I've been in correspondence with Campbell's Soup about the plastic lids on their microwavable soups. I noticed there is no recycle label marked on these and wondered why. The bowls are marked as recyclable but the lids have no marking. Here's wheat they told me: "The lid is #5 plastic (polypropylene). While some municipalities do
accept #5 plastics for recycling, most do not. Our packaging engineers
have specifically looked at ways to make these lids more recyclable, but
unfortunately there are some very specific consumer performance
requirements (dimensional stability in the microwave) that dictate that
we use polypropylene today."
Are there alternatives to #5 plastic that would work as lids for microwavable soups?
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