Silicone Rubber Hardness Scale

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

Silicone rubber hardness scale.

Shore d hardness scale is reserved for measuring the hardness of hard rubbers semi rigid plastics and hard plastics. The shore durometer is a device for measuring the hardness of a material typically of polymers elastomers and rubbers. When it comes to off the shelf silicone sheet rubber products the following silicone hardness are available. Instead you d want to use rubber or silicone with a shore hardness around 28 32a such as rtv silicone rubber.

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. 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 a scale ranges from 0 to 100.

Below is a table and chart of common finished products and their respective durometers. The shore 00 hardness scale measures rubbers and gels that are very soft. 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. 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.

Generally most rubber materials fall under the rubber durometer scale of shore a. Silicone 40a silicone 50a silicone 60a and silicone 70a. The shore d scale measures the hardness of hard rubbers and hard plastics. Semi rigid plastics can also be measured on the high end of the shore.

Rubber or silicone with a shore hardness around 28 32a will be flexible enough to release from the mold without breaking. A variety of fillers can be used in silicone rubber although most are non reinforcing and lower the tensile strength. If your mold or cast requires flexibility or. It is also available in virtually any colour and can be colour matched.

A rubber durometer of shore 70a is the most commonly chosen material hardness for all applications. 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. Higher numbers on the scale indicate a greater resistance to indentation and thus harder materials. 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.

Rubber with a shore hardness around 75a or more is most common for flat objects such as paving stones.