Hello,
Gray pvc or conduit I believe is made to be UV resistant.
Arc Angel
On Thu, Apr 30, 2020, 10:41 PM Steve White <steve.white1@xxxxxxxxx> wrote:
> Hi Terry,
>
> Fortunately my Maxwells are not in the direct line of site of the spark
> gap. My PVC tube is white, not gray. Maybe there's a difference in UV
> sensitivity.
>
> Steve White
> Cedar Rapids, Iowa
>
> ----- Original Message -----
> From: "Terry Oxandale" <Toxandale@xxxxxxx>
> To: "Tesla Coil List" <tesla@xxxxxxxxxx>
> Sent: Thursday, April 30, 2020 11:22:25 AM
> Subject: Re: [TCML] Susceptibility of G10 and GP03 to UV radiation
>
> Interesting thoughts. I'm using Garolite (CE I believe) for my spinning
> disc, and have seen no signs of UV degradation (sufficiently strong, but
> not as strong as the G10). Everything else in the immediate area of the SG
> is gray PVC sheet, which appears unaffected by the UV, and has never been a
> resistivity issue at the pig voltages. I'm curious about the Maxwell casing
> risk?
>
> Terry
>
> -----Original Message-----
> From: Tesla <tesla-bounces@xxxxxxxxxx> On Behalf Of Steve White
> Sent: Thursday, April 30, 2020 9:36 AM
> To: Tesla Coil List <tesla@xxxxxxxxxx>
> Subject: **External Email** [TCML] Susceptibility of G10 and GP03 to UV
> radiation
>
> I have a large Tesla coil (6.5 KVA) which uses a RSG (rotary spark gap).
> The insulating parts of the RSG are made of several different materials.
> The base is made from a sheet of GP03 which is frequently used on outdoor
> HV transformers. Many of the support structures, including the RSG rotor,
> are made of G10. Does any one know what the susceptibility of G10 and GP03
> are to UV light as emitted from a spark gap? These materials are about 6"
> away from the spark gap.
>
> I have been using this RSG for several years now and it has held up well
> with no problems. While recently inspecting the underside of the base of my
> TC I noticed that a 4" x 4" section of the PVC secondary coil tube was
> yellowed because it is in the direct line of sight of the spark gap which
> is about 12" away. I do know that PVC is highly susceptible to UV light so
> I plan on shielding that spot with a little bit of aluminum tape. However,
> this episode got me to wondering about the integrity of the RSG parts which
> are made of G10 and GP03 which are also in the direct line of sight of the
> spark gap and are much closer. I can see no apparent discoloration.
>
> Do I need to add some sort of UV shielding to those parts? There's not
> much that I can do about the G10 rotor since it spins at 3600 RPM and must
> maintain excellent rigidity and also remain an excellent insulator against
> 14.4 KV RMS. I also can't use the aluminum tape on the support structures
> for UV shielding as I did on the PVC tube because they must insulate
> against 14.4 KV RMS. I do happen to have a lot of teflon tape which is
> claimed to be UV-resistant so I could possibly use that if needed.
>
> Steve White
> Cedar Rapids, Iowa
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