Plastic lunch boxes can be heated by microwave oven, but only plastic lunch boxes marked with microwave oven can be put into microwave oven. The lunch box made of polypropylene plastic can withstand the high temperature of 200 degrees and can be heated by microwave oven. Other ordinary plastic lunch boxes, such as take-away boxes and pc lunch boxes, should not be heated in the microwave oven.

It should be noted that ordinary plastic containers, metal containers, porcelain with metal edges and closed containers should not be used in microwave ovens. Ordinary plastic containers are easy to deform when heated by microwave oven, releasing toxic substances, polluting food and endangering human health.

When metal utensils are heated in the microwave oven, it will produce electric sparks to reflect microwaves, which may easily lead to fire hazards. When a sealed container is heated by a microwave oven, the pressure inside the container is generated due to heating, and it is easy to explode if the pressure is too high.

Microwave ovens can be used to heat tableware;

1, glass lunch box

Glass includes borosilicate glass, microcrystalline glass and titanium oxide crystalline glass. Glass has good penetrability, stable physical and chemical properties and high temperature resistance, and is suitable for long-term use in microwave ovens. Glasses and bottles made of ordinary glass are only suitable for short-time heating in microwave oven, about 3 minutes, and they are easy to break if heated for too long.

2, ceramic lunch box

Ceramics are divided into heat-resistant ceramics and ordinary ceramics. Lunch boxes made of heat-resistant ceramics are suitable for long-term use in microwave ovens, while ordinary ceramic lunch boxes can only be used for short-term heating.