Microwave popcorn is a convenience food consisting of unpopped popcorn in an enhanced, sealed paper bag intended to be heated in a microwave oven. In addition to the dried corn the bags typically contain cooking oil with sufficient saturated fat to solidify at room temperature, one or more seasonings (often salt), and natural or artificial flavorings or both. With the many different flavors, there are many different providers.
The design of a microwave popcorn bag is specifically keyed to avoid popped kernel scorching, an undesirable effect that takes place when popped kernels are heated above 300 °F (149 °C).
A susceptor, usually a metalized film laminated onto the paper of the bag, absorbs microwaves and concentrates heat at the film interface, thus ensuring a heat distribution focused on the hard-to-heat flavor coating so that the unpopped kernels are evenly coated prior to popping, thereby ensuring even flavor throughout the product. Additionally some popcorn is flawed and will not pop because of possible damage to the shell which allows the steam to escape. These unpopped kernels are known as "old maids" or "spinsters".
It is possible to heat popcorn in the microwave using simple paper bags, or popping the popcorn in the microwave in other containers including large glass bowls with heavy, but not airtight glass lids. These homemade approaches allow greater control over flavoring and exposure to PFOA, but have a chance of leaving some corn kernels unpopped due to randomness of the microwave radiation distribution in a microwave.
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- "Microwave Popcorn: Home made, cheap and easy".