The elastic modulus of silicone rubber is one of the important indexes to evaluate its elastic properties. Elastic modulus refers to the ratio of elastic force to unit area under unit strain, usually expressed by Newton force/square meter per unit area (N/m²), and the elastic modulus of silicone rubber is generally in the range of 0.5-1.5MPa. Compared with other materials, the elastic modulus of silicone rubber is low, which makes it have excellent softness and bending properties, but also makes it has a good ability to absorb shock and vibration.

Hardness refers to the resistance of a material's surface to external forces. The hardness of silicone rubber is generally expressed by "shore A", which is a hardness grade standard for rubber materials. The hardness scale is 0-100, with 0 being the softest and 100 the hardest. The hardness of silicone rubber is generally between 20-90, of which the hardness of silicone rubber used for making seals and other high-demand fields is usually between 40-70 hardness levels.

Elastic modulus and hardness are related to some extent. The elastic modulus and hardness of silicone rubber are both important performance indicators of materials, and their relationship is reflected in the influence of hardness on the elastic modulus. Under normal circumstances, the higher the hardness of silicone rubber, the greater its elastic modulus. Silicone rubber with high hardness has higher stiffness and support capacity, and is suitable for some fields with high structural strength and stability requirements. Therefore, the choice of elastic modulus and hardness needs to be considered according to the specific application field and actual needs.

Silicone rubber can be used to make seals, pipes, waterproof materials, cables, soundproofing pads and other products, and can also be used to make artificial heart valves, artificial joints, medical catheters and other medical devices. Different silicone rubber products need to have different elastic modulus, hardness and other surface characteristics to meet the needs of different application fields. It can be seen that the properties of silicone rubber such as elastic modulus and hardness play a pivotal role in its performance in practical applications.

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