Full definition
A flexible adhesive/sealant based on silicone (polydimethylsiloxane) chemistry that cures at room temperature by reacting with atmospheric moisture (RTV — Room Temperature Vulcanizing). Provides the widest temperature range of any adhesive: -60 to +260°C continuous (specialty grades to +315°C). Curing mechanism: acetoxy (releases acetic acid — vinegar smell, corrosive to copper/brass) or oxime/neutral cure (non-corrosive, slower). Key properties: permanently flexible (excellent joint movement accommodation), outstanding weather/UV/ozone resistance, excellent electrical insulation, biocompatible (many grades are FDA and medical approved), and inherent flame resistance. Limitations: low shear/tensile strength (1-5 MPa — not a structural adhesive), poor adhesion to some plastics without primer, and cannot be painted. Applications: formed-in-place gaskets (replacing die-cut gaskets on engine and equipment covers), flexible joint sealing (construction, HVAC, curtain wall), high-temperature bonding (oven and furnace components), electronics potting and encapsulation, and medical device assembly. Per ASTM C920 (building sealant), MIL-A-46106 (military). Brands: Dow (Dowsil), Momentive (RTV), Loctite (Henkel), Permatex, 3M.