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This scale is used for softer elastomers and flexible rubbers. The indenter used in a Shore A test is a truncated cone. The standard specified exactly how this cone penetrates the material under a specific spring force. If you are testing a rubber band or a car tire tread, you are likely using the Shore A scale.

Because DIN 53505 is inactive, modern projects should refer to the following active standards for Shore hardness testing: : The primary successor for rubber hardness.

If you are looking for a DIN 53505 PDF, you will likely find it marked as "Withdrawn." In 2012, the German Institute for Standardization (DIN) officially replaced this standard to align with international ISO norms. The modern equivalents you should look for are:

A: Assume they meant Shore A. Use ISO 7619-1 with a Shore A durometer. Report your result as "75 Shore A (tested per ISO 7619-1, which corresponds to withdrawn DIN 53505)."