Secondary use for that pressure cooker

[Fidel. MD]

I have my doubts .... with the gasket in place, a pressure cooker is most certainly is not EMP proof ..... without the gasket the "fit" between the body & lid is sloppy and that twist turn locking feature of a pressur cooker is totally gone ..... I'll stick to the various size military ammo boxes myself ......

OK. And what about the rubber gasket that the box actually fits into on the lids? Same problem as with the gasket in the pressure cooker.

[egore]

I have my doubts .... with the gasket in place, a pressure cooker is most certainly isn't EMP proof ..... without the gasket the "fit" between the body & lid is sloppy and that twist turn locking feature of a pressure cooker is totally gone ..... I'll stick to the various size military ammo boxes myself ......

The big pressure cookers don't have a gasket unlike the ammo cans you are using. They use a turned taper in the top and bottom with a little grease on it. Can't do much canning in a little presto.

[d0nju4n]

I have my doubts .... with the gasket in place, a pressure cooker is most certainly isn't EMP proof ..... without the gasket the "fit" between the body & lid is sloppy and that twist turn locking feature of a pressure cooker is totally gone ..... I'll stick to the various size military ammo boxes myself ......

so? The screen in the door of your microwave has small holes in it, yet it still blocks the radiation. You can make even make a Faraday cage w/ copper mesh. The size of the gaps/holes in the conductor is determined by the wavelength you want to block, but that's about it.

Take my posts on this w/ a grain of salt; I'm only an electrical engineer.

[Ldsparamedic]

All American pressure cookers do not have a gasket. They have a machined metal to metal fit which is so tight, it will hold in steam under pressure. Will this not work? Doc Fidel, what shape makes the best Faraday cage?

[Fidel. MD]

Any shape will do, as long as the electromagnetic energy stays OUT.

[Tealcat95]

Alright so help me out here ya'll- If I have a standard metal trash can and completely line the inside and lid areas with ??? (cardboard, foamrubber) and then put my extra batteries, flashlights, solar radios etc in it then when the EMP waves hit it will not affect the stuff inside???

[driftz240]

horrible idea....then youll have no deep fried goodness from now on....hi price to pay for emp protection...deep fried chicken sandwich ftw...lol actually your a smart cookie egore. props on the idea

[d0nju4n]

Alright so help me out here ya'll- If I have a standard metal trash can and completely line the inside and lid areas with ??? (cardboard, foamrubber) and then put my extra batteries, flashlights, solar radios etc in it then when the EMP waves hit it will not affect the stuff inside???

Right idea, but not quite. When we start talking about shielding using other metals, the electrical conductivity of the metal comes into play. I believe that copper's conductivity is an order of magnitude greater than the steel in your trashcan. This is important, and is why copper is used. Silver is actually more conductive than copper, but we don't use that for obvious reasons. There is also an electromagnetic phenomenon called the "skin effect". In general, metals have a property called "skin depth", which determines how much radiation will penetrate a shield of a given thickness at a given frequency. This is what you need to consider when trying to come up w/ a Faraday cage design.