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.
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
> 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.
> At 09:01 AM 2009-12-18, you wrote:
>> 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?
> 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.