[QuadList] Plasticizer

[rabruner at aol.com]

If I am thinking of the same thing you are describing, there were two incidents I can recall from the era of the 70s and 80s.  I believe it mostly affected 3M tape.  The tape would precipitate a white powdery residue that would stick to guides and fixed heads on the machines during play and then on rewind, it would scratch the tape.   At first there was a considerable reluctance to admit there was a problem, but then after a time,, 3M had a program to swap out reels that had the issue. It's been a while but I think this affected 400 series tapes, maybe 420?  I am sure not every reel got returned, so there is probably still some of it out there.  I don't believe there was ever any definitive explanation of what had happened, evidently some change in a manufacturing process that had to be undone . .. 
Bob Bruner
W9TAJ





Attached Message


From:
Walter Forsberg <walterforsberg at gmail.com>

To:
quadlist at quadvideotapegroup.com

Subject:
[QuadList] Plasticizer

Date:
Wed, 17 Mar 2010 10:15:02 -0500



Hello Quad Groupers-
 
I'm looking for info / documentation / personal experiences any of you may have had with white plasticizer, offering itself up from the winds/packs of 2" and 1" videotape. 
 
Specifically, are there any trends or commonly believed reasons for this stuff appearing? (Eg. specific stocks, a particular environmental storage condition, or manufacturer's container / reel materials.)
 
I'd also be happy to receive a quoted forward of past discussions on this topic, as I'm a relative newbie to the list. 
 
Happiest shamrocks & thanks in advance,
 
Walter Forsberg
NYU-MIAP
 





-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://quadvideotapegroup.com/pipermail/quadlist_quadvideotapegroup.com/attachments/20100317/36afbb9b/attachment-0004.html>