For solar eclipse observation, welding shade 14 is the only approved and recommended by NASA. Ultimately, these solar eclipse glasses block 99 percent of ultraviolet light and 97 percent of infrared radiation. All lens material used for Phillips Safety’s solar eclipse glasses has been certified to be Shade 14 by DIN Certo, Class 1 by notified body 0196 CE. In addition, they meet all Transmission Requirements as specified by ISO 12312-2:2015 for direct solar observation.