The PTC® Model 303 ASTM Type OOO-S Shore scale durometer measures the hardness of viscoelastic polymers. Its applications are wide-ranging and include:
The distinction between OOO and OOO-S durometers lies primarily in the following factors:
Indenter Geometry: The shape and design of the indenter used in the durometer can vary between the two types, affecting how the measurement interacts with the material being tested.
Extension: There may be differences in how much the indenters extend into the material during measurement, influencing the hardness readings.
Spring Force Calibration: The calibration of spring force used in the durometers differs, which can impact the force applied to the specimen during hardness testing.
Both variations, OOO and OOO-S, are recognized under ASTM D2240 specifications and serve different purposes based on the specific requirements of the materials being tested. This allows for greater flexibility in measuring the hardness of viscoelastic polymers across various applications.
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