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.
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