The battery builders club

Anyone have any recommendations for electronic grade silicone available on Amazon?

Just look for ‘neutral cure’ silicone

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This one says neutral curing but doesn’t say electronics under uses. Thoughts? Also there seems to be a scarcity of neutral cure silicone in Canada :pensive:

If it smells like white vinegar (acetic acid) it’s the wrong stuff. If it smells like paint drying (methylethyl ketone oxime) or like your wife’s nail polish remover (acetone) then it’s the right stuff.

GE Advanced Silicone 2*, color clear, in the 2.8oz containers, more than one of them. I buy boxes of twelve tubes but you may only need a couple.

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I thought one would be enough :dizzy_face: I’ll have to delay my building and buy higher volume from US

These are also available in the “Paint” section of a local big-box home improvement store like Menard’s, Lowe’s, or Home Depot if you’re in the US.

They’re the only esk8 part I buy offline in the USA.

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The one you shared says kitchen and bath and doesn’t specify as neutral cure. How do you tell it’s okay before ordering?

I use it all the time, and it also says “Won’t Blemish Metals” on the packaging.

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I’d like some advice as to what way I should connect my P groups.

I’ll be using .2 thick nickel. I have a preference for option A as this allows me to have all my wiring and connections at the back of my battery box.

Option A

Option B

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I actually did a build just like this, here is what I did.

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I actually really like how this came out. It’s super clean lol

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Damn boi that shizz clean af :pray:

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OMFG, This is next level. Thanks heaps for posting this.

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They won’t say electronics grade.

Look at the warnings on the back: If it says “warning, emits acetic acid during cure blah blah”, it’s acid curing and should not be used.
If it says “warning, emits methanol and ammonia blah blah”, then it’s neutral cure and is good.

GE advanced silicone II+ or II* is my go-to, since I can get it in the local hardware store.

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Is it incorrect to assume that once cured there is no more offgassing?

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Yes. Once the silicone has cured fully, it stops outgassing.

Depending on the thickness of the layer, that can take quite a while though.

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One thing I’ve noticed is that sometimes it takes a LONG time to completely finish curing, depending on how thick it is, if it’s many centimeters deep it could take 3 or 5 DAYS to completely finish and if you seal the enclosure before that it will stop curing when the contained oxygen runs out. Unless your shizz isn’t water-tight, then it will continue to cure inside.

Using butyl tape has me waiting a few days to seal up the enclosure because of this annoying phenomenon. End result is worth it though.

I’ve legit opened an enclosure that’s been sealed for months and it had soft uncured silicone inside…but only on the inside. The skin of the silicone (3mm-ish) was well-cured as well as any parts that were thin (which was most parts).

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So considering in this circumstance where there really is no sensitive components (apart from BMS), as long as it was fully cured before it gets locked up in the enclosure, then its probably not a big deal to use the acetic stuff right?

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I still really wouldn’t. The acetic acid vapor is really corrosive and will fuck with electronics. It will tarnish copper and brass easily, and aluminum, steel and nickel aren’t completely immune either.

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Fair call, worth the discussion.

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