I have problems finding silicone (preferably black) which doesn’t harm electronics, is non-corrosive and non-conductive for e.g. sealing electronic parts (or close to electronics/battery), support the capacitors on the PCB, glue/seal copper bars/wires or solder joints and glueing 18650 cells together…
I’ve bought RTV silicone from an electronic store but it is acetate cure which is not good for any electronics.
I’ve bought neutral cure silicone as recommended by the community. Well it stinks like hell because of fungicide.
All neutral cure silicones I can find are made for construction/windows and so on. It’s not in the description but it seems like most of them have fungicide inside. Or is this no problem?
I found some products which might be suitable but I’m not sure (german links)
It was just the first I found and we use it on mass at work, but never directly on electronics.
Maybe check the sika home page for more details.
One good thing on it, it sticks like hell.
You can glue everything together and be sure you will not get it off without to cut it.
And it doesn’t smell as min not the one we use
It’s from a Sweden site and I can’t open other Eu loctite sites… idk why…
I‘m sure you can get it also close to you, but could be a bit more expensive…loctite usual
I use black 521, but I wonder what is the difference with the 221 ?
521 has no solvents (no isocyanates), no PVC, no silicone it’s why I choose it but I would like one 100% sure for electronics too, for my ESCape !
Thanks a lot for your suggestions @Andy87@amazingdave@Riako@bigben
I didn’t anwer because I’m still digging deeper and deeper in the endless internet, it takes forever…
Meanwhile I found some silicones especially for electronics but still searching for the best links/prices before I post it here. BTW the Loctite 719 is only available in sweden even Loctite doesn’t list it.
TIme for an update. For sealing enclosures and gluing cells I’ll take sikaflex.
For sealing electronics I’ve found some expensive stuff but finally found the cheap version of it at HK
Check the links above, they are in EU stock right now and made for PCB’s and any electronics. Mabye the K703 is harder because it’s also for strain relief of cables. I’ve bought both and test the difference first, gonna use it e.g. to secure the capacitors to the PCB and sealing/insulating solder joints.
The expensive version of such silicone for electronics I’ve found is made by ACC SILICONES:
AS1700
AS1701
AS1703
AS1704
AS1724
AS1725
AS1740
AS1745T
AS1745G
Meanwhile I received the Hobbyking silicones, ordered 3x K-703 and 3x K-705 and got 6x the transparent K-705 wtf
Did some tests with different materials and waiting for curing.
The consistency is very strange, more like a thin fluid, it floats in all directions and has no structure like normal silicone. It’s almost useless, maybe it’s good for gluing or coating but that’s it.
After 17 days, many e-mails and 2 RMA’s at Hobbyking I finally received the white silicone which is much better than the transparent one. It keeps the shape like silicone should be
Here the link again
Will upload some pics later when there is space again.
Offtopic but some words about CA (superglue). I’ve tried different brands and am shocked about the heavy differences.
As reference I glue 4x AA cells in a row together (did that with 18650’s, too.). With e.g. CA from Hobbyking it’s no problem to tear them apart even without twisting. WIth proper CA it’s impossible to tear them apart, no way! Only after vey heavy twisting the foil breaks and you have the naked cell in your hand.
BTW proper can be dirty cheap, my favourite CA is from the local shop KIK, 5x2gr. for 1€.
I also test silicone with AA cells before using it on 18650’s to know the strength. The transparent HK silicone for example is rubbish, wouldn’t call it a glue. I’m looking forward to test the sikaflex when I receive it and see if CA is still necessary.
as min not the one we use 
even Loctite doesn’t list it.
