PURPOSE: To obtain an article usable in a case sealing a space between an objective matter and a surrounding surface by allowing a current to flow through at least one region of an article to heat the article to recover the same and increasing the wall thickness of at least a part of the article at a time of recovery.

CONSTITUTION: An article 2 is used in order to seal a space between the hole of a wall 4 and a cable 6. The article 2 is composed of a conductive polymer material and has a central convolute part 8 and end flat parts 10, 12. The convolute part 8 is preliminarily deformed and the end parts 10, 12 are preliminarily deformed so as to be capable of being shrunk in a radius direction. When an electroe 14 is electrically connected in order to seal the article to the wall 4, the central convolute part 8 of the article is heated and an adhesive 20 is melted to flow and the central part 8 is recovered so as to become deep at its convolute part. After recovery, the article comes into contact with the inside surface of the wall to be sealed thereto and the thickness of the wall increases. Next, the cable 6 is passed through the article to remove the electrode 14 and, when long electrodes 16, 18 are respectively connected to an independent power supply 26, a current flows in the peripheral direction of the respective end parts of the article and the end parts are heated to shrink to seal the cable 6 in a contact state.