I've borrowed The Whole House Book: Ecological Building Design and Materials (Amazon link) from our little college library, and got interested in the section on plastics.
Here's a good summary of what the "recycling" of plastics really means. Apparently PET bottles can actually be turned back into bottles - but this doesn't usually happen. Also, PET microwavable food trays are "physically and chemically different from PET bottles" - here. And that the trays are useless. So now I understand why they ask for plastic bottles only, not anything made from PET/recycling symbol 1 on.
What a mess.
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