Aging Test on Norland Optical Adhesive

Two types of accelerated aging tests have been run on Norland Optical Adhesive 60 and 61. The purpose was to determine the effect of long term aging in a reasonable length of time.

Heat Aging

Glass doublets bonded with NOA 60 and NOA 61 were placed in an oven @ 50°C for 3 years and judged for deterioration and discoloration. During this time no separations or voids appeared in the doublets and no discoloration was visible. If we assume that for every 10° rise in temperature, the effect of aging doubles, then this would be equal to 24 years of room temperature aging.

Ultraviolet Aging

Samples for UV aging were prepared by bonding 3" x 4" projector slide cover glasses together with NOA 60 and NOA 61. These were exposed in a light box consisting of a rotating turntable and four 275 watt sunlamps positioned 10" away. The turntable was cooled by a fan to keep the temperature of samples around 40°C.

The UV aging test was run for 7 weeks. Most epoxies and polyester cements will show discoloration after this length of exposure. The NOA samples showed no discoloration or deterioration at all between the laminated glass. This amount of light would be analagous to the light exposure a projector lens may receive over its useful life. Good stability under high intensity light such as this is also important for lenses used in photocopiers, laser systems and fiber optics applications.

Conclusion

NOA 60 and NOA 61 show no change in physical characteristics with accelerated aging and should be expected to show no change in an optical system over its useful life.

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