Types of Tuftane TPU Available

As with other thermoplastic elastomers TPU's derive their performance from their basic chemical structure.  This is characterised by hard and soft segments- the former provides stiffness and the latter yields flexibility.  During processing the hard parts can soften and so allow the material to be shaped but on cooling they reform to yield the elastomeric behaviour required.

Most TPU's are based on MDI (Methylene diphenyl isocyanate) as the isocyanate(hard segment), while the polyol (soft segment) is widely varied.  The main distinction is between polyether or polyester polyols:

• Polyether Polyols - best hydrolysis and microbiological attack resistance.
• Polyester Polyols - best tear and chemical resistance.

The third basic component is the chain extender which controls the molecular weight and chain length of the polymer and therefore the hardness/flexibility.

Properties of Tuftane TPU

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