The Soft Side of the Hard Durometer: EXPOSED!

At Jehbco we have spent over 40 years manufacturing Pure Silicone for a range of applications. Food Processing, Construction, Medical & Defence are some of the key industries that often purchase Silicone for almost anything from Tubing to that of Sealing massive high-rise facades.

“Durometer” is one of the terms we often use in Elastomer / Silicone Engineering when we are trying to measure / categorize the hardness of a given material. It can be used for say measuring the hardness of soft rubbers to heavy plastics.

In terms of “Hardness” we mean this in a slightly different sense to its common understanding. With a reference to its creator Albert Ferdinand Shore, he created a measurement device that measures the indentation into a material created by a given force on a standardized pressure foot.
With a scale of 0 – 100, with 0 = Soft / Large Indent and 100 = Hard / No Indent – we refer to a range of materials with this scale. Most of our Silicones are made with a hardness from 25 duro to 80 duro.

25 duro silicone can be easily compressed with the fingers and often finds its way into applications that require flexibility and softness. Common examples are medical / surgical tubing or even O-Rings that under pressure intentionally squeeze to form seals.

On the harder 80 duro end – the Silicone can almost start feeling like a “Hard Leather Belt” in the sense that it could not be compressed with fingers and may find its way into more external applications where it has to retain its shape (even under extreme weathering).

It’s important to note too that it’s not whether “Harder is better than Softer”. With Silicone & Elastomers of this nature, it’s all what is required for a given custom application.

To learn more, browse our website for more information. If we can help you with your Silicone Solutions, contact us here.