Master Bond UV25TK is a one part UV curing system for bonding, sealing, coating and encapsulation with optical clarity and excellent physical properties. Most importantly it has a high glass transition temperature and extraordinary chemical resistance. UV25TK cures readily in 20-30 seconds when exposed to a UV light source emitting at a wavelength of 320-365 nm with an energy output as low as 20-40 milliwatts per cm². The rate of cure depends upon the compound’s distance from the light source, the thickness of the section and the intensity of the light source. It should be noted that the system can cure in sections up to 0.010-0.020 inches. However, when bonding, sections of a few thousandths of an inch are more than adequate. Master Bond UV25TK is not oxygen inhibited and therefore does not require any special treatment in that regard. It bonds well to glass, surface treated metals and plastics such as polycarbonates and acrylics, among others. UV25TK is not only effective for bonding applications, it can also be used as a coating, sealant or encapsulant. Its chemical and temperature resistance are truly amazing. UV25TK’s exceptionally high Tg of 180–185°C (TMA) exceeds that of many conventional UV-curable epoxy systems, providing enhanced thermal stability for demanding applications. As noted below in the chemical resistance chart, it withstands long-term exposure to some super aggressive solvents and related entities. The system does not contain any solvents or volatiles and features low shrinkage upon curing. Its service temperature range is -60°F to +500°F. UV25TK is a specialty type UV with a premium for chemical and temperature resistance, thus, it is a prime candidate for applications in aerospace, electronic, optical, specialty OEM and related industries. Particular attention should be paid to the information in the storage and handling section of this data sheet.
