Fukuda Co., Ltd.

Yasuhiko Higuchi

Mao Hirata

Masakazu Ito

Yuho Matsui

It is an object of the present invention to enhance reliability of an allowable limit conductance used for setting a threshold value for evaluating sealability of a test object, and further, enhance reliability of the sealability evaluation. By leak testing a test objectA with a sealing defect, a leakage characteristic that shows a relationship between an internal-external pressure difference and a leak flow rate is obtained. A conductance of a test object with a similar artificial leakB having a similar artificial leak devicedisposed therein, conducting the leak-detected substance is measured. The similar artificial leak devicehas a leakage characteristic similar to the obtained leakage characteristic. An allowable limit conductance is obtained based on results of the measurement. Sealability of a test objectis evaluated based on a threshold value set with a standard artificial leak deviceS having the allowable limit conductance.

Growing community of inventors

Tokyo, Japan

Yasuhiko Higuchi