Plastic lunch boxes Disposable lunch boxes made of plastic are mainly PP polypropylene and PS polystyrene. They are both non-toxic, odorless and odorless. PP is relatively soft. The general PP temperature is -6 degrees to +120 degrees , So it is especially suitable for holding hot meals and hot dishes. It can be heated in a microwave oven or even cooked in a steam cabinet. The use temperature of modified PP can be controlled at -18 degrees to +110 degrees. In addition to being heated to 100 degrees, it can also be used in the refrigerator for refrigeration.
PS is hard and transparent, but it is easy to tear. PS starts to soften when the use temperature reaches 75 degrees, so it is not suitable for holding hot meals and hot dishes, but PS has good low temperature performance and is the best packaging material for ice cream.
In order to reduce costs, some lunch box factories use PP as the box and PS as the lid. The advantage is that the lid is transparent and the PS is harder. It can be made of thinner materials to reduce costs, but consumers of this design must understand the two materials The difference, do n’t put the whole box of lunch together with the lid and heat it in the microwave.