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Permeability issues relating to sealing compounds

Permeability issues relating to sealing compounds

Permeability issues relating to sealing compounds

(OP)
Does anybody have any knowledge relating to Permeability issues relating to various sealing compounds. We have a problem with water ingressing into a small vacum on one of our components (Volume in the region of 1.7x10-5 m3) . Having carried out numerous investigations all evidence seems to point to ingress through the compound used to seal the volume.
I have tried to use Darcy's Law and various permeability values given by material suppliers to calculate the mass flow rate across the seal, for different materials, but i keep coming up with unrealistic answers. I was wondering if anybody had any similar experiences or advice.
Any advice greatly appreciated.
Thanks

RE: Permeability issues relating to sealing compounds

I'm curious about what compounds you have tried, and if you are referring to thixotropic pastes or to elastomers when you say 'compounds'.

I don't have much experience with water ingress into evacuated cavities.  I do have some experience with air ingress into water under slight negative pressure in elastomer tubing.  In that instance, silicone was a nightmare.  Viton worked much better.

Mike Halloran
Pembroke Pines, FL, USA

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