What kind of material is this cooktop made of?

glass
ceramic
platic
glass-ceramic
Glass-ceramic materials share many properties with both non-crystalline glass and crystalline ceramics. The negative thermal expansion of the crystalline ceramic phase can be balanced with the positive expansion of the glassy phase. At a certain point (~70% crystalline) the glass-ceramic has a net expansion near zero and can sustain repeated and quick temperature changes up to 1000 °C.
Bob Stanley
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Correct this question
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Very interesting!
reach: rather globalceramicchemistrycuisineglassmaterialsphysicstechnologytemperature

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glass
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glass-ceramic
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350
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30
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56
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11%
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27
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35%
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42%
14