Chemical Resistance of Norland Optical and
Electronic Adhesives
The
effects of various chemicals on Norland Adhesives were observed. Two types of
exposure to the chemicals were tested. First, a direct exposure in which a bead
of the adhesive was placed on a glass microscope slide and cured. This gave
a full surface for the chemicals to attack. The second type was an indirect
exposure in which two glass squares (1" x 1") were bonded together.
This left only a thin bondline open to attack.
Four different effects were
noted.
1. Adhesive dissolved and went
into solution.
2. Adhesive swelled at edges
and softened.
3. Adhesion to surface was
affected such that the polymer fell off or could be lifted off
easily.
4. No effect at all.
| Acids(1) |
Direct
Exposure (1 hour) |
Indirect
Exposure (24 hours) |
| 10%
Sulfuric |
4 |
4 |
| 5%
Acetic |
4 |
4 |
| 5%
Phosphoric |
4 |
4 |
| 5%
Citric |
4 |
4 |
| Water |
4 |
4 |
| Bases(1) |
Direct
Exposure (1 hour) |
Indirect
Exposure (24 hours) |
| 10%
Sodium Hydroxide |
1 |
1* |
| 1%
Sodium Hydroxide |
3 |
4 |
| 5%
Trisodium Phosphate |
3 |
4 |
| 5%Sodium
Carbonate |
3 |
4 |
| 5%
Sodium Borate |
3 |
4 |
*Dissolved adhesive approximately 3mm in on all sides. Glass still
bonded tightly otherwise.
| Solvents(2) |
Direct
Exposure (1 hour) |
Indirect
Exposure (24 hours) |
| Hexane |
4 |
4 |
| Methanol |
4 |
4 |
| Toluene |
4 |
4 |
| Methyl
Ethyl Ketone |
4 |
4 |
| Trichloroethylene |
4 |
4 |
| Dimethyl
Formamide |
2,3 |
4 |
| Acetone |
2,3 |
4 |
| Ethylene
Dichloride |
2,3 |
4 |
(1) same for 61 and 81, different for 63 & 65. They are less
resistant.
(2) same for all NOA's
24 hours is considered a short time exposure. Long term exposure
results would differ. Our adhesives will absorb water if exposed
for a long time.
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