bisphenol A
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Flexible
type 3 plastics may leak bisphenol A
"In general, plastics that are marked with recycle codes 1, 2, 4, 5, and 6 are very unlikely to contain BPA. Some, but not all, plastics that are marked with recycle codes 3 or 7 may be made with BPA."
[27]
There are
seven classes of plastics used in packaging applications. Type 7 is the catch-all "other" class, and some type 7 plastics, such as
polycarbonate (sometimes identified with the letters "PC" near the
recycling symbol) and epoxy resins, are made from bisphenol A monomer.
[5][28]
Type 3 (
PVC) can also contain bisphenol A as an antioxidant in
plasticizers.
[5] This is particularly true for "flexible PVC", but not true for PVC pipes.