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What about disposable plastic fast food boxes

It is understood that plastic disposable fast food boxes are mainly PP polypropylene and PS polystyrene, which are non-toxic and tasteless. The PP material is relatively soft. Generally, the temperature of PP is -6 degrees to +120 degrees, so it is particularly 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 from -18 degrees to +110 degrees. In addition to the use of this kind of PP, the disposable fast food box can be heated to 100 degrees and can also be placed in the refrigerator for refrigeration.
 
PS is hard, and although it has high transparency, it is easy to tear. PS begins to soften when the use temperature reaches 75 degrees, so the disposable fast food box made of PS is not suitable for holding hot meals and hot dishes, but the low temperature performance of PS is very good, and it is a good packaging material for ice cream.
 
In order to reduce costs, some disposable fast food boxes 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 both The difference in materials, remember not to put the whole box of lunch with lid in the microwave.