Fireproof expansion seals are newly developed high-tech products of our company. It is the replacement product of original sponge body fireproof expansion seal, which is the first in China. Its comprehensive performance is equal to or better than similar foreign products. In addition to its excellent fireproof expansion properties, the product's excellent flexibility gives it excellent sealing and shock resistance. At the same time, due to the adoption of extrusion technology, flexible fire-swelling sealing strips of various shapes and arbitrary lengths can be made according to user requirements, thus providing convenience for users. This product is an ideal fireproof sealing material for building fire protection components. Mainly used in fireproof seals of all kinds of steel fire doors, such as side seams and double-seats in the seam seal. At the same time, it can be widely used in the waterproof, fireproof, and sealing fields of elevator floor doors, fireproof glass moldings, and safes.