[Ronja] Sealant reaction...

[Jakub Sykora]

As you can see on the pipe label - it is not made from PVC 
(poly-vinyl-chloride), but from PP-H (homopolymer polypropylene). These 
are very different materials.

I have sent this question to my friend - chemical engineer - if he could 
explain it.

K

Gyurkó Martin wrote:
> Hi Everybody!
> 
> I sealed about 10 months ago a lens into a PVC tube with a transparent 
> silicon sealant.
> I did not have time, and forgot the whole project in my craftsroom. 
> Dark, normally tempered, with low humidity.
> Now I found it with a shocking result:
> 
> http://atomblitz.uw.hu/
> 
> The sealant turned brown, and it also detached from the PVC pipe.
> Maybe a chemical reaction, but i have never seen this kind before.
> I made pictures of all the used materials.
> 
> Did anyone have similar results?
> 
> Bye
> Martin
> 

-- 
Jakub Sýkora
email: kubajz na kbx.cz       <')
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