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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all.
Just had an idea, could water glass (aka sodium silicate) be used to insulate say a cardboard secondary former to use it for high voltage applications?
This would be particularly useful as it has a surface consistency similar to glass, yet chemically identical. It does have some sodium ions present but this isn't likely to be as big a problem as usual.
Tried it with a piece of copper and EL phosphor, which glows as bright as usual under UV once the water glass has cured with mild heating < 70C for a few hours.
Comments? (plus its a heck of a lot cheaper than Epoxy and substantially less toxic)
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
As stated, when dry, it should work well. Just watch out for surface tracking. While glass doesn't conduct, it allows surface tracking easier than say, a plastic or film dielectric.
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
radiotech wrote ...
I have some glass pH probes Do they conduct?
Yes, but probably very badly. I don't know about water glass, but fire cement is a fairly good insulator and the binder in it is sodium silicate. However, be warned, when it gets hot it conducts quite well (like ordinary glass), which could lead to thermal runaway.
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Does a sodium silicate solution naturally produce a continuous polycrystalline film during dehydration? If it creates flakes or scales it won't be much use obviously.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Pinky's Brain wrote ...
Does a sodium silicate solution naturally produce a continuous polycrystalline film during dehydration? If it creates flakes or scales it won't be much use obviously.
The exact properties of a sodium silicate glass depend on its SiO2/Na2O ratio, but all are polymeric and water-soluble.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
hm.. So I'd need to insulate it with Epoxy as well. Still, an interesting experiment to try as putting it between two sheets of real glass then insulating the edges could work well for all sorts of applications.
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