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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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23rd May 2019, 10:41 pm | #21 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,580
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Re: Cable that 'melts' paint in storage
Hi.
This is an interesting thread. I've also seen cases of an 'impression' made in the painted finish of metal cabinets that have had PVC mains leads left draped over them. My bungalow's wall insulation comprises polystyrene balls, which I'm told should have had a binding agent applied when they were injected into the wall cavity. It's evident, that in the loft space around the top of the wall cavities, there's a build up of the polystyrene balls. The PVC mains wiring appeared to be covered by them in a number of places and some have stuck to the cables. I spent considerable time cleaning up the polystyrene balls after finding out the potentially dangerous effect of damaged wiring. I also came across a similar effect where a latex glove had been left on a lacquered painting. The lacquer had been stripped off in the area of contact. Regarding clear lacquer. It's not always compatible with some plastics. I tried an experiment by painting a PVC radio handle with a water based acrylic paint and it dried perfectly well but was a matt finish. Spraying with an acrylic clear lacquer, probably with xylene resulted in a good finish. The problem is, there's some kind of adverse reaction as the handle is permanently sticky. It's most likely due to a reaction with the PVC handle. That was not an isolated case as something very similar happened several years ago. I think I mentioned somewhere in another thread, the 3-core mains lead on my Philips TVette gave off an awful smell. That was chucked out and a new lead fitted. I remember back in the early 1970s we had some Christmas tree lights that had a similar pong coming from the wiring. Perhaps the outgassing becomes worse with age on some cables. There was an elastic band around the TVette's lead which had perished and the goo was stuck to the cable. So it seems concerning the possible interactions between PVC and paints, polystyrene etc. That's sensible advice to store the PVC lead in a polythene bag to avoid any trouble. Would it be advisable if the bag was vented or completely sealed. In the latter case any outgassing will build up within the bag which might be a problem. Any views on this? Regards, Symon Last edited by Philips210; 23rd May 2019 at 10:53 pm. Reason: typo |
24th May 2019, 10:02 am | #22 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
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Re: Cable that 'melts' paint in storage
I wasn't expecting any response to this but it is interesting to see so many have experienced the same little known problem.
Here we are rewiring our vintage radio with PVC covered wire and cursing the rubber wire that has only lasted 70 years! |
31st May 2019, 8:06 pm | #23 |
Pentode
Join Date: Dec 2017
Location: Huddersfield, West Yorkshire, UK.
Posts: 193
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Re: Cable that 'melts' paint in storage
I had some of that sort of padded rubbery mesh stuff that was sold as non slip so I put some on top of my big crt tv (32" widescreen Panasonic) and put stuff on top months later I took it off to find mesh pattern melted into the top of the tv
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31st May 2019, 10:27 pm | #24 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,580
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Re: Cable that 'melts' paint in storage
Hi
I've also found the 'rubber' feet on some equipment can leave a residue on the item stacked underneath. I have found card/cardboard is good when stacking stored equipment. I use old unfolded Shredded Wheat/Cornflakes boxes for placing between appliances and have so far not had any problems. Regards, Symon |
4th Jun 2019, 7:21 am | #25 | |
Nonode
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
Posts: 2,301
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Re: Cable that 'melts' paint in storage
Quote:
Peter |
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20th Jun 2019, 11:15 pm | #26 |
Pentode
Join Date: Jun 2015
Location: Wellington - New Zealand
Posts: 112
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Re: Cable that 'melts' paint in storage
I have encountered plenty of appliances and electronic items with black plastic cases where the mains cord has been wrapped around them (for storage) and upon removal the plastic casing has 'melt' marks in it where the cord has been resting against it.
These marks are similar to the sort of thing you'd see if someone had carefully rested a soldering iron on the plastic for a few second. Not deep, but significant enough to destroy the surface. |
21st Jun 2019, 8:00 am | #27 |
Heptode
Join Date: May 2014
Location: Salisbury, Wiltshire, UK.
Posts: 998
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Re: Cable that 'melts' paint in storage
Like CDs you mean..."ever" has been misappropriated!
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David, G4YVM. |
21st Jun 2019, 9:04 am | #28 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,108
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Re: Cable that 'melts' paint in storage
Yes. CD's and DVD's, apparently, can be given the Van Helsing treatment by being left in strong sunlight. Today seems like a good day to experiment- just need to find one that I don't like.
I certainly wasn't aware of the DEHP issue. Plastic that attacks its creator. It's darkly ironic that a reduction in male fertility might actually extend the useful life of the planet. Dave |
27th Jun 2019, 10:44 pm | #29 |
Dekatron
Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 5,274
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Re: Cable that 'melts' paint in storage
I had an annoying effect the other day. couple of years ago, inspired by Panrock's lacquering of a TV, I refinished a 30's radio in aerosol clear lacquer. I printed the circuit diagram out on 2 sheets of A4 and stuck them together with sellotape. The diagram has since lived, folded in half, on top of the radio in my bedroom. You know what's coming..the other day i moved the diagram and the sellotape (not the sticky side!) had dissolved a stripe all along the top of my gleaming walnut cabinet. I suppose it adds an authentic patina
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Kevin |