The durometer selection guide cited from ASTM D2240 is designed to assist in the selection of the proper durometer type for various applications.
It is generally recognized that durometer hardness determination below 20 and above 90 are unreliable. It is recommended that the next lower or higher type (scale) be used in these situations.
It is also recommended that, whenever possible, an operating stand be employed in performing durometer hardness tests.
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