| Word | Description |
| Urethane Casting | Urethane Castings are produced using low-cost silicone molds, which are sometimes called RTV (Room Temperature Vulcanization) molds. The process begins with a Master Pattern, which can be constructed using rapid prototyping . Depending on the material to be cast, as well as other factors, the master pattern may be scaled to compensate for shrinkage in the final material. In most cases, draft is not an issue and small undercuts are not a problem because the silicone mold is flexible. |
| UV | Ultraviolet Light energy situated beyond the visible spectrum at its violet end -- having a wavelength shorter than wavelengths of visible light and longer than those of X rays Often used in the curing of photopolymer resins. |