In the industrial production of silicone rubber and materials science, raw silicone rubber and mixed silicone rubber are two foundational yet distinctly different concepts. Understanding their differences is crucial for mastering the manufacturing of rubber products. Raw silicone rubber can be viewed as the "raw flour" of silicone rubber; it is a base polymer composed of high-molecular-weight polysiloxanes. Typically possessing a linear structure, the molecular chains of raw silicone rubber have not yet formed a stable three-dimensional network. Therefore, while it has a certain degree of elasticity and flexibility, it suffers from low mechanical strength and lacks thermal stability, making it unsuitable for direct molding and processing. It serves merely as the starting point for producing various silicone rubber products and must undergo complex subsequent processes to be transformed into a material of practical value.

In contrast, mixed silicone rubber is the "mature dough" resulting from the deep processing of raw silicone rubber. During the mixing process, raw silicone rubber is placed on professional rubber mixing machines and uniformly blended with white carbon black (as a reinforcing agent), silicone oil, vulcanizing agents, and various functional additives. This process not only ensures the perfect dispersion of fillers and additives within the raw silicone matrix but also facilitates the formation of robust cross-linked network structures between molecular chains during the subsequent vulcanization stage. It is precisely this qualitative change in microscopic structure that endows mixed silicone rubber with exceptional mechanical properties, such as extremely high tensile strength, tear resistance, as well as superior heat resistance and chemical corrosion resistance.

From an application perspective, their roles are also entirely different. Raw silicone rubber primarily serves as a base raw material used for producing mixed silicone rubber or liquid silicone rubber, and is rarely used directly as an end product. Mixed silicone rubber, however, is a semi-finished product ready for molding and processing. Through processes such as extrusion, compression molding, or injection molding under high temperature and pressure, it solidifies into the final rubber products. Whether it is sealing components in the electronics industry, silicone tubes in the automotive sector, or key accessories in medical equipment, they are all processed from mixed silicone rubber. Therefore, while raw silicone rubber determines the fundamental chemical characteristics of the silicone, the formulation and processing of mixed silicone rubber directly dictate the physical strength and service life of the final product.

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