Cast polyurethane elastomers are usually two-component (2K) systems composed of an NCO-pre-polymer (or quazi-pre-polymer) and a curative defined as either a di-hydroxyl chain extender or a hindered diamine chain extender. Some of the major applications of cast elastomers include protective liners for pipes for slurry transportation, coatings for mining screens, various types of wheels, electrical potting, electrical insulators, crack sealants, gaskets, and pipeline pigs.
PU-lined steel pipe are used for transportation of abrasive slurries over vast distances and can experience a broad range of temperatures. The composition of slurries can greatly vary and can include water-based slurry from mining and drilling applications, heavy oil, salt water, petroleum, and mixtures thereof. The slurries frequently carry abrasive particles that can include sand, gravel, rocks, and other particles of varying sizes.