What kind of lunch box can be heated in a microwave oven?

Update:27 Jul 2020
Summary:

There are two types of food containers heated by microw […]

There are two types of food containers heated by microwave ovens: ceramics and plastics. Now such containers sold in the domestic market, whether ceramic or plastic, are almost all marked with "microwave oven applicable". In fact, the microwave performance and quality of these products vary greatly. Taking ceramics as an example, ceramic food containers used for microwave heating should have higher requirements than national standards. Because the main raw material of ceramics is clay whose chemical composition is aluminosilicate. High-quality kaolin has stable performance after high temperature sintering, is non-toxic, and has low microwave dielectric loss. It is an ideal container for microwave ovens. Inferior kaolin is mixed with various metal impurities. In order to reduce costs and facilitate processing, some companies add iron, lead, cadmium and other compounds, so that the microwave loss of the container will increase and the temperature will rise easily. When heated in a microwave oven, these metals will precipitate out in a small amount, endangering health or cause chronic poisoning. The colorful glaze on porcelain contains oxides such as lead, mercury, cadmium, tin, etc., which is a health killer after heating.

For plastic containers, the container made of polyethylene (PE) has stable chemical properties in the range of -20°C to 120°C, low microwave loss, and non-toxicity. It is the ideal first choice for microwave oven. The container (including film) made of polypropylene (PP) has slightly greater microwave loss than polyethylene, and is also a better microwave container. PP plastic products can work for a long time at 100°C. When there is no external force, PP products will not deform when heated to 150°C. As for polyvinyl chloride (PVC), polyester and polycarbonate (PC), foam plastic boxes, inferior plastic wrap, disposable lunch boxes, and all kinds of recycled plastics, and even inferior containers processed from waste materials, they should be resolutely eliminated Microwave oven.

It is more important to note that in the actual process of making polycarbonate (PC), a small part of the raw material bisphenol A is not completely converted into plastic, and it will be released into food when heated, which will affect the developing fetus. And children are harmful.

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