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Question from M Carter

Hi Debra,

I use hermetic glass jars with glass lids to store dry goods in the pantry. The seal on these is vulcanized rubber. Is there anything to be concerned about with the vulcanized rubber—it doesn’t actually touch the food, but I have to touch it to open and close it, and I also wasn’t sure about offgassing. I was also looking at some shoes with vulcanized rubber soles, and wondering if that would be a safe shoe material. Thank you!

Debra’s Answer

Vulcanized rubber is natural latex rubber heated with sulfur. It’s used to make everything from seals on glass jars to rubber bands to automobile tires.

Here’s an article from the Centers for Disease Control about the health effects of vulcanized rubber:
http://www.cdc.gov/niosh/docs/93-106/

I don’t use products made out of recycled rubber tires, but I do use glass jars with seals and rubber bands and don’t consider those to be major sources of toxic exposure.

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