When a static load-deflection specification is established for a product—in addition to a hardness requirement—the load-deflection specification shall supersede the hardness requirement. Additionally, the specification should be agreed upon by both the customer and the rubber manufacturer, and then be clearly stated on the product drawing. A static test is only “static” in that the load application comes to rest before the measurement is taken; or that the rate of deflection does not normally exceed 0.8mm/s (2 in/min). Such a test usually places the rubber in shear or compression.

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When applicable, the design engineer must specify method of test, spring rate, and load deflection along with associated tolerances. If damping characteristics are required as a part of a dynamic specification, commercial tolerances would be ±25% on parts up through 65 durometer hardness (SHORE A) and ±30% for parts above 65 durometer hardness (SHORE A).

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Rubber is stiffer dynamically than when in a static mode; and since the static-to-dynamic stiffness ratio varies with individual compounds, it may be advisable to specify the dynamic characteristics of the rubber for usages of this manner.

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The aging of rubber compounds over time is a complex process. The normal net effect of aging is an increase in modulus or stiffness. The magnitude of this change is dependent upon the specific material involved, as well as the environmental conditions to which it was subjected.

Short-term age, in the sense of the least possible number of hours that should elapse between molding and subsequent evaluation, is also a significant factor affecting load deflection. Depending upon the nature of each particular product, this minimum period will vary from 24 hours to 168 hours.

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The load-deflection characteristics of a rubber product are affected by its work history. For new parts, or parts that have been in a static state for a period of time, their initial loading cycles indicate a stiffer load-deflection characteristic than noted in subsequent cycles. In static testing, this effect becomes stabilized, and so the load-deflection characteristics typically become repeatable after two to four conditioning cycles. In dynamic testing, the conditioning period is usually designated as the amount of time necessary for obtaining reproducible results.

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Rubber and urethane provide greater deflection for applied forces than do rigid materials such as metals or ceramics. Most uses of rubber are based upon this characteristic. Urethane may be selected for the same attribute, in addition to its excellent impact strength and abrasion resistance.

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When dynamic stiffness or spring rate is specified, and is also determined to be critical to the performance of the rubber product, the complete test conditions and methods of measurement must be clarified between customer and rubber manufacturer.

Where rubber is used as a vibration isolator, such applications are dependent upon the behavior of the rubber when subjected to these dynamic operating conditions.

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The following details must be defined by the product drawing, or by the referenced specification, to ensure both a relevant and consistent evaluation of product performance:

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Temperature affects spring rate. For a rubber product not under continuous tension: the higher the temperature, the lower the spring rate, and the lower the temperature, the higher the spring rate.

Often, when making use of rubber, stiffness variation is not critical to the rubber product’s function, and in such cases, the Shore A durometer hardness specification is sufficient. But rubber is frequently used as an engineering material in applications like resilient mountings, vibration isolators, dampers, impact pads, and similar. In instances where static or dynamic stiffness characteristics become critical to a product’s function, appropriate test specifications must be instituted.

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