UV22

Master Bond UV22 is a nanosilica filled, UV curable, epoxy based system for bonding, sealing, coating and encapsulation. It is 100% reactive and does not contain any solvents or diluents. There is no oxygen inhibition while curing. This nanosilica filled system is fully optically clear and has excellent dimensional stability. UV22 will cure quickly and easily when exposed to a UV light source with a wavelength range between 320-365 nm, with the optimum at 365 nm. The energy required is typically 20-40 milliwatts per cm². The rate of cure depends upon the distance from the light source, the thickness of the layer being cured and the intensity of the light source. In a relatively good set up, where the layer is thin and the light source is strong, it can cure as quickly as 10-15 seconds.

It cures in thicknesses of a few microns to about 1/8 inch in 15-45 seconds depending upon the depth of cure. UV22 has superior adhesion to a wide variety of substrates including plastics, glass and many metals. UV22 has excellent resistance to a wide variety of chemicals including water, acids, bases, fuels and many solvents. Other physical properties include enhanced abrasion resistance and outstanding dimensional stability. It is a reliable electrical insulator. As is typical with UVs, it has excellent optical clarity and light transmission properties. UV22 has exemplary low shrinkage properties, linearly less than 1%.

Epoxy based, cationic type curing systems, such as UV22, tend to have much higher temperature resistance than other UV type systems. Its glass transition temperature (T_g) with a straight UV cure is 100-110°C, and when post cured for 30-60 minutes at 125°C, the T_g is about 135-140°C. This post cure also enhances UV22’s chemical resistance. The service temperature range for this system is -80°F to +350°F. It should be noted that there’s no settling out of the nanosilica filler and the product retains its uniformity throughout its shelf life. It can be used for a wide variety of applications in the optical, opto-electronic, aerospace and related industries.

Product Advantages

• Cationic cure, no oxygen inhibition
• Free flowing, low viscosity
• Enhanced dimensional stability
• Good glass transition temperature
• Tested for abrasion resistance per ASTM D4060-14