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Has anyone compared dry ice vs cryo to treat CD's? Cryoing is known to improve the sound of CD's. Thanks, Vasil
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Freezing overnight in the standard home freezer circa 10 degrees Fahrenheit works quite well. Extremely low temps are overrated IMHO.
I have been very happy having Cryogenics International, Scottsdale, Arizona treating my CD's and SACD's. They take the temperature down to minus 320 f. Norm's post about temperature is in Celcius degrees. The cost is maybe 50 cents per CD.
David Pritchard
I used Cryo Pro in MO many many years ago. The cost of home freezer is 0 cents per CD. ;-)
Not zero $$$ buddy unless your reefer is solar powered or you live in the Arctic. The bastards around here charge me for my electricity :^)
a
Yes.
Easy. Almost 2/3 of my Miles Davis CDs..
I am guessing a week? two weeks?
(can't imagine more than two weeks...)
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12 hours in freezer, 2 hours thaw, wipe CD surface clean with Kleenex. Use breath test to ensure data surface is perfectly clear.
Edits: 08/13/12
for 48 hour treatment in the freezer in a zip lock bag, and then simply place on the counter and allow any internal condensation to clear ( about an hour).
Stu
Moisture is not what I was referring to re the Kleenex. It is the MRC that is squeezed out of the polycarbonate during the freeze/thaw. That's the reason for the breath test, to make sure the surface isn't cloudy.
Edits: 08/13/12
Never had any issue with mold release, and I've frozen (I have a -100 lab freezer) many hundreds of discs, including all my recordable discs. (in 100 packs, too)
Stu
By not having an issue with MRC I assume you mean you don't see it. Do you use a CD cleaning fluid prior to freezing the discs? Or after freezing?
Had access to professional polishing machines, but I find that not touching the information side surface always worked better for me.
Stu
I only polished a few times but only to save the disc when there is no other choice. I don't like the idea of scratching the surface of the disc.
I'm not a big fan of polishing, either. You might be surprised if you try one of the top CD fluids. Just saying.
Is the mold release mixed in with the resin or is it being soaked up from the cavity during the shoot? Sony used to have a plant just a couple miles from here but I never got a chance to see it I'm action. Oddly enough they left the day their tax exemption ran out. Appalachia West...
Rick
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Mold release compound is my guess
Julien
Cryogenics achieves -196ºs F. There are differences in cryogenic treatments which have never been assessed on what is treated.
I prefer the treatment with a Tesla coil done by Synergistic Research.
Norm....you meant to say -196C., not F. The equivalent in Fahrenheit is -320F.
But you are so correct regarding "differences in cryogenic treatments". Most facilities cannot achieve more than -295F. or -300F. on their best day. There are only a few that achieve the boil-off point of LN2, which is -320.4F. Cryogenics International, the facility I use, is one of them.
A little clarification on temperatures - if I may:
Dry Ice - Solid CO2 (carbon-dioxide) sublimates at -78.5 degrees C, or -109.3 degrees F
There is no 'melting point' as CO2 sublimates - goes from a solid to a gas with out spending any time as a liquid.
Nitrogen Melts at -209.86 C( -320.148 F), and boils at -195.8 C (-294.84 F)
Liquid nitrogen is commercially available, and in the liquid form would generate a temperature between the two - usually closer to the boiling point.
Helium has a melting point at -272.2 C (-432.36 F) and a boiling point at -268.93C (-426.474 F). Liquid Helium is commercially available - used to keep NMRs (Nuclear Magnetic Resonance Imaging systems) operating.
Absolute Zero - 0 degrees Kelvin = -273.15 C = -434.07 degrees F
Cold Stuff!
Happy Listening
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