The ISO 18473-3-2018 standard specifies requirements and test methods for fumed silica used in silicone rubber applications. Fumed silica, as an important filler, is widely used in the production of silicone rubber to improve its physical properties and performance. The standard describes in detail the specifications of fumed silica, including its purity, Particle size distribution and Miscellaneous key performance indicators. This standard provides the silicone rubber industry with standardized test methods to ensure that the mass of fumed silica meets the application requirements, thereby improving the overall performance and Reliability of the product.