Abstract: A gasket 4 includes: a cylindrical body portion 10 having a communication hole 10a for providing communication between flow passage holes 2c, 2c formed in two fluid devices 2, 2, respectively; and an annular primary sealing portion 11 projecting from a radially inner side of an axially outer end portion of the body portion 10 toward an axially outer side and to be press-fitted into an annular primary sealing groove 2d formed in each fluid device 2. In a state before the primary sealing portion 11 is press-fitted into the primary sealing groove 2d, an entirety of an inner circumferential surface 10b of the body portion 10 is formed such that a diameter thereof gradually decreases from both axially outer ends thereof toward an axially inner side.

Abstract: A gasket 4 includes: a cylindrical body portion 10 having a communication hole 10a for providing communication between flow passage holes 2c, 2c formed in two fluid devices 2, 2, respectively; and an annular primary sealing portion 11 projecting from a radially inner side of an axially outer end portion of the body portion 10 toward an axially outer side and to be press-fitted into an annular primary sealing groove 2d formed in each fluid device 2. In a state before the primary sealing portion 11 is press-fitted into the primary sealing groove 2d, an entirety of an inner circumferential surface 10b of the body portion 10 is formed such that a diameter thereof gradually decreases from both axially outer ends thereof toward an axially inner side.

Abstract: The calcium carbonate particles of the present invention are coated on their surface with (1) a fatty acid mixture comprising (1A) at least one of saturated fatty acids and salts thereof and (1B) at least one of unsaturated fatty acids and salts thereof, the (1A):(1B) weight ratio being in the range of 30:70 to 70:30, and (2) an organic compound such as a phthalic ester. The calcium carbonate particles of the invention easily disperse in the resin and other components that constitute an adhesive composition, and impart excellent viscosity stability and highly improved adhesion to the resulting adhesive.

Abstract: The calcium carbonate particles of the present invention are coated on their surface with (1) a fatty acid mixture comprising (1A) at least one of saturated fatty acids and salts thereof and (1B) at least one of unsaturated fatty acids and salts thereof, the (1A):(1B) weight ratio being in the range of 30:70 to 70:30, and (2) an organic compound such as a phthalic ester. The calcium carbonate particles of the invention easily disperse in the resin and other components that constitute an adhesive composition, and impart excellent viscosity stability and highly improved adhesion to the resulting adhesive.