so long as they don't get too hot or in too acidic or basic of a chemical environment.
Isn't this also true of carbon-based proteins (usually what membranes and catalysts are made of)?
There was a rather large field campaign called The Severe Thunderstorm Electrification and Precipitation Study (STEPS) to study electrification done around the year 2000 that involved the use of polarimetric weather radar to observe electrified storms, in conjunction with the New Mexico Tech Lightning Monitoring Array (LMA).
One of the nice things about polarimetric radar is the ability to measure the aggregate orientation of particles, including ice crystals. When scanning active electrified storms, the radars observed polarimetric signatures indicating increased vertical orientation of particles aloft (ice crystals), which then suddenly snapped back to roughly random orientation. This event corresponded well with measurements from the LMA. In other words, they could, using radar, predict lightning strikes. I love science!
Perfect anything is impossible to achieve when dealing with microwave devices, in my opinion. Particularly shielding - you can reduce it down to a point, and it gets expensive the lower you go. For instance, "quiet chambers" used when testing for EMI compliance typically have doors with beryllium-copper fingers that try to create a faraday shield to keep out external interference. I've never seen any commercial microwave oven that uses these - for good reason too, since they're expensive and won't last very long in a kitchen environment.
Most microwaves would try to ensure that the gap between the metal door and the body is small enough that the waveguide thus formed would have significant attenuation at 2.45 GHz. Any waveguide has a "cutoff" frequency, below which propagation can only occur through evanescent waves, which decay very rapidly. However, the relative power levels involved (microwaves generate 1 kW, or about 60 dBm, while WiFi receivers are sensitive down to about -90 dBm, or 1 picowatt) means that evanescent waves that escape can cause interference.
"Money is the root of all money." -- the moving finger