Polyurethane (PU) liners are used to provide corrosion protection in small diameter metallic pipelines and corrosion protection and semi-structural rehabilitation and leak protection in man-entry pipes, tunnels and manholes. As with cement mortar liners, polyurethane coatings require that the host pipe be thoroughly cleaned of hard deposits, nodules, scale, corrosion and other debris and be substantially dry prior to application of the coating to ensure good adhesion between the liner and the pipe wall. See Cement Mortar Lining for discussion of cleaning technologies.
Polyurethane spray-on liners, like cement mortar, protect the host pipe against corrosion and improves the flow characteristics of the host pipe. A thicker coating of polyurethane can be applied to the pipe to provide a measure of semi-structural integrity and leak protection. Polyurethane coatings inhibit corrosion by forming an impermeable barrier between the host pipe and the flow stream of the pipe.
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It is the most versatile, toughest, abrasion resistance elastomer available. It is as soft as Shore A durometer 10 and hard as Shore D scale durometer 85. |
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It could be cast into practically any shape, size or complex geometry desired wheels,
gears, O rings, gaskets, tires, roller blades, skate boards etc. |
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It can be formulated with high resistance to stresses and it tends to maintain shape and mechanical properties aster fatigue stressing. |
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Casting Polyurethane maybe pigmented to resist degradation by elevated atmospheric oxygen and ozone atmospheric concentrations. |
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Many cast polyurethane elastomers compounds remain flexible at extreme low temperatures and possess outstanding resistance to thermal shock. Low temperature resistance of polyurethanes make cast parts very practical in extreme arctic conditions. |
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Casting polyurethane parts can be made flame resistance by incorporating flame retardants into their formulas. |
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Polyurethane can be cast with coefficients of friction varying from very low, for items like bushings, bearings or wear strips, or very high, for items like tries or rollers. |
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