U

Ultimate adhesion
The maximum adhesion available from a pressure sensitive adhesive' determined by the force necessary to remove a strip of tape from a surface after an extended period of time.

Unsaturated Polyester, UP (extended definition)
Unsaturated polyester resin exhibit greater shrinkage during cure and poorer chemical resistance than epoxy.

Urea formaldehyde resin, UF (extended definition)
Made from urea and formaldehyde. Hardens when heated and in the presence of certain chemical (catalysts or hardeners ); this hardening can be rapid and at moderate temperatures.

UV absorber / Light stabilizer
Compounding material which, through its ability to absorb ultraviolet radiation and render it harmless, retards the deterioration caused by sunlight an other UV light sources. Incorporated into adhesive, this additive screens the most harmful UV portion of light and thereby protects films and sensitive substrates from the photo-destruction.

UV / EB curing adhesive (extended definition)
Adhesive in which the liquid application changes under UV / Electron Beam exposure within seconds into the completely cured ready adhesive.