Elastomeric materials are usually measured with either a shore a scale durometer or an irhd dead load system.
Rubber hardness scale.
Shore durometer hardness is a measure of the resistance a material has to indentation.
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.
Higher numbers on the scale indicate a greater resistance to indentation and thus harder materials.
For example a material with a shore hardness of 95a is also a shore 50d.
A rubber durometer of shore 70a is the most commonly chosen material hardness for all applications.
There are several scales to measure the hardness of an elastomer used for materials with different properties shown in the diagram below.
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.
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.
When selecting rubber sheet there are various thicknesses and lengths but also varying hardnesses.
Two such scales using slightly different measurement systems are the shore a and shore d scales.
Shore who developed a measurement device called a durometer in the 1920s.
The durometer scale was defined by albert f.
Lower numbers indicate less resistance and softer materials.
Hardness may be defined as a material s resistance to permanent indentation.
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.
The hardness of rubber measured by means of a durometer is expressed in the unit shore a.
Generally most rubber materials fall under the rubber durometer scale of shore a.
The shore a hardness scale measures the hardness of flexible mold rubbers that range in hardness from very soft and.
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.
The most commonly used gauges for measuring the hardness of rubber are the durometer and the irhd meter.
Shore hardness and how it relates to other properties.
Hardness is one of the most commonly used properties to specify a rubber.
Hardness is an important consideration in sealing materials.
Some of hapco s materials are available in both shore a and shore d.
As you can see from the graphic there is overlap on the different scales.
The shore 00 hardness scale measures rubbers and gels that are very soft.
A chart showing general hardness comparisons is below.
