Stephani Stephenson on sun 25 jun 06
Sam and all,
I started to comment on terms porosity and absorption.(I still think of
them as terms which do not have the same meaning)
found a wealth of info, including posts from Jon Pacini on Laguna
tests for absorption (pressure cooker v. boiling), which may explain
some variation in results...
some good posts from Eleanora Eden on testing, and info as well as
questions from lots of other folks...
I went to the archives
typed in
absorption porosity
in the Search
" For:" box (not the subject line box)
if you search since 2000 you get 28 entries.
Stephani Stephenson
steph@revivaltileworks.com
http://www.revivaltileworks.com
Sam Kelly on tue 27 jun 06
Thanks Stephani, will add it to my links.
Sam
Brian Fistler on thu 29 jun 06
On Sun, 2006-06-25 at 21:10 -0700, Stephani Stephenson wrote:
> Sam and all,
> I started to comment on terms porosity and absorption.(I still think of
> them as terms which do not have the same meaning)
>
> found a wealth of info, including posts from Jon Pacini on Laguna
> tests for absorption (pressure cooker v. boiling), which may explain
> some variation in results...
> some good posts from Eleanora Eden on testing, and info as well as
> questions from lots of other folks...
Also, from Joe's post, if he is testing "within several days" of firing,
the test tiles are going to have absorbed a certain amount of moisture
from the surrounding air. (Very dependant, of course, on relative
humidity, stoarge conditons etc.)
Tests done this way (as opposed to weighing immediately after removal
form the kiln while still warm) would indicate less absorbtion since the
piece is going to already have absorbed some moisture from the air
before being weighed, therefore the weight gain would be less, showing
lower absorbtion rates than if they were tested immediately.
Brian
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