Wyandotte, Michigan-Ageing sewer and water pipes are a concern to local authorities the world over, especially where maintenance has been infrequent. BASF Corp in the US has developed ways of using its Elastollan Lo-Tac thermoplastic polyurethane (TPU) as a cured-in-place piping refit, to renovate such old systems. Small towns and big cities alike are concerned about their water infrastructure due to years of neglect to pipes installed many decades ago," commented Luc Lupien, senior market development specialist for Elastollan TPU in North America. Many sewer pipes are cracked and severely leaking, allowing groundwater to infiltrate sewer systems, have joints out of place, or are clogged by tree roots. The costs to dig up old pipes and replace them can be astronomical," the TPU expert added, in a BASF statement. BASF says cured-in-place pipes to repair sewer systems without having to replace old piping were developed in the 1970s. Early uses were based on a TPU tube, laminated on the inside with a polyester-based felt. Either epoxy resin or a polyester thermoset resin was used to impregnate the felt, and the TPU pipe was turned inside out as it was inserted into the old pipe. Under heat, the resin cured and glued the replacement tube to the original pipe wall, forming a pipe which could last for several decades.Now, air pressure is preferred to invert the new tube into the original pipe. BASF said this is more efficient: large quantities of water to invert the tube are no longer needed. But at the same time, the water had the beneficial of lubricating the TPU and offset its inherent tackiness. Without the lubricant effect, TPU's tackiness makes it "difficult to invert, especially in smaller diameter pipes, BASF continued and hence "the attractiveness of TPU for cured-in-place piping" was diminished. New Lo-Tac technology developed by BASF in Wyandotte, "will make Elastollan TPU more attractive for cured-in-place piping projects," said Lupien. Our Elastollan Lo-Tac TPU features low tackiness, good adhesion, contact transparency, good aesthetics and process efficiency." "