I've been going through a stack of
"material-sciences" text/reference books over the past month with the specific agenda of finding 'suitable' lightweight/superstrong materials.
and their physical properties
Kevlar(29) as usual was high on
the list; so were graphite fibers; and graphite-epoxy composites, etc...

I came across some values for [woven] graphite fibers that appear to be "too good to be true".
The physical properties for [woven] graphite fibers, listed in one text-book, gave a density value as
low as 0.5 gm/cm^3 [half that of water] and a tensile strength of 1.7 GPascals [250,000 PSI]

MOST of the reference/text-books gave
density values for [woven] graphite fibers of between 1.7-1.8 gm/cm^3 and
tensile-strength values ranging between
200,000-784,000 PSI.

So what about that so-called low-density value of 0.5cm/m^3 [31.2Ibs/ft^3]...A typo in that textbook?...Legit?... Or too-good-to-be true?

Jacob