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Silicone rubber is a high-performance synthetic elastomer composed of silicone and other molecules (e.g., carbon, hydrogen, and oxygen). It is characterized by high viscosity and elasticity, as well as superior abrasion resistance, chemical stability, insulating properties, heat and cold temperature resistance, and weatherability compared to organic rubber.
Key Properties of Silicone Rubber
Operating temperature range: -100°C to 350°C (depending on exposure duration)
Excellent weatherability: resistant to wind, rain, UV radiation, and ozone
Moisture resistance: only 1% water absorption in cold, warm, and boiling water
Steam resistance: indefinite resistance to unpressurized steam
Chemical resistance: withstands oils, solvents, polar organic compounds, and diluted acids/alkalis
Electrical insulation: 1TΩ*m-100TΩ*m across wide temperature and frequency ranges
Thermal conductivity: 0.2 W/mΩ*K
Compression set: consistent performance from -60°C to 250°C
Tear strength: 9.8 kN/m
Types of Silicone Rubber
Silicone rubber formulations vary based on molecular structure and form, categorized primarily by viscosity and processing method:
Solid Silicone Rubber (HTV): Long polymer chains with high molecular weight, processable by conventional rubber methods
Liquid Silicone Rubber (LSR): Short polymer chains with lower molecular weight, requiring specialized injection molding
Room Temperature Vulcanized (RTV) Rubber: One- or two-component system used for sealing, encapsulation, and potting
Industrial Applications
Silicone rubber's exceptional properties make it indispensable across multiple industries:
Aerospace components (e.g., space suit elements)
Automotive gaskets and seals
Construction coatings and sealants
Electrical/electronic adhesives and encapsulants
Food processing molds
Medical instrument components (seals, tubes, valves)
Recreational equipment (goggles, mouthpieces)
Liquid vs. Solid Silicone Rubber
Key differences between LSR and solid silicone rubber:
Solid Silicone: Lower fluidity, cost-effective processing with conventional equipment
Silicone rubber's durability, flexibility, and environmental resistance make it essential for applications ranging from automotive components to medical devices and advanced communication systems.