I have been pulling a tanker for a couple of years and I often carry a chemical called tetrapotasium pyrophosphate. It is used as an additve to cement, concrete, and rubber among other things.
I have also hauled this hazmat placarded product to plants that MANUFACTURE FOOD PRODUCTS!!
It also is used in food grade products toothpaste, marshmallows, frozen food and chicken nuggets!! Of course it is not in its pure form. I was suprised when one of the loaders was telling me it can be used so many ways.
It requires corrosive placards to haul!!
A while back I hauled an Inhalation hazard placarded load to a place that made cough syrup.
I am sure some of you tanker yankers have hauled hazmat loads to food places before.