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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 395 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.
Curing of this adhesive can be performed in two steps, a short pre-cure to assure proper alignment of the parts, followed by the full cure. The entire bonding surface must be uniformly exposed to the long wavelength UV light when the material is being cured.
The pre-cure allows the user to align and set precision parts quickly without long holding times and minimizes the total number of fixtures. After the precure any excess adhesive can be removed from the parts using an solvent moistened cloth. Assemblies should be inspected at that time and rejected ones can be separated in Methylene Chloride. The bonded area must be soaked in the solvent and usually required an overnight soak.
When fully cured, NOA 88 has very good adhesion and solvent resistance, but has not reached its optimum adhesion to glass. This will come with aging over a period of about 1 week in which a chemical bond will form between the glass and adhesive. This optimum adhesion can also be obtained by aging at 50 °C for 12 hours.
NOA
88 bonds can withstand temperatures of -15°C
to 60°C
prior to aging and -60°C
to 90°C
after aging. In some cases the adhesive will withstand temperatures
to 125°C
when used as a film or coating, depending on the application.
Typical Properties of NOA 88 |
|
|
Solids |
100% |
|
Viscosity at 25° C |
250 cps |
|
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 (1 MHz) |
4.06 |
|
Dielectric Strength (V/mil) |
457 |
|
Dissipation Factor (1 MHz) |
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 |
Shelf life of the liquid is a minimum of 4 months from the date of shipment, refer to the package label for the actual expiration date, if stored in a cool (5-25° C), dark place in the original container. If refrigerated, allow the adhesive to come to room temperature prior to use.
Care should be taken in handling this material. Prolonged skin contact should
be avoided and affected areas should be thoroughly washed with copious amounts
of soap and water. If the adhesive gets into eyes, flush with water for 15
minutes and seek medical attention. Use the material in a well ventilated
area, otherwise a NIOSH approved organic vapor mask is recommended.
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