Master Bond Polymer System UV15-7SP4DC is a new one component, optically clear, dual cured flexible UV and/or heat curable polymer system with extended service capability of -80°F to +250°F. It is 100% reactive, does not contain any solvents or other volatiles and does not embrittle even upon exposure to low service temperatures. When exposed to a source of UV light of appropriate wave lengths and adequate intensity, it cures quickly to produce flexible, tough and durable non-yellowing and chemically resistant adhesives, sealants and coatings with excellent electrical insulation properties. Thermal curing can be achieved by heating to 225-250°F for approximately 30 minutes. The UV and/or heat cured polymeric material features low shrinkage, excellent adhesion to various substrates, hardness and durability even in thick sections up to .200 of an inch and more. The combination of UV and thermal cure capability is particularly desirable for assemblies where "shadowed" areas must be cured.

Unlike any other commercially UV curable products Master Bond UV15-7SP4DC polymer system is not inhibited by air and exhibits a desirable fast curing rate at ambient temperatures even at section thickness up to .200 of an inch. Cure time depends on the type of UV lamp, the wave lengths and the amounts of the emitted UV radiation, distance of the lamp from the top surface of the UV15-7SP4DC, the thickness of the section to be cured,etc. Typical UV cure times range from as little as 5-10 seconds to 2-3 minutes at ambient temperatures. Commercially marketed 200 watt/inch medium pressure mercury vapor or equivalent UV light sources are recommended. Maximum UV absorption takes place in the 280-360 nanometer range. No solvents or other vapors are released during the curing process which takes place with minimal shrinkage from the liquid to the solid state. Any conventional source of heat including infrared heating lamps, air circulating ovens etc. is suitable for thermal curing.

Cured adhesives, sealants and coatings exhibit a most desirable performance profile including outstanding durability, toughness, thermal shock resistance, flexibility, non-yellowing color as well as excellent adhesion to many substrates ranging from glass and steel to polyester films and polycarbonates. The storage stability of the UV15-7SP4DC Polymer System is 6 months under ambient temperature conditions in original unopened containers. No refrigerated storage is needed.