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Latest News...

Rubber in Engineering Group @ Clwyd - Sep 2018

Clwyd welcomed the Rubber in Engineering Group on Friday 21st September, more than 20 more

Polymer Types - PU - Polyurethane...

Clwyd reference PU
ASTM classification

AU (ester urethanes)
EU (ether urethanes)

Millable polyurethane, which may contain an ester group (AU) or an ether group (EU)

Typical applications Seals for high hydraulic pressure and highly stressed parts subject to wear

Excellent tensile strength and anti-abrasion properties
Excellent ozone resistance
Good resistance to oils


Poor resistance to some non-polar solvents
Poor steam resistance

Available hardness range (Shore A) 25 – 85
Upper continuous service temp. (°C) 150
Min. temp. for sealing applications (°C) -50
Minimum non-brittle  temp.  (°C) -80
Tensile strength (up to) 30 MPa
Elongation at break (up to) 600%

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