When choosing a silicone seal, the first thing to consider is its tensile strength, constant tensile stress, elongation at break, permanent deformation at break, stress-strain curve, etc. These are collectively referred to as tensile strength. Tensile strength is actually the maximum tensile stress at which the sample breaks in tension. Constant elongation stress is the stress achieved at a specific elongation. Elongation is the deformation caused by tensile stress expressed as a percentage of the ratio of the elongation increment to the original length. Elongation at break is the elongation at break.

In addition, we also need to consider the basic properties of silicone seals. Hardness is the performance of rubber’s ability to resist external pressure. The hardness of rubber is partly related to other properties. For example, the adhesive has high hardness, high strength, low elongation, good wear resistance and poor low temperature resistance. High hardness rubber resists crushing and damage under high pressure. Therefore, the appropriate hardness should be selected according to the working characteristics of the parts.