Firestop sealing og GI conduits

One of our client in the oil and gas industry wants to seal voids within GI conduits to prevent vapor travel from hazaordous areas ( oil storage tank rooms) to non hazordous areas. The competitor product they currently using is
https://www.eaton.com/us/en-us/catalog/fittings/chico-a-and-chico-x-sealing-compounds-and-fiber.html.
Do have an equivalent solution for this I have attached a typical drawing for reference.