The dynamical‐mechanical properties of elastomer materials, which are widely used in devices such as antivibration mounts, are known to depend upon the nature of the loading of the material. While many aspects of the dependence of the dynamic properties on frequency and temperature are well known and customarily accounted for, these properties are also known to vary significantly with other aspects of the loading such as strain amplitude and static load. Furthermore, not all of these aspects of the loading appear to act independently. In this paper we discuss the dependence of the dynamic properties of elastomers on frequency, dynamic strain amplitude, and static loading. While the effects of frequency and strain amplitude appear to be separable, it does not appear to be as easy to deal with the effects of static loading. The implications of these effects on designs using elastomers is discussed. [Sponsored by USN Office of Naval Research—Structural Mechanics Program.]