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Which kind of disposable lunch box can be heated in microwave oven?

Update:24 Aug 2019
Summary:

There are many kinds of materials and types of disposab […]

There are many kinds of materials and types of disposable lunch boxes, but one of the most concerned questions is what kind of plastic products are suitable for heating in microwave oven?
In fact, to solve this problem, we must first understand these plastic products. In fact, plastic products have seven kinds of plastic label codes. What we usually see is that in the middle of the triangle which is composed of three arrows and represents the cycle, we add the digital label to attach the triangle recovery label to the plastic products, and use the number 1 to the number 1. 7 and English abbreviations refer to the types of plastics used in plastics.
No. 1 plastic can withstand high temperature of 70 C, which is more suitable for mineral water bottles; No. 2 plastic is mainly used for food packaging bags. Of the seven types, only No. 5 is the only one that can be heated in a microwave oven. Its composition is polypropylene, which can withstand high temperature of 130 C. Therefore, when people choose plastic products, as long as they see the "5" sign in the bottom triangle, such plastic products can be heated in the microwave oven, but they still need to choose large brands of plastic products.
Also, if there is no sign on the lid of plastic products, the lid must be removed when heating. When cleaning this kind of plastic, do not use sharp things such as steel wire balls, so as to avoid scratching the plastic surface, there will be harmful substances overflow when heating next time.

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