Master Bond UV18 is a new one component, high strength UV curable chemically and water resistant polymer system for coating, sealing, & bonding with exceptionally high performance properties. It is a 100% reactive, low viscosity liquid at ambient temperatures which does not contain any solvents or other volatiles. When exposed to a source of UV light, Master Bond UV18 produces durable, strong, tough flexible and highly chemically resistant coatings and adhesive/sealants with excellent electrical insulation properties. Fastest cures are obtained with light sources emitting at a wave length of 250-320 nm. Shrinkage upon cure is substantially less than that of conventional UV systems. The cured coatings and adhesive/sealants can be used over the exceptionally wide temperature range of -60°F to over 250°F. Unlike many other commercially available UV curable products, Master Bond UV18 is not oxygen inhibited and exhibits a desirably fast cure rate at ambient temperatures even in the presence of air. The superior performance profile of UV18 is due to its unique hydrophilic polymer backbone structure and its special free radical cure mechanism. Master Bond Polymer System UV18 features excellent chemical resistance to ethanol, toluene, xylene etc. as well as up to 50% sulfuric acid, sodium hydroxide and water even upon prolonged exposure. Also the water vapor permeability is very low indeed. Master Bond UV18 can be cured in very short time periods, e.g. 1 minute and less, at ambient temperatures with various commercial UV lamps. A conventional 200 watt/inch medium pressure mercury lamp is recommended. Even with low intensity UV sources, cures can be obtained quickly. No solvents or other volatiles are released during the curing process. Cured coatings or adhesive/sealants are durable and tough and feature excellent adhesion to both metallic and nonmetallic substrates, from bonderized steel to Mylar polyester film. Impact strengths are high - Gardner impact measurements exceed 320 inch #. Properties of typical UV18 coatings are summarized in table #1. Storage stability of Master Bond UV18 is 6 months under the usual storage conditions in unopened containers.