Generally speaking, paper packaging boxes such as pure paper, kraft paper, and parchment paper can be heated in a microwave because they do not contain metallic substances and will not interfere with the microwave. White paper towels, paper trays, and other paper products made from pure wood pulp can also be safely placed in the microwave.

However, not all paper packaging is suitable for microwave heating. Some packaging paper, colored printing paper, and certain glossy packaging materials containing metal foil or metal particles are not suitable for microwave ovens because the metal parts may cause sparks, damage to the microwave oven, and even fire. In addition, paper packaging with ink may also catch fire during the heating process.

Therefore, when using paper packaging to heat food, it is important to ensure that they do not contain any metals or other unsafe ingredients, and to observe the situation inside the microwave to prevent accidents. If paper packaging is not suitable for microwave heating, it is recommended to transfer the food to a container suitable for microwave heating before heating.