UV cure adhesive

UV cure adhesive contains resin and a photoinitiator that starts polymerisation when it receives light of the right wavelength and intensity. Many products also respond to visible light, but not all do. The practical rule is that light must reach the whole bond line. Glass-to-glass and clear plastic assemblies suit the method. An opaque metal-to-metal overlap leaves a shadow where a pure UV adhesive remains liquid. Deep sections, coloured glass, UV-blocking plastic and long lamp distance also reduce the dose. Cure time can be seconds under the specified industrial lamp and much longer, or incomplete, under an unverified torch. Match wavelength, irradiance, exposure time and bond depth to the TDS. These adhesives are used for glass furniture, optics, medical devices where the grade is approved, electronics, potting and rapid production fixtures. They are not one chemistry. Acrylic and epoxy light-cure systems differ in flexibility, moisture resistance and surface cure. Oxygen can leave some acrylic surfaces tacky unless the formulation or lamp provides the required shorter wavelength. Avoid squeezing uncured resin outside the illuminated area. Fixture in seconds does not automatically mean the whole joint has reached its final properties. Plastics also need a stress-cracking test. The liquid monomers may attack a plastic that the cured adhesive would otherwise tolerate.

Bonding clear glass to glass or metal; optical and lighting assemblies; tacking electronic components; clear potting and sealing; rapid factory assembly where lamp dose can be controlled and every part of the adhesive is illuminated.

Clean off grease, fingerprints and release agent. Confirm that at least one substrate transmits the required wavelength. Keep the bond line within the stated depth and gap. Shield the bottle and feed lines from daylight. Position the parts, remove excess where practical, then expose from enough directions to reach the whole joint. Verify lamp intensity and replace aged bulbs to a schedule.