Dilution of UV monomers in UV adhesive formulations,this is one of the first factors to consider when choosing UV monomer, when UV monomer dilution is strong then means use less monomers can effectively reduce the viscosity of UV adhesive in the UV adhesive formulations.The general situation is that the low viscosity of the monofunctional UV monomer ,the strong in dilution.  But UV of multifunctional groups monomer has higher viscosity and poor dilution.