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What was the silver disk inside the cardboard pot pie box that caused crust brow - lzewaoSew - 01-16-2020 What was the silver disk inside the cardboard pot pie box that caused crust browning in the microwave oven?These things are called microwave susceptorsThey are made up of a material (typically a metal like aluminum flakes) that strongly absorbs microwave radiationThis materials is embedded in a heat-resistant polymer and coated as a thin film on a part of the packaging Do a search for microwave susceptor on your favorite search engine and you\'ll get lots of hits from manufacturers of these things.Other related question aluminum sheet aluminum products aluminum plate alloys aluminum aluminium strips aluminum strips aluminum strip aluminum foil aluminum supplier