[PSUBS-MAILIST] potting epoxy

[Alan via Personal_Submersibles]

Brian,
just had a look at the link to the potting epoxy.
Make sure you buy the SS (slow setting) version for larger volume casts.
The other versions seem designed for pouring over wiring & I can't see any
reference as to how thick you can pour it. 
Most of that sort of stuff can crack if you pour it too thick & cure it too fast.
I used to use resins in art work & have had a number of thick sectioned 
pours crack.
If you have already bought the other product; you could use it by doing an
initial pour or brush on, around the wires or pins & when dry, fill in with the
SS stuff.
Cheers Alan 

Sent from my iPad

> On 10/03/2017, at 6:48 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi All,   
>           I got some potting epoxy from McMaster Carr,  problem is, it's not really the best solution for our needs since it is actually a flexible epoxy, it would most likely extrude under pressure.  Luckily in the package with the epoxy that I got,  they sent me a lot of info and a catalogue showing all their epoxy products.   They have some amazing epoxies !  Ceramic, machine-able epoxy, and the perfect epoxy for what I need, which is: potting for my electrical penetrators.  This stuff (Duralco 4461 IP)  is really great because it's very pourable and it has a heat tolerance of 500 F  , that means I can safely solder my #4 stranded copper wire within a close proximity to the potted copper rods !    It's also ideal for electrical resistance. And low shrinkage . 
>  
> Here's a link to the 4461 IP :
>  
> http://www.cotronics.com/vo/cotr/ea_electricalresistant.htm
>  
> Brian
>  
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