Solid silicone rubber and liquid silicone rubber differ significantly in morphology, curing mechanism, and application performance. Solid silicone rubber usually exists in block or granular form and requires high-temperature vulcanization to achieve cross-linking. The curing process may involve peroxide or platinum catalytic systems and requires a relatively long time to complete the connection of molecular chains. After curing, it forms a high-hardness, wear-resistant elastomer, which is often used in applications requiring high mechanical strength, such as gaskets and push-button switches.



Liquid silicone rubber is in the form of a low-viscosity fluid and can be directly molded through injection molding or coating processes. Its curing mechanism is mostly based on platinum-catalyzed addition reaction, which can quickly complete cross-linking at room temperature or medium temperature without the need for long-term high-temperature treatment. Some types even eliminate the need for secondary vulcanization. After curing, it has high transparency, low volatile organic compound content and excellent biocompatibility. It is widely used in fields with strict requirements for purity and safety, such as baby care products, medical catheters, and electronic packaging.

In terms of physical properties, liquid silicone rubber typically offers a wider range of hardness adjustment, from ultra-soft to high hardness, and exhibits superior elastic recovery. Solid silicone rubber, on the other hand, demonstrates greater stability in high-temperature resistance and chemical corrosion resistance, making it suitable for high-temperature industrial environments or contact with highly corrosive media. The two also differ significantly in their processing technologies. Liquid silicone rubber is better suited for automated production lines, such as precision injection molding, enabling the efficient production of complex structural parts. Solid silicone rubber, however, is primarily used in compression molding or extrusion molding, making it suitable for mass production of standard-sized products.

With increasing demands for environmental protection and high performance, liquid silicone rubber has shown greater adaptability in the field of sustainable development due to its low energy consumption, low emission characteristics and potential as a substitute for bio-based raw materials, while solid silicone rubber continues to occupy an important position in traditional industrial applications thanks to its mature processes and cost advantages.