In message ,
writes
On Sunday, 4 October 2020 15:55:41 UTC+1, Ian Jackson wrote:


I don't think that plastic milk bottles are designed to
self-destruct in the short-term.

plastics don't last very well. I'd guess milk bottles are some sort of
PE, which is not one of the longer lived plastics.

A quick Google reveals that milk bottle are HDPE - and that it is pretty
long-lived if kept out of the sunlight.

https://www.google.co.uk/search?q=Ho...to+decompose%3
F&sa=X&ved=2ahUKEwiJwLyA1JvsAhVDURUIHVa4BbwQzmd6BA gaEAU&biw=832&bih=500

--
Ian