The definition of static stiffness: refers to the ratio of the change of the pressure (or tensile force) to the change of the displacement of the shock-absorbing rubber within a certain displacement range.
The definition of dynamic stiffness: refers to the ratio of the change of the pressure (or tensile force) to the change of the displacement of the shock-absorbing rubber within a certain displacement range and a certain frequency.
The definition of dynamic magnification refers to the ratio of the dynamic stiffness to the static stiffness measured by the damping rubber within a certain displacement range, namely: Kd/Ks

Loss coefficient: In the process of shock-absorbing rubber, there is a certain phase difference between the deformation of the rubber and the stress of the rubber, and the stress of the rubber is generally ahead of the deformation of the rubber by a certain phase angle δ
Torsional stiffness: refers to the ratio between the torsional moment and the torsion angle of the shock absorbing rubber within a certain torsion angle range.

Durability: refers to the number of vibrations when the shock-absorbing rubber is in a certain direction and a certain preload, amplitude, and vibration frequency, after n times of reciprocating vibration, the product is in good condition or the product is vibrated back and forth until it is destroyed. Durability is a measure of shock absorption. Important indicators of the safety performance and comprehensive performance of rubber parts.