Can the disposable lunch box be heated?

Microwave lunch boxes are usually made of PP and PS plastics. PP refers to polypropylene, which has excellent mechanical properties and thermal properties, and is used in various performance laminated materials and packaging materials. And PS is commonly known as hard glue, ordinary hard glue, hard and brittle, when knocked, it makes a metal-like “jingle” sound, and the sound is crisp, commonly known as “sound glue”, non-toxic and tasteless.
Disposable lunch box

The above two materials are safe to be heated in a microwave oven and will not release toxic substances. It should be noted that general lunch boxes are marked whether they are suitable for use in microwave ovens. Some lunch boxes are made of non-PP lids, so they cannot be heated in a microwave oven. When eating, do not take the lid on.

If it is a plastic lunch box that is neither marked with material nor “suitable for microwave ovens” and similar content, it cannot be heated in a microwave oven. Such a lunch box may be a low-quality lunch box and should not be used in a microwave oven. It can be said that as long as the outer casing is non-conductive, all utensils can be used as disposable lunch boxes. Generally speaking, as long as there are no metal utensils, such as disposable lunch boxes, foam plastics, paper products, and instant noodle bowls, all can be heated. Disposable lunch boxes can be heated in a microwave oven, but do not heat them in this way. Disposable lunch boxes will release harmful substances when heated in a microwave oven, and frequent use will cause physical damage.
Most disposable tableware, whether it will melt or not, should not be heated. Some disposable lunch boxes can be heated. Although there are disposable lunch boxes made purely for heating, it is difficult for us to judge whether they can be heated. Therefore, I personally think that as long as there is no mark on the lunch box that it can be heated, it will be considered non-heatable by default.