This UL rating means that the light fixture will not act as a fire promotor to further spread flames, due to its certified fire resistance and self-extinguishing characteristics. Our Exit Signs are made of ABS fire resistant plastic. The UL 94V-0 rating is based off a product test that involves burning the vertical part of a product to check whether it will extinguish itself after 10 seconds. You can learn more about all the certifications and the companies that certify our products in our Certifications page.