I don't believe any metal is safe in a microwave.
Microwaves aren't safe, but microwaved food is.
No there is no microwaves that you can put metal in without it catching on fire.
microwaves are metal because metal reflects microwave energy so you get the waves bouncing around the box. The bouncing waves make the food inside the microwaves warm.
The purpose of the metal racks is tohold stuff on that does not need to rotate, and the metal racks are smooth in order not to cause sparks, so unless your metal rack has been damaged it is generally safe to use.
Their are a lot of chemicals in a nuke which makes an explosion on impact because of metal.
No, the metal will reflect the microwaves and damage the magnatron (the part that produces the microwaves).
metal and glass
Put in the combination!
actually, you don't need to worry about exposure to them, as long as you can get out of the way in around five minutes, since microwaves are somewhat weak and can do radioactive harm only when you are exposed to it for quite a while. and today, the microwaves you use usually stop heating the minute you open the door, so that is safe. however, just don't stick any metal, whether it be a metal bar or aluminum foil, ever in the microwave. the distortions on a metal surface conducts the electromagnetic waves from the microwaves and converts them into electricity and heat, and even an fire and explosions are possible.
cheese
metal mesh
One of the things that metal sides do is reflect the microwaves confined to where the food is. There is a body of information that lists the damage that leaking microwaves do to people