and what do you mix it in.
I just trying to get ready for some ats34 thats on the way.
Any tricks or anything to do with this steel, i would be grateful
hearing about it.
thanks vern
 
Acetone goes boom too quickly, try kerosene. I used a Stainless steel pot that I had gotten at the local dollar store for like 5 bucks. put it in an ice chest full of ice with the dry ice and kerosene in the pot. I cant remember what the blocks of Dry ice were in size jut that they came in blue bags and were the size of a regular hardback book.

I forgot I did put rock salt on the ice in the Ice chest.
 
I use a old cooler. Put a pot or heavy aluminum pan in the cooler, put the dry ice (10lbs)in the pot lay the blade on the bottom add acetone (or kero), enough to cover the blade. Leave the blade in the pot till dry ice is gone (overnight) I use acetone because its less messy than kero. I do the cryo outside so I don't worry about explosions. I had several knife makers say they prefer acetone because it gets colder? with the dry ice.
 
I'm curious. If you put the dry ice and acetone mixture in a liquid nitrogen dewar, how long would it stay cold? Has anyone tried this?
 
I wouldn't worry too much about acetone, it isn't that bad. Kerosene freezes between -20 -70. Acetone -100, which is what you're going for.

You want about three pounds to do one blade, but you'll probably end up with about five because that is the smallest I've seen them sell it.

Bust it real good and put it in a metal container. Pour in the acetone, ideally you have a nice slush. You'll notice that at -100, the acetone doesn't make the fumes, in fact you can barely smell it at all. Stick in your blade and leave it 2 - 8 hours (I do not understand why Mf would be time dependant - but time in cryo matters for some reason, I use 4 hours). I put it in a beer cooler at this point

When you reclaim the acetone, do it outside and don't cap the container very tight because it may be carbonated and need to outgas for a day.
 
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