Conversation so far:
when did the new 5 pound come out
The polymer Bank of England £5 note was introduced on 13 September 2016.
why did the bank of england switch to polymer for the 5 pound note
The Bank of England cited that the polymer £5 note would be cleaner, more secure and more durable.

Question: which country used polymer first
Self-contained rewrite: which country first used polymer for currency