Overview
Solid silicone rubber is a synthetic elastomer derived from silicone polymers, characterized by its exceptional thermal stability, flexibility, and biocompatibility. Unlike liquid silicone rubber (LSR), it is supplied in pre-cured solid forms, such as sheets or molded parts, and is widely used in demanding industrial and consumer applications. Its cross-linked molecular structure ensures resistance to deformation, UV radiation, and extreme temperatures (-60°C to +250°C). This makes it a preferred material for sealing, insulation, and medical devices where durability and safety are critical.
Physical and Chemical Properties
Solid silicone rubber exhibits a unique combination of physical and chemical properties. It maintains elasticity across a broad temperature range and resists oxidation, ozone, and weathering. Its low compression set ensures long-term performance in dynamic applications like gaskets. Chemically, it is inert to water, alcohols, and weak acids but may swell in hydrocarbons or ketones. The material is non-conductive and meets flammability standards (e.g., UL 94 V-0). Grades with added fillers (e.g., silica) enhance tensile strength (up to 12 MPa) and tear resistance.
Main Applications
In industrial settings, solid silicone rubber is used for seals in automotive engines, aerospace components, and electrical insulators due to its heat resistance. The medical sector relies on its biocompatibility for tubing, prosthetics, and surgical instruments. Consumer applications include bakeware, baby products, and waterproof seals for electronics. Food-grade variants (FDA-compliant) are common in kitchen utensils. Specialty grades with pigments or additives cater to custom designs, such as wearable tech or ergonomic grips.
Safety and Storage
Solid silicone rubber is generally safe, with no known toxicity under normal use. However, dust generated during cutting or grinding may irritate respiratory tracts; proper ventilation or PPE is advised. Avoid prolonged exposure to strong acids/bases or UV light to prevent degradation. Store in original packaging at room temperature (15–25°C) to prevent premature aging. Shelf life typically exceeds 12 months if kept away from ozone sources (e.g., electric motors) and moisture.
B2B Procurement Guide
When sourcing solid silicone rubber, specify key parameters: hardness (commonly 30–80 Shore A), tensile strength, and certifications (e.g., ISO 10993 for medical use). For cost efficiency, bulk purchases (500+ kg) often attract discounts of 10–20%. Verify supplier compliance with RoHS/REACH for EU markets. Sample testing is recommended to confirm performance under intended conditions (e.g., autoclaving for medical parts). Lead times vary from 2–6 weeks for custom formulations.
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