A new proprietary technology reportedly can produce TPU resins having a very low coefficient of friction (COF) without any lubricants, waxes, or fillers that cause blooming or reduce transparency. The low COF and non-tackiness of the Elastollan Lo-Tac family from BASF Corp., Urethanes Div., Wyandotte, Mich., are reportedly suited to cured-in-place piping used to rehabilitate aging sewer pipes. According to BASF, TPU became less attractive for cured-in-place-piping when hot air replaced hot water as the preferred way to invert the replacement tube. Water lubricates the TPU to offset its inherent tackiness. But the dry air-pressure process makes the TPU liner tacky and difficult to invert, especially in smaller pipes.
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