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Registered Member #1083
Joined: Mon Oct 29 2007, 06:16PM
Location: Upland, California
Posts: 256
I just found out that the silver/grayish anti-static packaging is actually two sheets of polyethylene with the inside of each being metalized. I took my NST and brought it up to the edges of a sheet, and before a full, hot arc could establish itself, the inside metal layer flashed away. Anyways, my question is this. Would it be feasible to use this film to make my own metalized polyethylene hv capacitors? It would be an awesome thing to be able to do, because it would be similar to the CDE942 series self healing capacitors. If the pe arcs through, the foil will vanish before an arc can fully establish itself and create a carbon track in the dielectric.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
I thought the anti-static plastic is supposed to be conductive to do its work, so I am somewhat surprised. I see a few problems though: How are you going to etch away the metal around the edges to avoid flash-over? How are you going to make contacts to the metal, can you actually split the two layers apart? I am also worried that the metal film might be quite resistive, severely limiting the current capability.
Actually you may want to check out this thread about making capacitors, even though it is slightly unrelated. It describes several more or less successful attempts of constructing HV capacitors from overhead transparencies and household aluminium foil.
Registered Member #1339
Joined: Wed Feb 20 2008, 04:43PM
Location:
Posts: 9
Funny thing about those antistatic bags Dr, We tested 3 different kinds with a high voltage leakage tester (<1 Gigohm range) and not one of them were conductive. I tried pearcing them with needles and still no conductance...
The older black bags were conductive though and some of the black foam is also, not the pink stuff though...
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
The silver-gray anti-static bags are constructed as Andyman described, with an inner conductive layer. This type of bag functions as a Faraday cage, and neither the inner or outer surfaces are supposed to be conductive. Some of the other common anti-static packaging ("pink poly", and the black polyethylene film) and not really "conductive", and have a low enough surface resistivity to slowly bleed off a static charge, but a high enough resistivity to limit current from an ESD event to a few microamperes.
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Metallized film
