LOCTITE® 3491™ provides the following product characteristics:
Chemical Type Modified acrylate
Appearance (uncured) Transparent liquidLMS
Components One component – requires no mixing
Cure Ultraviolet (UV) light
Cure Benefit Production – high speed curing
Application Bonding, Potting or Sealing
LOCTITE® 3491™ cures in seconds upon exposure to ultraviolet radiation of 365nm to form an impact resistant bond which exhibits excellent resistance to prolonged humidity or water immersion. Typical applications include bonding and sealing or potting applications of glass to itself or other materials, such as rough surface decorative glass, molded glass tableware items or automotive lighting components.
TYPICAL PROPERTIES OF UNCURED MATERIAL
Specific Gravity@ 25 °C 1.03
Refractive Index 1.48
Flash Point – See MSDS
Viscosity, Brookfield – RVT, 25 °C, mPa·s (cP):
Spindle 2, speed 20 rpm 750 to 1,500LMS
TYPICAL CURING PERFORMANCE
Cure can be effected with both low and high intensity ultraviolet light sources. A low UV intensity of 30 mW/cm² will cure highly transmitting substrates with <.25mm gap in 5 seconds or 1.77 to 2.28mm gaps in 10 to 20 seconds. A high UV intensity of 100 mW/cm² will cure highly transmitting substrates with .25mm gap in 2 seconds or 2.54 to 5.08mm gaps in 10 to 20 seconds. The table below represents typical fixture times for glass substrates with no induced gap. Full cure is estimated to be 6X the fixture time upon continued exposure to UV radiation.
Fixture time is defined as the time to develop a shear strength of 0.1 N/mm².
UV Fixture Time, ISO 4587, Glass microscope slides, seconds:
6 mW/cm² @ 365 nm 5 to 20
30 mW/cm² @ 365 nm 4
100 mW/cm² @ 365 nm 1
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