Author Topic: Effect of UV radiation on white PVC  (Read 840 times)

Offline MRMILSTAR

  • High Voltage Engineer
  • ****
  • Posts: 320
  • Karma: +10/-0
  • Cedar Rapids, Iowa
    • View Profile
Effect of UV radiation on white PVC
« on: May 02, 2020, 05:41:09 PM »
About a week ago I was inspecting the base of my SGTC (6.5 KVA) and saw this brown spot on the bottom of the secondary coil form. This spot is about 4" x 4" and is in the direct line of site of my RSG electrode gaps. Its about 12" away from the spark gap. The UV radiation from the spark gap is so intense that it has turned this spot on the PVC tube brown. Total exposure time to UV was probably about one hour.

My fix was to use aluminum tape to cover that spot and protect it from further UV radiation damage. The pictures show before and after the patch.

The lesson learned is to remember that white PVC is very susceptible to UV radiation damage.
« Last Edit: May 02, 2020, 09:22:21 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline Bradselph

  • High Voltage Enthusiast
  • *
  • Posts: 16
  • Karma: +1/-0
    • View Profile
Re: Effect of UV radiation on white PVC
« Reply #1 on: May 03, 2020, 12:45:33 AM »
What would be the long term effects if left unprotected?

Would it just cause it to be brittle like a old pipe that was beat on by the weather?

Offline MRMILSTAR

  • High Voltage Engineer
  • ****
  • Posts: 320
  • Karma: +10/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: Effect of UV radiation on white PVC
« Reply #2 on: May 03, 2020, 05:17:03 AM »
It becomes crumbly and brittle. I've heard that the brown areas can also become conductive.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline John123

  • High Voltage Engineer
  • ****
  • Posts: 227
  • Karma: +4/-0
  • All the gear, no idea. UK
    • View Profile
Re: Effect of UV radiation on white PVC
« Reply #3 on: May 03, 2020, 11:16:04 AM »
I've heard certain gases can cause yellowing too, got a disused bricked up fireplace with a plastic air vent covering it that's gone that colour even though it's behind a cabinet away from light.

Offline Bradselph

  • High Voltage Enthusiast
  • *
  • Posts: 16
  • Karma: +1/-0
    • View Profile
Re: Effect of UV radiation on white PVC
« Reply #4 on: May 03, 2020, 10:06:08 PM »
i could see heat doing that as well not just gases

High Voltage Forum

Re: Effect of UV radiation on white PVC
« Reply #4 on: May 03, 2020, 10:06:08 PM »

 


