Cleveland, Ohio -- Lubrizol Corp.'s Estane business is introducing a new multi-layer coating technology based on an Estane thermoplastic polyurethane (TPU) for Cured-in-Place-Pipe (CIPP) liners at the 2009 No Dig tradeshow in Toronto, Canada.
The company said this new CIPP technology reduces styrene permeation by over 99 percent in current systems, while maintaining the performance benefits of TPU. These include resistance to abrasion, tear and chemicals, good low temperature flexibility and a wide range of other valuable properties.
Traditional CIPP systems commonly use styrene as a crosslinker for polyester and vinyl-ester based curing resins due to its low cost, but this has drawbacks, according to Lubrizol. The styrene resin has strong odour and contaminates water so that it requires special disposal, resulting in additional costs.
"Listening to installers of CIPP, it became apparent that finding a solution for the styrene odour release, while maintaining the current benefits and ease of installation at a reasonable cost, was one of their most pressing needs," commented Ralf Huether, Estane thermoplastic polyurethane marketing manager, in a 24 March statement from the group. "The goal was to develop the next generation coating for the CIPP tubing liner."
Estane TPU, through its exceptional tear, cut and puncture resistance during installation, has proven itself for CIPP applications as a superior coating for the tubing liners, claims Lubrizol. TPU is well known for being "soft which allows for easier installation of the tube even with the most complicated sewer systems," commented Huether, adding that also, "it can be repaired easily with cold methods such as tape or solvent patches."