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Tpes Put The Snap Into Aerodynamic Swim Fin Design

01 September 2000

TPEs put the 'snap' into aerodynamic swim fin design



Scubapro's TwinJet dual-blade swim fin has a propulsive action similar to
the lift developed by an aircraft wing, enabling divers to achieve high
forward thrust from a gentle kick. During development, Scubapro sought a
tough material with elastic memory enabling the blades to 'snap' back
quickly to their original positions after each stroke; the material also
had to resist tearing as a result of the constant flexing action.

Rapid elastic recovery or resilience ('snap') is typically provided by
natural rubber formulations, but these materials provide insufficient
outdoor weathering resistance. Scubapro looked at EPDM synthetic rubber
but it lacked the all-important snap factor. The company finally decided
to go for a thermoplastic elastomer (TPE), and while many TPE's tried
also lacked snap, Monprene TPE from Teknor Apex subsidiary QST had the
elasticity, resilience and weather resistance necessary for the
application.

There are two TwinJet models, each injection moulded using different
custom formulations of Monoprene.


















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