Addition-cure liquid silicone rubber (ALSR) is a high-performance polymeric material that has gained widespread recognition in various industrial fields. Fundamentally, it is formulated as a paste-like compound, with vinyl-terminated polydimethylsiloxane serving as the base polymer, combined with specialized cross-linking agents and catalysts. This unique composition endows ALSR with exceptional properties such as excellent flexibility, thermal stability, and chemical resistance, making it a preferred choice for applications requiring precision and reliability. Unlike other types of silicone rubbers, the curing process of ALSR proceeds through an addition reaction, which is characterized by low shrinkage, no by-product release, and the ability to cure at both room temperature and elevated temperatures, thus enhancing its adaptability in different manufacturing scenarios.
The classification of addition-cure silicone rubber is primarily based on two key criteria: product type and performance/application. From the perspective of product type, it can be divided into solid silicone rubber and liquid silicone rubber. Among them, liquid silicone rubber, especially the addition-cure type, stands out for its fluidity before curing, which allows it to be easily injected into complex molds, enabling the production of intricate and high-precision components. In terms of performance and application, ALSR is categorized into general-purpose type and low-temperature resistant type. General-purpose ALSR meets the basic requirements of most industrial applications, such as sealing, bonding, and molding, while low-temperature resistant ALSR is specifically designed to maintain its flexibility and mechanical properties in harsh low-temperature environments, making it suitable for applications in aerospace, automotive, and refrigeration industries where low-temperature stability is crucial.
Several common types of addition-cure silicone rubbers are widely used in industrial production, with dimethyl silicone rubber and methyl vinyl silicone rubber being the most representative. Dimethyl silicone rubber, known for its excellent electrical insulation, weather resistance, and chemical inertness, is extensively applied in the electronics and electrical industries for manufacturing insulators, gaskets, and protective covers. Methyl vinyl silicone rubber, on the other hand, has enhanced vulcanization properties and mechanical strength due to the introduction of vinyl groups, which make it more suitable for applications requiring higher tensile strength and tear resistance, such as automotive seals, medical devices, and food-grade components. With the continuous advancement of industrial technology, the application scope of addition-cure liquid silicone rubber is expanding, and its unique combination of properties will continue to drive innovation in various high-tech fields.
Post time: Dec-24-2025