LED405FL3 is a low-viscosity system that can be used for small potting and encapsulation applications, assuming that there are no shadows or concealed areas.
Master Bond LED405FL3 is reportedly a flexible, one-component, LED-curing adhesive system with excellent optical clarity and a refractive index of 1.51. Its flexibility allows for stress minimization, especially when bonding substrates with different coefficients of thermal expansion. It also utilizes a fluorescent dye for detection purposes, which enables easy visual inspection.
The company reports that this no-mix system achieves full tack-free cure following exposure to a 405-nm wavelength light source without any oxygen inhibition. In thinner sections, full cures can be achieved in 30-45 seconds. The rate of cure depends on the intensity of the light source, the thickness of the adhesive layer, and the distance from the light to the adhesive.