Absolutely. IP ratings are for varying levels of waterproof, dustproof, fingerproof. Explosion proof is a completely different animal, not addressed by IP ratings. IP is about the device being damaged by the environment. EP is about the environment being damaged by the device. Totally not the same thing. Read the Wikipedia pages on "IP code" (relatively easy read) and "explosion proof" (much harder read).
That being said, something that's waterproof is LIKELY to also be extraordinarily unlikely to ignite an explosion, except that it might have a metallic case that could cause a spark under certain conditions. It would be upon you to determine if a non-rated device is suitable for your application. If you really need EP, there's no substitute for an agency rating, especially when you're being sued.
Also, explosion proof for fixed installations is not the same as for movable devices, because fixed devices can't drop, fall, or move to cause a spark that could cause ignition.
With high quality products and considerate service, we will work together with you to enhance your business and improve the efficiency. Please don't hesitate to contact us to get more details of explosion proof rating.