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UV-Curing
Epoxies
Norland Optical Adhesive 83H ("NOA83H") is a
single component liquid adhesive that cures in seconds to a tough, hard polymer
when exposed to ultraviolet light. It is recommended as an extremely fast and
efficient way to precisely bond optical components. In addition to UV light,
heat can also be used to cure this one part adhesive.
The outstanding characteristic of this material
is its extremely fast cure. Thin films can be initially set in under 10 seconds
and thick films in 20 seconds using the light sources listed below. It is also
extremely stable when not exposed to UV light. NOA 83H will not gel up in
dispenser tips or cure before you want it to.
NOA 83H is sensitive to the whole range of UV
light from 320 to 380 nanometers with peak sensitivity around 365nm. The
recommended energy required for curing a film is 2 Joules/sq. cm. A drop or bead
will require more energy and is dependent on the thickness applied. The adhesive
is designed to be cured with small hand held or desktop UV light sources that
are easy to use.
Solids |
100% |
Viscosity at 25° C |
250 cps |
Refractive Index of Cured
Polymer |
1.56 |
Elongation at
Failure |
30% |
Modulus of Elasticity
(psi) |
160,000 |
Tensile Strength
(psi) |
3,500 |
Hardness - Shore D |
85 |
Norland
Optical Adhesive 88 ("NOA 88") is an optically clear, liquid adhesive
that will cure when exposed to long wavelength ultraviolet light. The adhesive
is a one-part, 100% solids material that offers advantages in optical bonding
applications. The use of NOA 88 eliminates premixing, drying, or heat curing
operations common to other adhesive systems. Curing time can be regulated by
the end user by varying the intensity of the curing source.
NOA
88 was formulated as a low outgassing (CVCM) and low Total Mass Loss (TML) adhesive.
The ideal applications for this adhesive is for coating of parts destined for
space exploration, bonding of high tech computer components, adhering parts
in very sensitive instruments and coating sensitive components.
NOA
88 is cured by ultraviolet light (315 nm to 400 NM) with maximum sensitivity
at 365 nanometers. The adhesive requires 5 Joules/sq. cm of energy to fully
cure a
25
to 50 micron bond. The material has low oxygen inhibition, so adhesive exposed
to air will cure tack-free with sufficient exposure to UV light.
Viscosity at 25° C |
200
cps |
Solids |
100% |
Refractive Index of Monomer |
1.52 |
Refractive Index of Cured
Polymer |
1.56 |
Elongation at
Failure |
41% |
Modulus of Elasticity (psi) |
131,000 |
Tensile
Strength (psi) |
2,000 |
Hardness - Shore D |
90 |
Total Mass Loss
(TML) |
1.07% |
Collected Volatile Condensable
Material (CVCM) |
<0.01% |
Dielectric Constant at
1 MHz |
4.06 |
Dielectric Strength
(V/mil) |
457 |
Dissipation
Factor (1MHz) |
0.0341 |
Volume
Resistivity (ohm/cm) |
6.85 x 10 to the 14
power |
Surface
Resistivity (Megohms) |
3.71 x 10 to the 12
power |
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