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Nearly all European broadcast archives (millions of tapes) use "pancakes" on
100 mm DIN hubs.
Broadcast standard tapes (made by BASF, Agfa) are back coated for proper
winding and packing.
Only when played on non-professional machines (e.g. Revox) with insufficient
tape tension, packing may become loose and risk falling apart.

Jos Van Dyck
NGM Archiving Solutions

David Seubert wrote: 
>
> It might be a waste from a certain perspective except that
> (if I remember correctly) the AES standard for storage of
> polyester audio tape recommends NAB hubs with flanges.
> You can certainly play pancakes on some decks without flanges
> and store them without flanges, but from a preservation standpoint,
> they really should have flanges. There are some trade offs here.
>