A separating diaphragm, comprising: one in particular planar edge area for joining the separating diaphragm to a diaphragm seal body; one operating area, which is offset from the edge area in the axial direction by at least three diaphragm thicknesses; one transition area between the edge area and the operating area, which extends over a radial area of at least one eighth, for example not less than one seventh, in particular not less one sixth of the outer radius of the transition area, wherein the transition area extends over a radial area of no more than one quarter, in particular no more than one fifth of the outer radius of the transition area; wherein the operating area exhibits an essentially planar center, whose radius is in particular not less than one sixth of the outer radius of the transition area, wherein the operating area between the center and an outer edge of the operating area exhibits a shaped pattern or wave pattern, wherein the wave pattern borders the planar center and extends up to the edge of the operating area, characterized in that a dimensionless pressure equivalent p* is provided as: p * = p E ⋅ a h 4, that a dimensionless deflection w is provided as: w: = y h = 3 ⋅ V π ⋅ a 2 ⋅ h, wherein p represents the pressure difference between the two sides of the diaphragm, E represents the modulus of elasticity of the diaphragm material, a represents the radius of the diaphragm, h represents the diaphragm thickness, and y represents the deflection of the center of the diaphragm, assuming tapering proximity with a volume-specific shift V, which generates the pressure difference p, such that the separating diaphragm exhibits a characteristic curve p*(w) from the resting position to deflection with a dimensionless pressure equivalent p* of no less than 250, in particular of no less than 300, wherein the following characteristic curve applies to the coefficient of determination R 2 of a linear regression: (1 - R 2) < 1%, for example (1 - R 2) < 0.5%, in particular (1 - R 2) < 0.25%, and that an amplitude of the wave pattern decreases from the inside to the outside. one in particular planar edge area for joining the separating diaphragm to a diaphragm seal body; one operating area, which is offset from the edge area in the axial direction by at least three diaphragm thicknesses; one transition area between the edge area and the operating area, which extends over a radial area of at least one eighth, for example not less than one seventh, in particular not less one sixth of the outer radius of the transition area, wherein the transition area extends over a radial area of no more than one quarter, in particular no more than one fifth of the outer radius of the transition area; wherein the operating area exhibits an essentially planar center, whose radius is in particular not less than one sixth of the outer radius of the transition area, wherein the operating area between the center and an outer edge of the operating area exhibits a shaped pattern or wave pattern, wherein the wave pattern borders the planar center and extends up to the edge of the operating area, characterized in that a dimensionless pressure equivalent p* is provided as: p * = p E ⋅ a h 4, that a dimensionless deflection w is provided as: w: = y h = 3 ⋅ V π ⋅ a 2 ⋅ h, wherein p represents the pressure difference between the two sides of the diaphragm, E represents the modulus of elasticity of the diaphragm material, a represents the radius of the diaphragm, h represents the diaphragm thickness, and y represents the deflection of the center of the diaphragm, assuming tapering proximity with a volume-specific shift V, which generates the pressure difference p, such that the separating diaphragm exhibits a characteristic curve p*(w) from the resting position to deflection with a dimensionless pressure equivalent p* of no less than 250, in particular of no less than 300, wherein the following characteristic curve applies to the coefficient of determination R 2 of a linear regression: (1 - R 2) < 1%, for example (1 - R 2) < 0.5%, in particular (1 - R 2) < 0.25%, and that an amplitude of the wave pattern decreases from the inside to the outside.