Thermoset Urethane (TSU)
Definition - What does Thermoset Urethane (TSU) mean?
A thermoset urethane is a type of synthetic crystalline compound that has been permanently cured to be infusible and insoluble. Thermoset urethane compounds possess molecular forces that are spring-based with strong intermolecular attractions, giving them the unique physical characteristic of being both flexible and tough. Thermoset urethanes are a key ingredient in corrosion prevention coatings.
Corrosionpedia explains Thermoset Urethane (TSU)
Some protective coatings are created from thermoset urethane compounds such as aliphatic acrylic urethane. These coatings typically have high tensile strengths and elongations that are maintained at significantly low temperatures. This trait makes them very useful for protecting metallic surfaces outdoors. However their use in high temperature environments above 100°C (212°F) is best implemented with the complimentary use of an epoxy coating for support.
Thermoset urethane is molecularly stronger than thermoplastic due to its possession of intermolecular crosslinks of high density and aromatic content.