* Recent Topics and Posts

post Re: Capacitor testing
[Voltage Multipliers]
johnf
Today at 09:33:01 AM
post Re: UD2.7 GDT problem
[Dual Resonant Solid State Tesla coils (DRSSTC)]
endi007
Today at 08:46:23 AM
post Re: UD2.7 GDT problem
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
Today at 08:10:02 AM
post Re: CT current phase leading by 60°
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
Today at 08:03:04 AM
post Re: UD2.7 GDT problem
[Dual Resonant Solid State Tesla coils (DRSSTC)]
endi007
Today at 07:41:29 AM
post Re: Capacitor testing
[Voltage Multipliers]
MRMILSTAR
Today at 05:42:57 AM
post Capacitor testing
[Voltage Multipliers]
abstruse1
Today at 05:02:21 AM
post CT current phase leading by 60°
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Karl Fischer
August 04, 2021, 11:46:10 PM
post IGBT Desaturation Detector
[Electronic Circuits]
TMaxElectronics
August 04, 2021, 06:03:32 PM
post Re: VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
johnnyzoo
August 04, 2021, 11:03:33 AM
post UD2.7 GDT problem
[Dual Resonant Solid State Tesla coils (DRSSTC)]
endi007
August 04, 2021, 09:18:03 AM
post Re: VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
August 03, 2021, 08:59:22 PM
post Re: VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
MrScrOggs
August 03, 2021, 06:41:57 PM
post Re: Flyback secondary burnout
[Voltage Multipliers]
johnnyzoo
August 03, 2021, 06:31:34 PM
post Re: VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
johnnyzoo
August 03, 2021, 06:16:50 PM
post Re: VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
MrScrOggs
August 03, 2021, 04:29:02 PM
post Motorcycle Music
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Transgarp
August 03, 2021, 01:50:26 PM
post Re: Up to 9 half-bridges of FS35R12 IGBTs in parallel, per board...
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Da_Stier
August 03, 2021, 10:35:58 AM
post Re: Up to 9 half-bridges of FS35R12 IGBTs in parallel, per board...
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
August 03, 2021, 07:55:07 AM
post Re: VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
August 02, 2021, 10:40:00 PM
post Re: VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
Mads Barnkob
August 02, 2021, 09:06:52 PM
post Re: VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
SalinsLV
August 02, 2021, 08:34:06 PM
post Flyback secondary burnout
[Voltage Multipliers]
abstruse1
August 02, 2021, 05:47:02 PM
post Re: VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
Mads Barnkob
August 02, 2021, 08:07:25 AM
post Re: VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
August 02, 2021, 05:44:35 AM
post VTTC Arcs From Feedback Coil
[Vacuum Tube Tesla Coils (VTTC)]
MrScrOggs
August 01, 2021, 09:16:20 PM
post Re: UD2.7C and news coil 150khz 70cm
[Dual Resonant Solid State Tesla coils (DRSSTC)]
JCF
August 01, 2021, 03:57:42 PM
post Re: UD2.7C and news coil 150khz
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hydron
August 01, 2021, 02:10:03 PM
post UD2.7C and news coil 150khz 70cm
[Dual Resonant Solid State Tesla coils (DRSSTC)]
JCF
August 01, 2021, 12:06:46 PM
post Re: Teardown of Kathrein 1800/900 MHz Antenna For Mobile Phone Base Station
[Radio Frequency]
Da_Stier
July 31, 2021, 09:23:10 PM
post Re: Teardown of Kathrein 1800/900 MHz Antenna For Mobile Phone Base Station
[Radio Frequency]
Mads Barnkob
July 31, 2021, 08:52:44 PM
post Re: Teardown of Kathrein 1800/900 MHz Antenna For Mobile Phone Base Station
[Radio Frequency]
Da_Stier
July 31, 2021, 01:23:07 PM
post Re: CW Help -- too much info to digest
[Voltage Multipliers]
abstruse1
July 31, 2021, 03:15:04 AM
post Re: What is BPS?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Felix B.
July 30, 2021, 11:53:25 PM
post Re: Teardown of Kathrein 1800/900 MHz Antenna For Mobile Phone Base Station
[Radio Frequency]
Da_Stier
July 30, 2021, 09:11:33 PM
post Re: What is BPS?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
July 30, 2021, 08:16:05 PM
post Re: My X-Ray Machine
[X-ray]
neukyhm
July 30, 2021, 06:42:54 PM
post Teardown of Kathrein 1800/900 MHz Antenna For Mobile Phone Base Station
[Radio Frequency]
Mads Barnkob
July 30, 2021, 02:42:24 PM
post Re: Toslink eagle library (FCR6842031R)
[Printed Circuit Board]
Da_Stier
July 30, 2021, 11:44:23 AM
post Re: What is BPS?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
PEDRO HENRIQUE
July 30, 2021, 06:16:06 AM
post Re: CW Help -- too much info to digest
[Voltage Multipliers]
davekni
July 30, 2021, 04:57:44 AM
post Re: Need second opinion on tesla coil capacitors
[Spark Gap Tesla Coils (SGTC)]
davekni
July 30, 2021, 04:45:12 AM
post Re: CW Help -- too much info to digest
[Voltage Multipliers]
abstruse1
July 30, 2021, 03:37:44 AM
post Re: Toslink eagle library (FCR6842031R)
[Printed Circuit Board]
Twospoons
July 30, 2021, 12:08:11 AM
post Toslink eagle library (FCR6842031R)
[Printed Circuit Board]
br0
July 29, 2021, 09:35:45 PM
post Re: CW Help -- too much info to digest
[Voltage Multipliers]
MRMILSTAR
July 29, 2021, 05:16:39 AM
post Re: CW Help -- too much info to digest
[Voltage Multipliers]
abstruse1
July 29, 2021, 03:38:23 AM
post Re: Grounding VTTC
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
July 28, 2021, 08:31:50 PM
post Re: Grounding VTTC
[Vacuum Tube Tesla Coils (VTTC)]
SalinsLV
July 28, 2021, 08:07:10 PM
post Re: Tesla Coil Music
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Max
July 28, 2021, 05:17:06 PM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal