Silicone Rubber Hardness Scale

Here at albright we use the shore a scale to quantify our molded silicone durometers.

Silicone rubber hardness scale.

Silicone rubber is available in a range of hardness levels expressed as shore a or irhd between 10 and 100 the higher number being the harder compound. When it comes to off the shelf silicone sheet rubber products the following silicone hardness are available. The shore durometer is a device for measuring the hardness of a material typically of polymers elastomers and rubbers. Lower numbers indicate less resistance and softer materials.

If your mold or cast requires flexibility or. 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. These are listed from a soft silicone sheet silicone 40a to a hard silicone rubber the silicone 70a. While not needed for plaster casting shore hardness proves helpful when you have to choose your materials such as which silicone rubber should be used for making a mold or cast.

Semi rigid plastics can also be measured on the high end of the shore. A rubber durometer of shore 70a is the most commonly chosen material hardness for all applications. Generally most rubber materials fall under the rubber durometer scale of shore a. Educational specialist rubber sheetings silicone manufactured rubber components 26th nov 2019 shore durometer hardness is a measure of the resistance a material has to indentation.

Named after its inventor albert ferdinand shore shore hardness offers different scales for measuring the solidity of different materials. Remember that the higher the rating the harder and less pliable the rubber material will be compared to elastomers with a lower durometer rating. The shore 00 hardness scale measures rubbers and gels that are very soft. The shore a scale ranges from 0 to 100.

Below is a table and chart of common finished products and their respective durometers. Higher numbers on the scale indicate a greater resistance to indentation and thus harder materials. Understanding shore s durometer hardness scale can create a world of difference when picking out material as the ratings will always tell you how hard flexible and resilient each rubber is. Shore d hardness scale is reserved for measuring the hardness of hard rubbers semi rigid plastics and hard plastics.

Silicone 40a silicone 50a silicone 60a and silicone 70a. The shore a hardness scale measures the hardness of flexible mold rubbers that range in hardness from very soft and flexible to medium and somewhat flexible to hard with almost no flexibility at all. Instead you d want to use rubber or silicone with a shore hardness around 28 32a such as rtv silicone rubber. It is also available in virtually any colour and can be colour matched.

A variety of fillers can be used in silicone rubber although most are non reinforcing and lower the tensile strength.