Will our standard fire safes protect the new Polymer £5 notes?

The new Polymer £5 note was issued on 13 September 2016 and a new £10 note will be issued in summer 2017 and the £20 note by 2020.

 The Bank Of England tells us that the Polymer banknotes are cleaner, more secure, and more durable than paper banknotes. They will provide enhanced counterfeit resilience, and increase the quality of banknotes in circulation.
But, will our standard fire safes still protect them in the case of a fire?
Phoenix Safe Company, where peace of mind is guaranteed
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