Question about DECtape formulation
go at ao-cs.com
Mon Jan 24 15:43:29 CST 2022
On 1/24/22 11:09 AM, Chris Zach via cctalk wrote:
> It sounds more like some sort of sprayed-on coating of some sort of
> abrasion-resistent material. It might well be porous, which would be
> a possible explanation for the oxide coming off when rubbed with solvent.
> Is it possible we're looking at something called "dirt"?
Not likely, as it's on all of my tapes, including the four 'unopened'
(well, there opened now...) tapes I had in my stash. Brand spanking
'new' in blue plastic boxes, still with seal on tape. I even had an
unused 'scotch' brand that had the seal on the tape, though that one
came in a paper box, so conceivably it could have been 'contaminated'.
But it still looks the same.
Also, in reference to another comment: the 'oxide' isn't coming off
exactly. I did have one tape with some really ragged ends on it, and on
that one, the oxide did flake a bit. But that tape had other damage on
the leader end. For the rest of them (tried so far) all I can say is
the oxide appeared 'exposed' but on several different tapes I tried
'scraping' this exposed layer with an exacto knife and all that happened
is some scratches appeared on the 'overcoat' layer. No oxide residue on
Sorry if it appears I implied the oxide was degrading. May on one or
two, but this is not a feature of the other 100-ish tapes.
I'm guessing it *is* some kind of spray-on 'extra' lubricating coating,
so I'm just trying to figure out what it is. Obviously it's extremely
soluble in iso, but that's the 'strongest' thing I've tried. As I think
I mentioned, even water will degrade this layer with some rubbing, but
alcohol takes it off quickly. 'Dry polishing' the tape doesn't seem to
degrade the coating, though I do seem some 'smudges' left on the kimwipe.
This issue isn't standing in my way of completing the project - I was
just checking the 'collective conscience' here if any knew some
unpublished secrets or where they were published if not secret.
Thanks for all the replies.
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