Polyvinylsiloxane (PVS) Info

[MadMango]

Normally polyvinylsiloxane or polyvinyl siloxane (PVS) is used in dental/forensic applications as an "impression material". I am looking for a material with similar properties that might be used in aerospace applications, as many of the sites I have found limit the sale of PVS to dentists. I cannot find any material properties for this material, and was hoping someone would have familiarity with this compound that can offer some assistance.

We are attempting to use this material to create an "epoxy dam" when potting circuit boards into a housing. We are running 26awg wires through the dam, and the PVS seems to work great as a dam and a strain relief for the wires. We like the fast (20s) mix time, fast (10min) cure time, putty-like (very high viscosity) consistency, and silicone-like pliability.

Our negative experience with RTV is the relatively low viscosity and extended cure time when compared to PVS. Can anyone suggest an alternate or similar material for aerospace use? Does anyone have material properties of PVS?

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[Compositepro]

With your specific requirements you need a formulated system, not raw materials. I'm sure there are a number of potting compound suppliers who can meet your needs.

 

[MadMango]

Currently we are using Scotchcast 8 from 3M for the potting, I will see what they have to say. I was looking for something off the shelf, as our volume is very, very low.

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[patprimmer]

I would be making enquiries with 3M, Wacker, Dow, Bayer, Ciba and GE.

I expect one will have a rubbery compound that is a putty that cures quickly. Atofina (whatever they call themselves now) and DuPont would be other worthy channels of investigation.


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