[2] Tear resistance can be gauged via the same ASTM D 412 apparatus used to measure tensile strength, modulus and elongation.
Regardless of which of these two is being measured, the sample is held between two holders and a uniform pulling force applied until the aforementioned deformation occurs.
Tear resistance is then calculated by dividing the force applied by the thickness of the material.
[2] Substances with high tear resistance include epichlorohydrin, natural rubber and polyurethane.
In contrast, materials such as silicone and fluorosilicone have low tear resistance.