Hi Richard. Thank you for the info. As for D5 or DVC-PRO thankn god it didn't catch. I get them to transfer from time to time (I do videoo as well as audio) and the error rates are climbing. Since this recordings are 5-7 years old it's alarming. Shai Richard L. Hess wrote: > Hi, Shai, > > Thanks for the kind words. Here is what I said in the ARSC Journal paper > >> Silicones and siloxanes >> >> Decamethylcyclopentasiloxane, also known as cyclomethicone and D5, is >> a volatile siloxane >> that completely evaporates. [Personal communication with Benjamin >> Falk, GE Research Chemist, 12 June 2006] It is widely used in diverse >> applications including the cosmetic >> and personal care industries where it is used to add a slippery feel >> to shampoos and creams. >> It is also starting to be used as a dry cleaning agent. Applying this >> to a squealing cassette >> worked, but one Nakamichi Dragon stopped working for a while as the >> material penetrated >> the mechanism. The D5 was over-applied. One attractive feature in >> this regard is that the >> Dragon healed itself as the D5 evaporated completely over a few days. >> It apparently leaves >> no residue and the evaporation time is, of course, related to the >> amount used. >> >> While successful with cassettes when heavily applied, it has had >> mixed results with >> both 3M 175 and Sony PR-150 in open-reel applications. In both >> instances, the tapes do >> not play all the way through without returning to squealing. The >> problem was made >> worse when the environment that the 3M 175 was being transferred in >> became warmer >> with the advent of summer. >> >> Silicones that are not volatile seem to work better with 3M 175, but >> application methods >> still need refinement. These lubricants seem to work best when >> over-applied, but that increases >> the risk of higher wow and flutter. Perhaps if a fluid is to be >> over-applied, the O'Connell alcohol >> technique may be a better choice as the alcohol is removed and >> evaporates completely. > > I believe that the GE number is SF12 and the CAS number is 541-02-6 > > Do a Google search for Decamethylcyclopentasiloxane and you'll find > lots more including controversy about its safety, but the first link I > get says it's safe > http://www.sehsc.com/d5.asp > > There could be some confusion as "D5" also may be used to refer to > Panasonic's standard definition component digital video format that > became a SMPTE standard, but, while an excellent format, was not > widely adopted. > > Cheers, > > Richard > > At 09:01 AM 2009-12-18, you wrote: >> P.S. >> Richard great summery, you're top ace. I can't find that chemical >> you wrote down as lubricant (the stuff GE is pushing) Can you write >> it again? >> Shai > > Richard L. Hess email: [log in to unmask] > Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX > Detailed contact information: http://www.richardhess.com/tape/contact.htm > Quality tape transfers -- even from hard-to-play tapes.