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UV-Curing
Epoxies
Norland Optical Adhesive
72 ("NOA72")is an optically clear, liquid adhesive that will cure
when exposed to either long wavelength ultraviolet light or visible light. This
one part,low viscosity adhesive is 100% solids and offers advantages in optical
bonding applications. The use of NOA 72 eliminates premixing, drying or heat
curing operations common to other adhesive systems.
NOA 72 is recommended for
bonding plastics such as acrylic, polycarbonate, cellulose acetate butyrate
or glass where low UV light transmission prevents curing of other adhesives.
Typical applications would be bonding of compound lenses, laminating polarized
film between glass or plastic or bonding leaded glass.
NOA 72 is cured by ultraviolet
light between 315 to 400 nanometers and visible light between 400 to 450 nanometers.
The peak absorption wavelengths are 320, 365 and 420 nm. Full cure requires
5 Joules/sq. cm of energy between 315 and 450 nm.
NOA 72 can withstand temperatures
after aging from -80° C to 90° C for bonds to glass, while nonaged glass
and plastic bonds will withstand temperatures from -15° C to 60°C. In
some cases the adhesive will withstand temperatures to 125° C when used
as a film or a coating depending upon the application.
Viscosity at 25°
C |
155 cps |
Refractive Index of Cured
Polymer |
1.56 |
Hardness - Shore D |
75 |
Dielectric Constant at 1
MHz |
3.98 |
Dielectric Strength
(V/mil) |
456 |
Dissipation Factor at 1
MHz |
.0351 |
Volume Resistivity
(ohm/cm) |
7.37 x 10 to the 14
power |
Surface Resistivity
(ohm) |
3.73 x 10 to the 12
power |
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