Silicone Rubber Hardness Scale

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

Silicone rubber hardness scale.

These are listed from a soft silicone sheet silicone 40a to a hard silicone rubber the silicone 70a. 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. The shore durometer is a device for measuring the hardness of a material typically of polymers elastomers and rubbers.

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. Shore d hardness scale is reserved for measuring the hardness of hard rubbers semi rigid plastics and hard plastics. Generally most rubber materials fall under the rubber durometer scale of shore a. Lower numbers indicate less resistance and softer materials.

The shore d scale measures the hardness of hard rubbers and hard plastics. 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. Silicone 40a silicone 50a silicone 60a and silicone 70a. It is also available in virtually any colour and can be colour matched.

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. If your mold or cast requires flexibility or. Instead you d want to use rubber or silicone with a shore hardness around 28 32a such as rtv silicone rubber. 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.

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. Rubber or silicone with a shore hardness around 28 32a will be flexible enough to release from the mold without breaking. Semi rigid plastics can also be measured on the high end of the shore.

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. Named after its inventor albert ferdinand shore shore hardness offers different scales for measuring the solidity of different materials. Here at albright we use the shore a scale to quantify our molded silicone durometers. A rubber durometer of shore 70a is the most commonly chosen material hardness for all applications.

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