From the Cabot website:

"The ability of Cab-OSil fumed silica to aDsorb, (my emphasis), moisture is one
of the properties that makes fumed silica an excellent free flow agent for
lumpy or hygroscopic solids."

So, it would seem Wolfgang is correct in his deduction. I tried his experiment,
dumping some Cab-O-Sil in a cup of water. Some of it floated, but about 50% of
it sank, some all the way to the bottom, some adhering to the sides of the cup.
When the water was carefully removed from the cup, I was able to retrieve some
of the Cab-O-Sil from the sides of the cup, and even though it had been
underwater, it was still dry to the touch.


George Adams

"All good fishermen stay young until they die, for fishing is the only dream of
youth that doth not grow stale with age."
---- J.W Muller