Why are you using plastic to make pill box? What others material to make the plastic box?
Most of plastic aren't safe for store the high temperature item, so we use PP, PS, ABS to make the pill box. Making a container for something like supplement and pills, which is low temperature but still need to keep them from metamorphism. Plastic is light, low cost and stable for supplement container.
We have some items are made by HIPS, AS, MS. We can analysis your requirement to find the best material to build the item.