"food-grade rubber"
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And asbestos could be added too!
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OMG! I googled it!

Food grade rubber is a specially certified grade of rubber approved for use in food manufacturing and packaging. ... odourless and tasteless...It is a tough and reliable material with a long life span. - Show replies
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“food-grade” rubber?
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Like mom used to make.
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Food Grade Rubber Pieces?
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