Rubber Hardness Scale

The a scale is for softer materials such as rubber while the d scale is for.

Rubber hardness scale.

A flattened cone is pressed through a spring into the surface of the rubber. For example a material with a shore hardness of 95a is also a shore 45d. Hardness is an important consideration in sealing materials. Thus if you need a rubber or o ring durometer that feels like a running shoe sole review our rubber hardness chart below then pick shore 70a.

The shore durometer is a device for measuring the hardness of a material typically of polymers elastomers and rubbers. Hardness may be defined as a material s resistance to permanent indentation. These tests are designed for use with samples approx 6mm thick and a surface area sufficient to permit at least 3 test points 5mm apart 13mm from any edge. There are several scales to measure the hardness of an elastomer used for materials with different properties shown in the diagram below.

As you can see from the graphic there is overlap on the different scales. Shore who developed a measurement device called a durometer in the 1920s. A rubber durometer of shore 70a is the most commonly chosen material hardness for all applications. Lower numbers indicate less resistance and softer materials.

The most commonly used gauges for measuring the hardness of rubber are the durometer and the irhd meter. Shore durometer is a scale used industry wide to measure the hardness of rubber and plastic materials. Elastomeric materials are usually measured with either a shore a scale durometer or an irhd dead load system. Shore hardness and how it relates to other properties.

The shore 00 hardness scale measures rubbers and gels that are very soft. For example a material with a shore hardness of 95a is also a shore 50d. When selecting rubber sheet there are various thicknesses and lengths but also varying hardnesses. Named after its inventor albert ferdinand shore shore hardness offers different scales for measuring the solidity of different materials shore was born in 1876 and lived until 1936 creating the shore scale in the 1920s.

Some of hapco s materials are available in both shore a and shore d. Shore durometer hardness is a measure of the resistance a material has to indentation. Hardness is one of the most commonly used properties to specify a rubber. The shore a hardness scale measures the hardness of flexible mold rubbers that range in hardness from very soft and.

The durometer scale was defined by albert f. Tpes can range from 10 shore 00 up to 72 shore d spanning all three hardness scales however the most commonly used is the shore a scale. Higher numbers on the scale indicate a greater resistance to indentation and thus harder materials. As you can see from the chart below there is overlap on the different scales.

Generally most rubber materials fall under the rubber durometer scale of shore a.