One part epoxy changes from red to clear under UV light

Master Bond has launched a low viscosity, cationic type ultraviolet (UV) curing system with a special color changing feature. The originally red material changes to clear once exposed to UV light, indicating that there is UV light access across the adhesive material. Although this change in color from red to clear does not indicate a full cure it does confirm that the UV light has reached the polymer.

By giving immediate visual feedback UV15RCL offers processing and handling advantages over conventional systems. Curing under UV light typically takes 30 to 60 seconds with a broad-spectrum UV lamp emitting light with a wavelength range between 320 nm to 365 nm. The minimum energy required is 20Source: Master Bond mW/cm² to 40 mW/cm².

UV15RCL features a high glass transition temperature (Tg) of 90° C to 95° C. However, when post cured for one to two hours at 125° C, the Tg can increase to 125° C to 130° C. It has a service temperature range from -80° F to 350° F. This non-solvent based system cures tack free and has a very low viscosity of 115 cps to 350 cps, making it ideal for spin coating. It is not oxygen inhibited and provides light transmission properties and good optical clarity, with a refractive index of 1.517. Also, it is an excellent electrical insulator with a volume resistivity exceeding 1014 ohm-cm.

UV15RCL is suitable for bonding and sealing applications as it adheres well to metals, glass, ceramics and many plastics, including acrylics and polycarbonates. It is available in a wide range of packaging options, including syringes, ½ pint, pint, quart and gallon containers.

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