Reaction of Salt to Unknown Plastic Container

I was going to eat balut. I got pinches of salt and placed it on saucer. Then… It was a coincidence, I placed the open jar near my nose. The smell was disagreeable. Seems the smell of melting plastic.

salt and spoon in plastic jarHere are the other details.

It is a clear plastic jar with a yellow plastic screw cap. It is a brittle packaging. It’s the common packaging of Baguio’s peanut brittle. No recycling symbol embossed on both clear container and cap so its identity is unknown. Maybe it is a recycled plastic not fit for food applications.

We have been using the plastic jar for several years. A disposable plastic spoon is in the jar as permanent tool for getting salt.

I noticed the putrid aroma only after several years. It’s time to get a replacement jar and I will never get a jar of the same type. A glass or a polypropylene jar will do.

This is the first time I encountered salt affecting plastic containers. I tried searching around the web for answers. Never found any though. Maybe salt really reacted to plastic or to disposable plastic spoon alone after several years of contact.

This jar and the plastic jars of popular water sticks have the same appearance and texture, both clear and brittle. The latter has recycling code number 3, PVC. Maybe the first is polyvinyl chloride too. See “Wafer Sticks in PVC container“. If the first is a real PVC then the “chloride” words in both names make sense.

The two common food to container reactions. Metals such as tin and aluminum to acid foods and oily products to polystyrene polymers,”What if Tin Can and Aluminum Can Have No Lacquer Coatings?” and “Migration of Styropor to Food


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