． Be sure to pay attention to the applicable temperature of lunch boxes made of different materials. PP lunch boxes have better heat resistance and are suitable for holding hot meals and hot dishes. PS lunch boxes are more fragile and will begin to soften when the temperature reaches 75℃, so make sure the food has cooled to room temperature before using. In addition, try to avoid directly heating food in the Микровълнова заедно с PS кутии за обяд, тъй като те имат отлична работа с ниска температура и са по-подходящи за държане на хладилна храна .
． The compatibility of food ingredients and lunch boxes must also be considered. Foods with high fat and high sugar content should not be put into lunch boxes because the boiling point of oil may exceed the heat resistance limit of plastic. At the same time, chemical substances such as oil and sugar in food and plasticizers in lunch boxes may undergo chemical reactions under the principle of like dissolves like, posing a potential threat to Обществено здраве и безопасност на храните .