One of the many important physical characteristics to take into account while developing polyurethanes is hardness. Polyurethanes, unlike metals, rubbers, and plastics, can be specially designed to provide a wide range of hardness with different features. In this article, we’ll examine what hardness is and how it affects the performance of your product.

Hardness is a gauge of a material’s resistance to force and is frequently measured on a Shore durometer scale. The surface of the material will be more easily deformed or indented, and this will result in a softer durometer reading. To accurately gauge a material’s hardness, a variety of durometer scales are utilized. However, polyurethanes often employ just three scales: A, D, or 00. Softer materials are measured by Shore A and Shore 00, while stiffer materials are measured by Shore D.

For comparison, an inline speed skating wheel is approximately 80 Shore A, a gummy bear is approximately 10 Shore 00, and a hard hat is approximately 70 Shore D. Anything harder than a 90 shore D will fall within a Rockwell hardness scale, typically used to measure the hardness of metals. A Rockwell hardness scale, which is commonly used to gauge the hardness of metals, classifies anything that is harder than a 90-shore D.

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