In general, PVC cannot be epoxied.
There is nothing wrong with mechanical fasteners on a PVC pipe. Anybody
with internal arcing on the inside of secondary is doing something else
wrong. The voltage at the bottom of the secondary is zero. There is no
reason to overcomplicate something as simple as a binding post.
PVC pipes are not clean when you buy them.
Wash and scrub them, including the bore before use. You don't know what
release agents or plasticizers are on those surfaces. PVC pipes (or
anything made of "PVC") is a complex mix of additives as pure PVC is
completely useless as a final product.
It can be noticed that PVC isn't used in the electrical industry outside
of low voltage wire insulation. It's not a great choice, especially for
high voltage applications. We just use is as it's good enough, and at
least in north america, very available, and at a reasonable price as it's
the cheapest of all plastics.
On Wed, 18 May 2022, Joshua Thomas wrote:
> Hi Jim,
>
> It looked to be the copper side that failed. I had cleaned both surfaces
> with isopropyl before using the epoxy; perhaps I needed to wait a bit long
> for the iso to clear up.
>
> I really not have had any great results trying to use epoxy (Bob Smith
> brand, in this case) with plastic surfaces; but most of my epoxy experience
> is with amateur rocketry, which uses material like phenolic and woods.
>
> Joshua Thomas
>
>
>
> On Wed, May 18, 2022 at 8:14 PM Lux, Jim <jim@xxxxxxxxxxxxx> wrote:
>
>> On 5/18/22 4:43 PM, Joshua Thomas wrote:
>>> Hello Mads,
>>>
>>> Thank you for reminding me of your site, I had used it before as a
>>> reference. I have been sticking to the ?rules? of not putting any holes
>> in
>>> the secondary, but I see you?ve gotten away with it on occasion. I might
>>> try using a nylon bolt threaded from the inside to outside as a place to
>>> terminate the bottom of the coil.
>>>
>>> On that note, do you have any recommendations for adhesives for
>>> plastic-plastic (pvc) and metal-plastic bonding? The epoxy I used to
>> hold a
>>> piece of copper to a pvc pipe was a complete failure.
>>
>> Which side of the joint failed? The copper or the PVC? You have to be
>> scrupulously clean.
>>
>> I use silicone sealer (like for tubs or aquariums) for a general purpose
>> "glue" - it sticks to most stuff pretty well. It's not good
>> structurally, but for something that's not seeing a lot of loads it
>> works ok - good epoxy joints are stronger than the material in some cases.
>>
>>
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> --
> Joshua Thomas
>
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