O Ring Hardness Measurement

70 durometer hardness should be used whenever possible as it offers the best combination of properties for most o ring applications.

O ring hardness measurement.

This is particularly important in low pressure seals that are not activated by fluid pressure. The shore a type durometer scale is generally used to measure the hardness of most rubber. In the uk o ring sizes are specified by the british standard bs and each ring size has a related bs number. The shore a hardness measurement is often colloquially called durometer or duro.

In the o ring industry another hardness scale is used due to the curved surface of the o ring cross section causing problems with accurately reading shore a. O ring sizes are specified by the inside diameter outside diameter od and the diameter of the cross section thickness. The softer the elastomer the better the seal material conforms to the surfaces to be sealed and lower pressure is required to create a seal. This test is performed on cured rubber sheets per astm d2240 and on finished o rings per astm d1414.

The hardness of rubber o ring compounds are measured by the shore a durometer. A rubber durometer of shore 70a is the most commonly chosen material hardness for all applications. A higher durometer value indicates greater resistance to indentation on a scale of 0 to 100 with 100 indicating no indentation. Generally most rubber materials fall under the rubber durometer scale of shore a.

Shore durometer is the hardness of a material and its resistance to permanent indentation. 70 durometer hardness should be used whenever possible as it offers the best combination of properties for most o rings applications. What is the durometer of an o ring. The hardness of rubber compounds is measured by the shore a durometer.

There is shore 00 shore a shore d and others as well. 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. Durometer shore a scale is a type of measurement for rubber material hardness. The measurements are either in inches or in millimeters.

The scale is irhd international rubber hardness degrees. A rubber durometer of shore 70a is the most commonly chosen material hardness for all applications. Technical handbook o rings o ring hardness the hardness of an o ring is important for several reasons. An o ring sizing cone how to measure o ring dimensions.

Shore a hardness testing is performed using a durometer which was developed by albert ferdinand shore in the 1920s. The size and shape of the indentor used in irhd readings is much smaller thus allowing for more accurate measurements on curved. 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. This silicone o ring has a shore durometer of 70a.

Durometer is the international standard for measuring the hardness of objects like rubber and plastic.