To my knowledge Hypalon is a proprietary material of Avon. Avon would have been my choice for a life raft anyway. I have a 1978 Avon Redcrest 8-ft dinghy that still holds air and still works great. I would swear by them and yes, stake my life on them.
(I do not care for Zodiac for a number of reasons even though the US gov't supposedly uses them. Avon is Royal-Navy spec.-- in fact, they were made FOR the Royal Navy before they became available to the public.)
You might to some research into what kinds of LRs have been involved in some of the longest-term and worst-case scenarios at sea. I believe the family who accidentally rammed a whale in the 1980s, whose boat went down in about 90 seconds, causing them to stay in liferafts and dinghies for 119 days, had Avons. Look and see.