1. The cup that can be put into the microwave oven is high borosilicate glass or porcelain cup, because borosilicate glass is a special glass material with low expansion rate, high temperature resistance, high strength, high hardness, high light transmittance and high chemical stability, and its thermal expansion coefficient is 3.3×10-6/k.

2. There are also metal utensils that can't be put into the microwave oven, because the utensils such as iron, aluminum, stainless steel and enamel put into the oven will generate electric sparks when heated in the microwave oven, reflecting microwaves, which will not only damage the furnace body but also heat food, which is easy to cause blasting accidents.