Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Effect of Surface Properties on Sealing Performance of Liquid Gasket

Akira KAKUTAa, Yusuke UESUGI and Yuki SAIKACHI

1Department of Mechanical Engineering, Institute of National Colleges of Technology, Tokyo college, 1220-2 Kunugida-machi, Hachioji-shi, TOKYO, JAPAN, 193-0997


It is common practice to use various solid or liquid sealing materials to fill gaps to improve sealing performance, that is sealability, in fastening parts of screws and pipes. Among these sealing materials, liquid sealing materials which is called liquid gaskets or sealants are possible to deform according to the surface geometry of the fastening area and improve the effect of sealing because of their fluidity. To ensure the effect of sealing, the fastening surface which attached each other should be smooth to some extent. Although excessive smoothness increases costs, it is unclear the proper condition of surface geometry for the sealant. It is important to have a guideline for appropriate surface geometry are required. The purpose of this study is to experimentally clarify the relationship between the surface geometry and sealing effect of a liquid sealing implementation method, test specimens with regular geometry were prepared as the surface geometry. The geometries were concentric circles, parabolize and so on with different pitches and depths. This study investigated how the sealant material, pitch, and depth affect the sealing effect of the joint by using two types of liquids, five different pitches, and two different depths in a pattern, while maintaining a constant tightening torque. One of the tightening test materials was made of acrylic, and the sealing process was observed with a high-speed camera. The process of change of the sealant was also observed at regular intervals during the drying of the sealant. For the experiments results, this study discussed the proper conditions of surface properties for sealing.

Keywords: Liquid gaskets, Surface roughness, Sealing performance

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