Fluid-filled vibration damping device

A manufacturing method of a fluid-filled vibration damping device that includes a primary liquid chamber which gives rise to pressure fluctuations based on deformation of a main rubber elastic body at times of vibration input, an auxiliary liquid chamber which gives rise to pressure fluctuations relative to the primary liquid chamber at times of vibration input, and an orifice passage that allows flow action of a sealed fluid between the primary liquid chamber and the auxiliary liquid chamber, the method comprising the steps of:

• providing a low-adhesion energy surface with a water contact angle of at least 90 degrees to at least a part of a surface of the primary liquid chamber exposed to the sealed fluid;
• preparing a gas mixing composite constituted by a surface of a dispersion material composed of a powder body to be gasified by being exposed to the sealed fluid being coated by a solid or gel form dispersion medium to be dissolved in the sealed fluid;
• housing the gas mixing composite in a containing area of the sealed fluid and filling the sealed fluid in the containing area;
• and
• arranging the powder body gasified inside the sealed fluid filled in the containing area so as to be contained as a dissolved gas of the sealed fluid at a concentration of at least 0.03 volume %.