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I'd be so curious for them to test high- and low-density polyethylene.

This is a great question to ask. If you look at the GRAS list, some molecular weights of PEG are GRAS while others are not. There’s no reason to think other polymers should be different.

GRAS is “Generally Recognized As Safe”: so for example you don’t need to do a study on its safety when using it in a drug formulation.

Yeah HDPE is/was generally recognized as safe.

In America, most milk comes in HDPE jugs unless you opt for the glass bottles (much more expensive), or paper cartons (PFAS lining concerns).

https://en.wikipedia.org/wiki/Plastic_milk_container

So one would hope HDPE is still GRAS (i.e. there should be a focused study on LD/HD PE).

FWIW I could not find it in the SCOGS database. I don’t know what the food packaging rules are (I only worked on the pharma side)

Thanks for looking into it!

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