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Hypalon was the DuPont trademark for chlorosulfonated polyethylene (CSPE) synthetic rubber.

Hypalon was discontinued by DuPont in 2009/10 and is now sold under its slightly different formula and new name "CSM" or Chlorosulfonated Polyethylene Rubber or the remarketed version of the old Hypalon using an additional layer of neoprene (cr) so the new chemical formulation is csm/cr.

As mentioned, NRS now uses Orca fabric coated with chlorosulfonated polyethylene (CP).

Weight and performance differences vary with manufacturer and the base fabric used (denier as well as coating).
 

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There seems to be a tendency to imbue old boat designs, fabrics and coatings with almost mythical properties; but for the latter there has been decades of technological development. So I'd be inclined to give the chemical engineers and raft makers some credit here, because behind the comparable performance aspects we end-users perhaps laud most there are also major considerations/trade-offs in the material sciences regarding durability, degradability, and/or say resistance to UV damage.
I would tend to agree and don't really see the new boat materials as 'hypalon knockoffs' as much as new products developed as technology and health/safety standards have evolved.
 
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