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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