15 Minutes Water Treatment - CIAK Sketchbook

Today's a rainy day and I recall in many occassions I had to write notes on my Moleskine in the rain.  I try to visit as many retail stores as possible during every business trip, so taking notes of these store visits is very important.  So to evaluate a notebook's durance I would deliberately soak it for 15 minutes and see what happens in extreme conditions.  Haven't tried fire though.
This time I tried CIAK's sketch book.  I just threw it to my sink and add water.  It floats!  So in the most extreme case when you are hit by a typhoon/tornado and land in water, your CIAK notebook will float, and if you float too you won't have difficulty finding it.
To my surprise, the 15 minutes water treatment didn't ruin the notebook a lot.  Only the first and last ~10 pages were seriously wet because paper glued to the inside of the cover and back were totally wet.  All the other pages were wet only 1-2cm from the edge.  I figured this amazing result is probably because of the strong elastic band which held the book close so tight water couldn't get in between the sheets, so for 15 minutes water went in slowly through "seeping" (i don't know how it's called).
The bookmark naturally took in water significantly and this led to wetness in 3-4 pages in contact with it.  It also became easy to detach from the spine probably because it was glued to the spine using water based glue.  The spine which is the most important part of a notebook remained intact and pages were not falling off, however it had signs of possible detachment from the cover just a bit, probably also because of the water based glue.
The cover was darkened only from the edges around 3-4cm, this lead me to believe that the cover surface is waterproof but water can seep through the pores from the edge.
Finally, after leaving the notebook to dry in open air for about 6 hours, the cover color turned back to normal, the bookmark remained fixed to the spine, the pages has wrinkled a bit but still good to use.  I believe if it were blown dried with pressure applied to maintain paper shape, it could turn back to a 98% original condition.
If I have the time, I'd devise a series of standard tests for evaluating notebooks in terms of durance and paper quality, will be fun and interesting to do this comparison..... if only I have the time (or being paid to do so).