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| Term | Definition |
|---|---|
| U |
U
|
| Ultra-Violet Light | The light rays which are outside of the visible spectrum at its violet end. |
| Urethane Grade | Any substance which contains active hydrogens capable of reacting with isocyanate will be restricted to very low levels. Specifications for urethane grade solvents typically center on very low water and alcohol contents, typically 0.1% water or less. Glycol ethers also contain active hydrogens and are not suitable for use in urethanes. Historically, esters have contained significant amounts of alcohol. More recently, alcohol free grades of esters have been produced with the designation “Urethane Grade”. The usual quality grades of hydrocarbons and ketones ordinarily are suitable for urethanes, even though they may not be designated specifically as urethane grade. |
| Urethane Resins | Materials based on isocyanate monomer reacted with other materials to yield polymers containing any ratio of urethane linkages, active isocyanate groups or polyisocyanate monomer. The resin may contain excess isocyanate groups available for further reaction at the time of application or may contain essentially no free isocyanate as supplied. |
| UV Cure | The crosslinking of a material upon exposure to ultraviolet radiation. |
| UV Resistance | The crosslinking of a material upon exposure to ultraviolet radiation. |
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