Overview
Fully sealed silicone refers to specially formulated silicone rubber compounds designed to create impermeable barriers against moisture, gases, and environmental contaminants. Unlike standard silicone, these formulations undergo additional processing to eliminate microscopic pores, achieving true hermetic sealing capabilities. Developed for critical applications where even minimal permeability is unacceptable, fully sealed silicone maintains all the beneficial properties of conventional silicone rubber - flexibility across wide temperature ranges, chemical stability, and electrical insulation - while providing superior sealing performance. The material finds particular importance in aerospace, medical implant, and high-end electronics applications.
Physical and Chemical Properties
Fully sealed silicone exhibits exceptional thermal stability, maintaining elasticity from -60°C to 250°C continuously, with some specialty grades tolerating brief exposure up to 300°C. Its compression set resistance (typically <20% after 22 hours at 175°C) ensures long-term sealing performance without significant relaxation. The material demonstrates excellent resistance to ozone, UV radiation, and weathering, outperforming organic rubbers in outdoor applications. While resistant to most polar solvents, alcohols, and weak acids/bases, it shows limited resistance to concentrated acids, alkalis, and hydrocarbon solvents. Electrical properties include volume resistivity >10^15 ohm-cm and dielectric strength ~20 kV/mm.
Main Applications
In automotive and aerospace sectors, fully sealed silicone forms critical gaskets for fuel systems, turbochargers, and engine components where hydrocarbon permeation must be minimized. Medical applications include implantable device housings and pharmaceutical seals requiring USP Class VI compliance. The electronics industry utilizes these materials for potting sensitive components, creating moisture barriers for LED arrays, and encapsulating high-voltage insulators. Industrial applications range from vacuum system seals to chemical process equipment gaskets. Recent developments include food-grade formulations for aseptic packaging and silicone-based hermetic seals for renewable energy equipment.
Safety and Storage
While cured fully sealed silicone is generally biologically inert, uncured materials may contain platinum catalysts or other additives requiring proper handling. Always consult the material safety data sheet (MSDS) for specific formulation details. Store rolls or sheets in original packaging at temperatures below 35°C, avoiding contact with sharp objects that could compromise the material's integrity. Shelf life typically exceeds 12 months when stored properly. For molded parts, store in clean, dry conditions away from solvents and oxidizing agents that could cause surface degradation over time.
B2B Procurement Guide
When sourcing fully sealed silicone, clearly specify required certifications (FDA, UL, NSF, MIL-SPEC), color requirements (standard or custom), and dimensional tolerances for pre-formed parts. For sheet material, indicate preferred thickness (commonly 0.5mm-10mm) and roll sizes. Key technical parameters to confirm include hardness (typically Shore A 30-80), tensile strength (4-12 MPa), elongation at break (200-800%), and specific permeability requirements if applicable. Lead times vary significantly between standard formulations (2-4 weeks) and custom compounds (8-12 weeks). For large-volume purchases (>1,000 kg), negotiate bulk pricing and confirm minimum order quantities for specialty grades.
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