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[AV Media Matters] Barrium Ferrite posted for Ian Gilmour
Scott and colleagues.
We did some fairly thorough tests on Ba-ferrite tapes for Digital
SP Betacam and DAT within the last 12 months and we found two main
Firstly the coercivity and particle orientation are quite different from
the standard metal particle tapes so it's difficult to record a strong
level with a uniform envelope unless the machines are modified - and who
wants to start fiddling with the manufacturer's specs on their
Secondly, the binders are still a conventional polyester-polyurethane,
which reacts with moisture by hydrolysis in long term storage, so even
though the magnetic particles are stable, you may still end up with an
I would agree with JimW about sticking with some of the respects brands
they're not perfect but they're much better made. Even the housings on
Ba-ferrite tape samples we assessed were not up to the best standards.
Feel free to post this to the list - I'm not signed on at the moment.
Manager, Engineering & Research Group
[the National Film and Sound Archive]
GPO box 2002
Canberra City ACT 2601 Australia.
Phone 61 2 62482027 Fax 61 2 62482165