Fire safety is paramount in consumer electronics, white goods, and automotive control modules. This one-part, room-temperature vulcanizing (RTV) silicone rubber is formulated with a non-halogen flame retardant system to achieve UL 94 V-0 certification while delivering strong adhesion to a variety of electronic substrates. It serves as both a protective sealant and a structural bond, simplifying bill-of-materials for power supply units, battery housings, and sensor assemblies.
The sealant cures upon exposure to atmospheric moisture, forming a tough, flexible elastomer from the surface inward. Its squeeze-force-controlled viscosity allows for manual application with standard caulking guns or pneumatic dispensers, creating precise beads and fillets. Tack-free time is typically 10–20 minutes, with full cure through a 2 mm section occurring in 24 hours at 23°C and 50% RH. Unlike acetoxy silicones, this neutral-cure alkoxy system releases alcohol vapor, which is non-corrosive to copper, brass, and other sensitive metals.
Once cured, the silicone offers a Shore A hardness of 30–40, elongation of 300–400%, and a tensile strength above 2.0 MPa, ensuring it moves with the substrate during thermal cycling without cracking or delaminating. It provides excellent electrical insulation (dielectric strength ≥19 kV/mm) and remains flexible from -55°C to 200°C, with short-term excursions to 260°C tolerated during reflow soldering. The flame retardant mechanism actively quenches combustion, and the material will not sustain burning after the ignition source is removed.
In addition to meeting V-0 requirements, this silicone passes common industry standards for outgassing, corrosion, and stress cracking on polycarbonate. It adheres well to metals, glass, many plastics, and PCB laminates without a primer, though a dedicated primer can further boost bond strength on difficult substrates. It is an ideal choice for fixing components, sealing enclosures, reinforcing large capacitors, and protecting wire connections in products that must meet international flammability standards without compromising environmental sustainability.
