The minimum sample thickness can vary depending on the type of durometer being used and the material being tested.

For example, ASTM D2240, the standard test method for rubber property-durometer hardness, specifies a minimum sample thickness of 6.4 mm (0.25 in) for Shore A and Shore D durometer tests. This is because thinner samples may not provide enough material for the indenter to penetrate and create a measurable indentation.

Other standards and specifications may have different minimum sample thickness requirements, and it’s important to consult the appropriate documentation for the test.

It’s worth noting that the durometer should be held perpendicular to the surface of the sample to ensure that the indentation is created correctly. If the sample is too thin, it may not be possible to hold the durometer perpendicular to the surface, which can result in inaccurate readings. Additionally, it’s important to ensure that the sample is supported correctly during testing to prevent it from bending or deforming, which can also affect the accuracy of the readings.

The minimum sample thickness of NextGen’s Classic Analogue Shore Durometer system is 4mm for Scale A & D and 6mm for all other scales.

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