The fireproof expansion sealing strip is a sealing strip composed of an external PVC decorative layer and an internal fireproof expansion body. Its beautiful and novel style is deeply in favor of the majority of users. It is mainly used for doors, doors and frames of fire door products. When a room is on fire, when the temperature reaches a certain value, the air circulation between the two rooms is isolated to prevent the spread of flame. The application of this product has replaced the asbestos rope used in the cracks of domestic fire doors, and passed the latest standards of the State Quality Supervision and Inspection Center for Fireproof Building Materials. All indicators have been qualified.