George, the fiberglass tape they're referring to is a
fairly thick weave. It's a bit like the stuff used in
auto-body repair, but tighter weave. The stuff I have
also has a binder of some sort, which helps it adhere
to the core.
The primary purpose of the tape is to protect the
magnet wire insulation from the core. If the
equipment is used in an environment where vibration is
normal, the wire can end up rubbing against the core
and cutting through the insulation. Also, some cores
are not tumbled enough, and have sharp edges. If you
use something like electrical tape or kapton for this
purpose, then the rubbing and/or sharp edges can
ultimately cut through the tape. The fiberglass can
withstand the physical abuse better.
I got both fiberglass tape and kapton tape from
Bytemark at Dayton a couple of years ago. That
company is in the business of building RF transformers
and supplying materials to those who wish to wind
their own. They also do a minor business in
ferrite-based switchmode power supply transformers.
Go to "technical information", then the link "pricing"
at the top of the page. There, you'll find the Scotch
27 glass cloth tape, as well as the Scotch 92
polyimide (aka Kapton) tape, and teflon sleeves and
many varieties of wire suitable for winding
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