NOA-108

NOA 108 is a single component, UV curing adhesive used for temporary bonding of lenses to metal polishing mounts or where bonded components need to be easily separated in the future. The adhesive cures in minutes at room temperature by exposure to longwave UV light and eliminates the heat induced strain typical of the old fashioned hot pitch blocking methods.
NOA 108 is specifically formulated to provide low shrinkage and low strain to further minimize any potential strain on the lens during the blocking process. Debonding is accomplished by soaking parts in a soapy warm water solution or acetone.

The adhesive cures only by exposure to UV light in the range of 350 to 380 nanometer.
Lenses typically separate after soaking in acetone for 10 to 60 minutes. Debonding time is a function of surface area. Plano surfaces will require more time than surfaces with only slight edge contact. Lenses may also be debonded just by heating between 80 and 100° C. After separation, the components and tools are cleaned in the detergent/water.
Lenses may also be debonded just by heating between 80 and 100° C. After separation, the components and tools are cleaned in the detergent/water solution.

Pre-Curing

room temperature 22°C using a long wave black light UV-light source (350-380 nm, 100 Watt) ca. 15 cm above the element
UV-Light (350-380 nm, 15 Watt) ca. 8 cm above the element.
ca. 15 seconds ( 1 mil, 100 Watt)
ca. 60 seconds (40 mil, 100 Watt)

ca. 60 seconds( 1 mil, 15 Watt)
ca. 180 seconds (40 mil, 15 Watt)

Full-Curing

room temperature 22°C using a long wave black light UV-light source (350-380 nm, 100 Watt) ca. 15 cm above the element
UV-Light (350-380 nm, 15 Watt) ca. 8 cm above the element
5 minutes ( 1 mil, 100 Watt)
20 minutes ( 40 mil, 100 Watt)

20 minutes ( 1 mil, 15 Watt)
60 minutes (40 mil, 15 Watt)

Technical Data

Solids : 100%
Viscosity at 25° C: 550cps
Refractive Index of Cured Polymer: 1.51
Elongation at Failure: 18%
Modulus (psi): 710
Tensile Strength (psi): 101
Hardness - Shore D: 25
Shipping and Storage: Should be kept from intense light and
elevated temperatures.
Shelf live: at least 6 months from the date of shipment, if
stored in a cool (5-22°C), dark place in
original container.
Packing Size: 30 g (1 oz)