Read hardness as one property
Shore A is a scale used to describe indentation hardness. It does not by itself specify sealing performance, removal force, chemical suitability or service life. When requesting a plug, state the target hardness together with the geometry, application and the other properties that matter to the assembly.
Compare the fit in context
Evaluate candidate hardness options in the same hole and with the same installation method. Record insertion force, seating, retention and removal, rather than relying only on hand feel. Geometry and available contact area also affect the result, so a hardness change should be reviewed alongside the drawing.
Agree how hardness is checked
Ask the supplier to define the measurement method, sample form, conditioning and acceptable range. A small curved plug may need an agreed inspection approach rather than a casual reading taken on any available surface. Link the inspection requirement to the exact compound and production approval.
Confirm after service exposure
Repeat the relevant fit and function checks after the intended temperature, chemical and reuse cycle. If a different hardness is proposed, test samples against the same acceptance criteria. Keep the approved compound, hardness range and drawing revision together for future orders.
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