Answer to Loek de Winter


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Posted by Bengt Blomberg on October 23, 2000 at 12:23:30:

Hello Loek,
What you are supposing to do tells me, that you have not
red even the preword of this web site or you just don't
believe what is says.
The most dangerous part in this process is the phthallic
acid formed at the first stage of the hydrolysis.
This can't be dried or washed out as it is nor water soluble
If you use acetone you can remove what has leaked to the surface
by the internal process pressure. Some acetone might enter
deeper and dissolve some acid but then the acetone will
evaporate again without taking any acid with it out.
I can only repeat many earlier answers on this forum:
If you can not afford a repair which is able to remove all
the acid, DON'T APPLY ANY KIND OF BARRIER COAT. THE DAMAGES
WILL JUST GROW WORSE UNDER IT EVEN IF THE TELLTALE BLISTERS
MAY BE DELAYED FOR SOME TIME!!!!!
Water in the laminate does no harm. Instead it cools and thus
slows down the hydrolysis process and washes out some of the
products which otherwise causes pressure within the laminate.
If you do not trust my words I just got the following
message from one of the most reputable European test and research
institutes, the Dutch TNO:

Dear Bengt, this is the translation of the e-mail I received from Aldert
Verheus.

"Fine summary on www.osmosisinfo.com; some descriptions come over a little
unscientifically, but that may be caused by the effort to write it
readable! Maybe it is good to know that the Synthetic and Rubber Institute
from TNO (that doesn't exist any more under that name) in the sixties has
done a similar research and came to the same conclusions.

Best regards,

Center of Lightweight Structures TUD-TNO

Aldert Verheus

-----Oorspronkelijk bericht-----
Van: Aldert Verheus [SMTP:aldert@dutlbcz.lr.tudelft.nl]
Verzonden: zaterdag 21 oktober 2000 11:35
Aan: info@hyab.com
Onderwerp: osmose

Fraaie samenvatting op http://www.osmosisinfo.com; sommige beschrijvingen
komen me een beetje onwetenschappelijk over maar dat is misschien een
gevolg
van het leesbaar willen schrijven! Misschien goed om te weten dat het
Kunststoffen en Rubber Instituut van TNO (dat onder die naam niet meer
bestaat) in de zestiger jaren soortgelijk onderzoek heeft gedaan en tot
dezelfde conclusies kwam.

Met beste groet - Best regards
Centrum voor Lichtgewicht Constructies TUD-TNO
Centre of Lightweight Structures TUD-TNO
ALDERT VERHEUS
=======================================
tel +31(0)15-2781778 / mob +31(0)6-53350208
website http://www.clc.tno.nl
=======================================

Regards
Bengt Blomberg





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