How to judge the quality of silicone rubber products by tear strength and elongation

How much do you know about the importance of tear strength and elongation indicators of silicone products?

To judge the elasticity of silicone products, the greater the tensile strength at break, the better. But should the elongation at break be as large as possible?

In silicone materials, the tensile strength at break generally refers to the stress value before the material breaks when it reaches the maximum strength.

Elongation at break is the ratio of the maximum elongation of silicone material before stretching to fracture to the original length before stretching, usually expressed as XX%.

For silicone materials, the elongation at break of materials with high tensile strength is generally not high.

With respect to tear strength, it refers to the resistance that prevents the notch or notch from expanding when applying force on the sample with notch. The hot vulcanized solid silicone rubber can not be torn even if it is placed under extremely high torsional stress after cutting. The tear strength range of hot vulcanized solid silicone rubber is between 9-55 kN/m. The tear strength range of fluorosilicone rubber is between 17.5-46.4 kN/m. The tear strength of liquid silicone rubber ranges from 11.5-52 kN/m. Elongation. It usually refers to "ultimate rupture elongation" or the percentage increase relative to the original length when the sample breaks. The elongation of hot vulcanized solid silicone rubber generally ranges from 90 to 1120%. The elongation of fluorosilicone rubber generally ranges from 159 to 699%. The elongation of liquid silicone rubber is generally between 220 and 900%. Different processing methods and the choice of hardener can greatly change its elongation. The elongation of silicone rubber is closely related to temperature.