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SHIN-ETSU KE-3494 RTV Silicone Sealant for Electronics and Form-in-Place Gasketing
SHIN-ETSU KE-3494 RTV Silicone Sealant for Electronic Protection
SHIN-ETSU KE-3494 RTV Silicone Sealant is a one-component, room-temperature-curing material designed for electronic sealing and form-in-place gasketing. Its gray, self-leveling consistency flows into small spaces and around component profiles before curing into a tough, durable elastomer. The neutral condensation-cure system is low odor and non-corrosive. It also provides excellent unprimed adhesion to many metals, plastics, glass, and ceramics.
Because resin and hardener mixing is not required, the product can simplify manual and automated dispensing. Operators can apply a controlled bead directly to the required area, reducing mixing errors and preparation waste. Its self-leveling behavior is useful for shallow sealing areas, irregular gasket paths, electronic housings, and assemblies where the silicone must spread evenly before forming a flexible protective layer.
Key Benefits of SHIN-ETSU KE-3494 RTV Silicone Sealant
SHIN-ETSU KE-3494 RTV Silicone Sealant combines flame resistance, electrical insulation, flexible performance, and convenient one-part processing. Shin-Etsu identifies the product as UL 94 V-0 certified and confirms that low-molecular-weight siloxanes have been stripped from the formulation. This makes it particularly valuable for sensitive electronics where controlling volatile siloxane contamination may be important.
Typical uncured properties include a density of approximately 1.40 g/cm³ at 23°C and a viscosity of about 50 Pa·s. Under the manufacturer’s published conditions, the material has a tack-free time of approximately eight minutes and is evaluated after seven days of curing at 23°C and 50% relative humidity. Actual curing will vary with temperature, humidity, bead dimensions, airflow, and joint geometry.
After curing, the silicone has a typical Shore A hardness of 35, tensile strength of approximately 2.50 MPa, elongation of about 250%, and shear strength near 1.50 MPa. This balance allows the cured elastomer to remain flexible enough to accommodate vibration, impact, and thermal movement while maintaining useful component retention and sealing performance.
Published electrical properties include a dielectric strength of approximately 25 kV/mm, volume resistivity of 3.0 TΩ·m, and dielectric constant of 3.5 at 50 Hz. Thermal conductivity is approximately 0.42 W/m·K, while the listed usable temperature range is from -40°C to 180°C. These values are representative and should not be treated as guaranteed design specifications.
Applications for SHIN-ETSU KE-3494 RTV Silicone Sealant
SHIN-ETSU KE-3494 RTV Silicone Sealant is officially recommended for sealing electronics and creating form-in-place gaskets. It may be evaluated for circuit-board areas, power supplies, sensors, connectors, LED modules, electronic housings, control units, motors, and other assemblies requiring flame-retardant and non-corrosive protection.
Its adhesion to different substrate families also supports mixed-material assemblies. The flexible cured layer can help accommodate movement between materials with different thermal-expansion rates. Product suitability depends on substrate composition, surface coating, joint design, contamination, bead thickness, curing conditions, and the final service environment.
How to Apply SHIN-ETSU KE-3494 RTV Silicone Sealant
Before applying the product, remove oil, grease, dust, moisture, release agents, oxide, and loose contamination from every contact surface. Dispense a continuous bead into the required sealing or gasketing area and allow the silicone to level naturally. Complete component positioning or joint tooling before significant skin formation.
Because SHIN-ETSU KE-3494 RTV Silicone Sealant cures through atmospheric moisture, thin and exposed sections generally cure faster than thick or enclosed areas. Keep the assembly stable while curing and avoid premature electrical testing, thermal cycling, pressure exposure, or mechanical loading. For consistent production, standardize bead dimensions, dispensing speed, surface preparation, ambient conditions, fixture time, and cure duration.
Storage and Safety of SHIN-ETSU KE-3494 RTV Silicone Sealant
Store the material in its original sealed packaging according to the current product label, technical data sheet, and safety data sheet. Protect opened containers from unnecessary moisture exposure, keep dispensing equipment clean, and use suitable ventilation and personal protective equipment.
For manufacturers seeking a gray, flame-retardant RTV for reliable electronic protection, SHIN-ETSU KE-3494 RTV Silicone Sealant offers self-leveling application, low odor, non-corrosive curing, strong multi-material adhesion, and durable electrical insulation. Explore our industrial RTV silicone sealants for additional electronics, gasketing, component-fixing, and environmental-sealing solutions.
