Will urethane foam harm the coating on magnet wire?

[Jim in Idaho]

I wound a 24" coil for my Delta Pulse. I'm using a 1/2" PVC pipe for the body. I cut a slot in the body to allow installing the coil. I'd like to foam the body to hold the coil in place, but wondered if the foam would damage the coil. Thanks
Jim

[kt315]

24" coil for my Delta Pulse. I'm using a 1/2" PVC
----
61 cm coil for my Delta Pulse. I'm using a 1.27 cm PVC

what is your foam? pics of link pls.
whites uses non-shrink foam. sorry, very hard to translate from russian. НЕУСАДОЧНАЯ или МАЛОУСАДОЧНАЯ.

[Jim in Idaho]

https://www.amazon.com/GREAT-STUFF-C...-3&tag=mh0b-20

[kt315]

it is ordinary, standart foam. you need another. GEORGE WRITE NON-SHRINKING FOAM HOW IT IS IN ENGLISH PLEASE.

[Jim in Idaho]

This stuff is an expanding foam. It expands to fill gaps and voids
Jim

[kt315]

you need Монтажная пена с низким коэффициентом расширения

FOAM LOW EXPANSION

https://www.google.com/search?q=FOAM...biw=1263&hl=ru

[Altra]

Hi Jim

"Great Stuff" foam is ok. I have used it for many years. Do not use Dap brand as it is corrosive to copper and solder. Some silicone adhesives are corrosive. It turns out some of these products use citric acid as an activator. Industry uses special silicone adhesives which are non corrosive like Loctite RTV

[waltr]

Hi Jim

"Great Stuff" foam is ok. I have used it for many years. Do not use Dap brand as it is corrosive to copper and solder. Some silicone adhesives are corrosive. It turns out some of these products use citric acid as an activator. Industry uses special silicone adhesives which are non corrosive like Loctite RTV

Correct, most of the common silicon adhesives are corrosive. There are 'electronics' grades that is not.

I wound a 24" coil for my Delta Pulse. I'm using a 1/2" PVC pipe for the body. I cut a slot in the body to allow installing the coil. I'd like to foam the body to hold the coil in place, but wondered if the foam would damage the coil. Thanks
Jim

I would TEST the foam with some of the wire you use.
There are various materials used to coat the wire and many types of foam.
So testing is the only way to be sure the foam/wire will not react.

I do use a polyurethane wood finish to coat coils and does not damage the wire insulation. I did tests before using on a coil.

[Jim in Idaho]

I couldn't find the foam you stated, KT.
Jim

[Jim in Idaho]

I knew testing was the best idea, but the foam hardens in the tube, so if you only use a small amount, you might as well throw the can away....LOL. I was hoping to avoid that. From what Altra said, it looks like it's OK. Maybe I'll wrap the coil with some thin plastic just to be sure. Maybe cut strips from a garbage bag. That should keep the foam from contacting the wire.
Jim

[surfdetector]

I knew testing was the best idea, but the foam hardens in the tube, so if you only use a small amount, you might as well throw the can away....LOL. I was hoping to avoid that. From what Altra said, it looks like it's OK. Maybe I'll wrap the coil with some thin plastic just to be sure. Maybe cut strips from a garbage bag. That should keep the foam from contacting the wire.
Jim

Hi Jim,
I used to hate using the cans of foam due to the waste until I saw this handy tip.
https://youtu.be/sfwizFZrkL8

[Jim in Idaho]

Thanks for the link....good video!
Jim