Momentive SNAPSIL TN3405-C Silicone Encapsulant Adhesive is a one-component, low-volatility silicone developed for bonding, sealing, and protecting electronic components. The clear, flowable material cures at room temperature when exposed to atmospheric moisture, forming a soft and flexible silicone rubber without requiring mixing or heat. Its fast tack-free performance, low-odor alcohol-cure chemistry, strong electrical insulation, and primerless adhesion to many common substrates make it a practical choice for electronics manufacturers, OEM assembly lines, repair operations, and precision dispensing applications.

Table of Contents

Momentive SNAPSIL TN3405-C Silicone Encapsulant Adhesive Performance

This moisture-curing silicone is engineered to flow around electronic parts and into narrow spaces, helping create uniform coverage around components, terminals, connectors, and assemblies. The published typical viscosity is approximately 30 Pa·s at 23°C, while the tack-free time is about seven minutes under standard laboratory conditions. These characteristics support controlled dispensing and faster handling in production environments where process efficiency and clean application are important.

After curing, Momentive SNAPSIL TN3405-C Silicone Encapsulant Adhesive forms clear elastic rubber with a low Shore A hardness of approximately 17. The flexible material can absorb vibration, mechanical movement, and thermal expansion while reducing stress on delicate assemblies. Typical cured properties include tensile strength of approximately 1.3 MPa and elongation of about 260%, providing a useful balance between strength and flexibility.

Electronic Applications for Momentive SNAPSIL TN3405-C Silicone Encapsulant Adhesive

The product is suitable for electronic encapsulation, component bonding, protective sealing, and localized potting. Typical uses may include sensors, connectors, circuit assemblies, power modules, control units, lighting components, communication devices, automotive electronics, appliances, and industrial equipment. Its transparent appearance supports visual inspection and makes it useful where operators need to see the protected component after application.

Primerless adhesion has been reported on aluminum, copper, glass, phenolic resin, epoxy resin, polyester, ABS, nylon, polycarbonate, and PPO. Adhesion is not recommended for untreated polyethylene or PTFE, so representative testing is essential before production approval. Substrate grade, surface treatment, contamination, joint design, and curing conditions can all influence actual performance.

Key Benefits for Electronics Manufacturing

One-component convenience: No weighing or mixing is required before dispensing.
Fast tack-free time: Supports efficient handling and shorter processing cycles.
Low-volatility formulation: Designed for sensitive electronic assembly environments.
Flexible protection: Helps absorb vibration, thermal movement, and mechanical stress.
Electrical insulation: Provides high volume resistivity and dielectric strength.
Clear appearance: Allows easier visual inspection of covered components.
Broad adhesion: Bonds to many metals, engineering plastics, resins, and glass without primer.

How to Apply Momentive SNAPSIL TN3405-C Silicone Encapsulant Adhesive

Clean all surfaces and remove oil, grease, dust, moisture, flux residue, and release agents before application. Dispense the required amount directly onto the assembly and allow the flowable material to cover the intended area. Cure speed depends on temperature, humidity, layer thickness, and joint geometry because atmospheric moisture must reach the silicone.

For consistent production, control dispensing volume, bead thickness, component spacing, and curing conditions. Test the product on representative parts before full-scale use, especially where plastics, coatings, or sensitive metals are involved. The typical service range for silicone materials may extend from approximately -45°C to 200°C, but long-term performance depends on design stress, substrates, thermal cycling, and operating conditions.

Official Resources and Related Silicone Products

For current technical values, handling guidance, and product documentation, review the official Momentive TN3405 technical data sheet and the Momentive industrial adhesives portfolio. Both external resources use standard DoFollow links because no nofollow attribute is applied.

Explore our electronic silicone adhesives for related bonding and sealing products, or compare our electronic potting compounds for additional encapsulation solutions. Momentive SNAPSIL TN3405-C Silicone Encapsulant Adhesive is commonly supplied in a 333 ml cartridge, subject to regional availability. Contact us for quotations, bulk orders, technical documentation, and export support.