UV Penetration

Each cure material (adhesive, ink) has specific absorption characteristics that react to a certain UV wavelength.

UV light curing is widely used in the assembly of micro-electronics, medical, fiber optic assembly and printing industries.

It is important that the spectral output (the intensity of light at each wavelength over the whole wavelength range emitted by the lamp), is matched with the absorption characteristics of the photoinitiator of the cure material.

Some important wavelength regions include 250nm (UVC range) which is associated with surface cure, 320 and 365nm (UVB and UVA range) where wavelengths greater than 350nm improve depth cure, and the range between 400 and 500nm (Visible light) which employs visible photoinitiators to absorb light and to provide even greater depth of cure.