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Re: Cryogenics and Cables

First and fore most, I feel it is important to have precise control over the entire process to achieve the desired results as well as consistent result. The entire process meaning ramping down to deep cryo levels,
holding at a deep cryo soak level, and ramping back up to ambient and beyond. Ramping back up is just as important as the ramp down and soaking stages. Ramping back up can actually reintroduce stresses if done to quickly. There are quite a few different processors available for performing the process, as well as techniques for processing materials. I have heard of a similar technique that you describe, but they used conventional refrigeration methods to get down to minus 120-150F range and then the LN2 was introduced. Once the chamber was full of LN2 and a temperature of below –300F was reached they switched the system off and let it stand for a few days. With the high value items that I treat I don’t think I would have them treated this way. I have also heard of a processor that to ramp back up to ambient means lift the lid on the chamber and let it thaw. First thing that comes to my mind is condensation, similar to taking something out of your home freezer and letting it thaw out. There is also a company proclaiming that they can perform the deep cryogenic process in half the time. I would say to them, if the theory behind deep cryogenics is to slow every thing down (@ micro-level), realign, and form better bonding, how can you accelerate the process? To answer question, proper and effective processing requires control over all stages of the treatment



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