I have some thin Corning Ware plates (from the local thrift store) I use in the microwave, which I have used two times in the last month. They are basically Pyrex made by Corning in upstate NY. Same people who came up with Gorilla Glass for phones. I never use plastic in the microwave.
Remember how takeout hot coffee came in Styrofoam cups? How disgusting. I never drank a drop of that.
Thin Corelle plates aka Corning Ware. Great for microwave. Time Period Manufactured:
1970-1979