[Ronja] Sealant reaction...

[Gyurkó Martin]

Hi!

Thanks for all your answers!

Jakub Sykora írta:
> cite:
> "Your friend (meant you) probably used unappropriate silicon and even 
> silicon glue. Sanitary silicon contains - with highest probability - a 
> reactant, that destroys microbes, rust etc., but it uses active oxygen 
> to reach this effect (free O2 moleculas). This sealant is used in 
> bathrooms. I do not know the manufacturer of this sealant, but it 
> obviously contains per-acetic acid which was used to desinfect places. 
> It simply releases oxygen and stinks like vinegar."

Exactly this kind. It stinks like vinegar when freshly used. It is 
transparent, and I was also using it in building my bathroom.
I now dissassembled the tube, and realized that I was using the original 
rubber ring that was already in the tube, to prevent the lens from 
falling into the tube. This rubber ring is black, and has an oily touch. 
Maybe this ring and its oil was causing the problem.

In bathrooms there is a very unfriendly environment, and i would be 
surprized if any changes in the sealant could happen.
I learned, that the polimerizing reaction of the silicon sealant and 
water from the air is causing vinegar acid, and that it is normal, and 
after finishing the reaction it remains stable, and there will be no 
more acid.

> Be glad, that it broke before you installed it anywhere.

hehe. this is the life of an R & D engineer. I think I will never get 
another kind of job in my life :D

Karel, if you need these pictures, I leave them on the server for 1 
week. Maybe on the Ronja homepage there should be mentioned, that this 
kind of problem could happen, etc...

New picture with the ring:
http://atomblitz.uw.hu/DSCF1439.JPG

bye,
Martin