In the previous paper of the authors, experimental and analytical studies were made on the influencing factors in asbestos-joint sheet gasket affecting the tightening characteristics under the pressure of internal fluid up to 20Kg/cm2. In the present paper, the authors propose an empirical formula regarding the relation between the gasket factor and leak pressure. And the authors made further analytical discussions in the paper about the condition in which the internal diameter of gasket was of constant quantity in the influencing factors and the width and thickness were of variable quantity, and the internal fluids applied were water and machine oil.In the present paper, experimental and analytical studies were made under the condition in which all the width and the internal diameter are of variable quantities and the internal pressure applied ranges between 1 to 60Kg/cm2. The specimens tested in our experiments are asbestos-joint sheet, synthetic rubber and vinyle chloride gaskets.