Using MS Polymer as a potting compound

[jfiresto]

Has anyone used MS Polymer construction adhesive as a potting compound? I want to pot the connector and wires at the end of an adapter cable, I can wait, and I do not need more than roughly 5 mm of cure depth.

I have some UHU Ultra construction adhesive (381 Kbyte TDS) which sticks to almost anything, does not shrink and has a Shore A hardness of 70, that of a typical car tire.

[SMTech]

Well its non-acidic which is typically the first stumbling block when using silicon sealants/adhesives with electronics.
Electrical conductivity you could test
Depending what you are  potting, thermal conductivity could be an issue, I don't see numbers for that so who knows.

[jfiresto]

Thank you for that tidbit.

I searched a bit more and found a company that is marketing MS Polymer as – yes indeed – an electronic potting compound (508 kByte PDF). They don't say much about the limited cure depth.

Since the stuff came out of Japan, I should add, it is also good in earthquakes. 

[xavier60]

TB1530C is one of the few moisture cure sealant/adhesives that is liquid. I haven't actually used it for potting, I have used it to seal off high voltage transistor pads.
https://threebond-europe.com/products/tb1530c/
The product can be difficult to source.

[jfiresto]

Thank you for the link to a quite useful datasheet, clearly written by practitioners to help other practitioners. I think MS Polymer will be the right stuff. When I get a chance I am also going to have see if it really does bond to nylon.

[xavier60]

I have also been using this product although it's not a liquid,
https://www.vipfast.com.au/product/hb-fuller-toolbox-invisible-ms-adhesive-sealant/

[jfiresto]

Hmmm. That one has a Shore A hardness of 49. I am getting the impression that clear implies softer.