Are nitrile gloves adequate protection from exposure to UV light in the workplace?

With normal shielding of UV curing equipment, workers are exposed only to reflections of UV light, and normal work clothing provides adequate attenuation of UV radiation in the workplace. Most polymers and pigments are strong absorbers of UV radiation, so even a thin layer of pigmented nitrile rubber is very effective protection from UV light, which does not have much penetrating power. Even unpigmented gloves should provide adequate protection from reflected UV light.
Of course, worker training to use the correct protective equipment and to recognize the symptoms of over-exposure is essential. The symptoms of over-exposure to UV light are the same as sunburn, so workers will notice very quickly if their protective gloves or clothing are inadequate for conditions, and you can enhance the protection if necessary.