What happens to pp when it is exposed to heat?

2018-09-29View Original

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I came across an example where the sealing lid was made of food-grade PP plastic. After being exposed to hot water for some time, the lid became filled with steam. At that point, I noticed faint colored marks on the lid. As far as I know, food-grade PP is typically made from pure PP, with no additives or only trace amounts of them added. Moreover, the temperature of the hot water wasn’t very high, around 70-80 degrees. Could these colored marks be caused by some substance that has precipitated out of the PP? What could it be? Let’s discuss this together

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What happens to pp when it is exposed to heat?

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