Momentive SILTRUST ECC3051S Silicone Conformal Coating is a one-component, low-viscosity, solvent-free silicone material developed to protect printed circuit boards and sensitive electronic parts from moisture, corrosion, contamination, thermal cycling, and electrical stress. It cures through exposure to atmospheric moisture, forming a flexible translucent coating without requiring mixing or dedicated curing equipment. Fast ambient curing, low volatility, a built-in UV inspection indicator, and strong electrical insulation make it a practical choice for electronics manufacturers, appliance producers, automotive suppliers, industrial control companies, and professional PCB coating operations.

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Momentive SILTRUST ECC3051S Silicone Conformal Coating Performance

The low-viscosity formulation flows easily across circuit-board surfaces and around component leads, helping create uniform thin-film coverage in complex electronic assemblies. Typical viscosity is approximately 550 mPa·s at 23°C and 50% relative humidity. At a coating thickness of about 100 μm, the material typically reaches tack-free condition in approximately five minutes and develops cure in around 30 minutes under standard ambient conditions. Mild heating can accelerate processing, with a published cure time of approximately two minutes at 60°C and 15% relative humidity.

After curing, the coating remains soft and flexible, with a typical Shore A hardness of 22. This elasticity helps reduce mechanical stress during vibration, movement, and repeated temperature changes. Typical electrical properties include dielectric strength of 20 kV/mm, volume resistivity of 1 × 10¹⁵ Ω·cm, dielectric constant of 2.60 at 60 Hz, and dielectric loss of 0.001. These characteristics support dependable insulation around densely arranged PCB components.

PCB Applications for Momentive SILTRUST ECC3051S Silicone Conformal Coating

This coating is designed for conformal protection of electrical and electronic parts, moisture-proof coating of circuit boards, and thin-section potting. Typical applications include inverter boards, HVAC control boards, automotive electronics, power supplies, sensors, communication equipment, industrial controllers, home appliances, lighting modules, chargers, and other assemblies exposed to humidity or corrosive environments.

The formulation contains a UV indicator that fluoresces under black light, helping quality-control teams verify coating presence and coverage during inspection. Its translucent appearance also allows visual examination of components after curing. Momentive reports performance testing for salt spray according to IEC 60068-2-52 Severity 5 and mixed-gas corrosion according to IEC 60068-2-60 Method 4.

7 Key Commercial Benefits

One-component system with no weighing or mixing required.
Solvent-free formulation with 100% solid content.
Fast tack-free performance for efficient PCB production.
UV indicator for convenient black-light inspection.
Flexible coating for vibration and thermal-cycle resistance.
UL 94 V-0 flame-retardant certification under File E135148.
Tested against IPC-CC-830B and MIL-I-46058C requirements.

How to Apply Momentive SILTRUST ECC3051S Silicone Conformal Coating

Clean the substrate thoroughly before coating and remove oil, flux residue, dust, moisture, and other contaminants. Suitable cleaning solvents may include alcohol or other approved production cleaners, depending on component compatibility. Apply the material by controlled dispensing, brushing, spraying, or another validated coating method. Maintain uniform thickness and allow sufficient exposure to atmospheric moisture during curing.

For reliable production, validate coating thickness, masking procedures, cure conditions, component compatibility, inspection methods, and rework requirements with representative assemblies. Operators should use appropriate eye protection, gloves, and ventilation and review the latest safety data sheet before handling.

Official Resources and Related PCB Protection Products

Review the official Momentive SILTRUST ECC3051S product page and the official Momentive ECC3051S technical data sheet for current performance data, packaging, and safety guidance.

Explore our PCB conformal coatings for additional moisture and corrosion protection solutions, or compare our electronic potting compounds for deeper encapsulation applications. Available industrial packaging includes 1 kg cans, 18 kg pails, and 18 kg bladder packs, subject to regional availability. Contact us for quotations, bulk supply, export documentation, and technical product matching.