MG Chemicals 422B-340G, Silicone Modified Conformal Coating, 12oz Aerosol, Case of 10

MG Chemicals 422B-340G — Silicone Modified Conformal Coating | 12oz Aerosol, Case of 10

MG Chemicals 422B is a silicone modified conformal coating delivering superior moisture, humidity, and thermal resistance compared to standard acrylic conformal coatings. Formulated for electronics operating in harsh, high-humidity, or thermally demanding environments, the 422B combines the flexibility and wide temperature tolerance of silicone chemistry with strong dielectric protection. UV fluorescent for easy coverage inspection under blacklight. Compliant with IPC-CC-830 and passes MIL-I-46058C laboratory tests. RoHS compliant.

The 422B-340G is the 12oz (340g) aerosol format, sold as a case of 10 — ideal for low-to-medium volume production, rework coating programs, and bench-top application.

Specifications

Key Features

• Silicone modified chemistry — superior moisture and humidity resistance vs. standard acrylic conformal coatings; ideal for high-humidity and outdoor-adjacent environments
• Wide operating temperature range — silicone chemistry provides thermal stability across a broad temperature range beyond typical acrylic coatings
• UV fluorescent — enables fast inspection of coating coverage under UV/blacklight to identify gaps, thin areas, or missed components
• IPC-CC-830 & MIL-I-46058C compliant — meets industry and mil-spec adjacent testing standards
• RoHS compliant — suitable for lead-free and environmentally restricted assemblies
• Case of 10 aerosol format — economical bulk packaging for production and rework programs

Industries & Applications

• Electronics manufacturing — PCB protection in high-humidity and thermally demanding production environments
• Automotive electronics — ECU, sensor module, and underhood assembly protection
• Industrial controls — protection for control boards in harsh or wet environments
• Outdoor and signage electronics — moisture-resistant coating for assemblies exposed to ambient humidity
• Rework and repair — field and bench rework coating for localized PCB protection

Frequently Asked Questions

What is the difference between MG Chemicals 422B silicone and 419D acrylic conformal coating?

The 422B silicone modified coating offers superior moisture resistance, wider operating temperature range, and greater flexibility than the 419D acrylic. However, silicone coatings are significantly harder to remove for rework. Choose 422B for harsh or high-humidity environments where long-term protection is the priority; choose 419D where frequent rework or easy removal is required.

Is MG Chemicals 422B UV fluorescent?

Yes. The 422B contains UV fluorescent additives that allow inspection of coating coverage under a UV/blacklight lamp after application, making it easy to identify uncoated or thin areas on a finished PCB assembly.

Can 422B silicone conformal coating be removed for rework?

Silicone conformal coatings are among the more difficult coating types to remove. Specialized silicone strippers or mechanical removal (scraping, micro-blasting) are typically required. If frequent rework is anticipated in your process, an acrylic coating such as MG Chemicals 419D may be a better fit.

How does 422B compare to a pure silicone conformal coating like Techspray Fine-L-Kote SR?

MG Chemicals 422B is a silicone modified coating, blending silicone chemistry with other resins for a balance of moisture resistance, flexibility, and improved adhesion vs. pure silicone. Pure silicone coatings (like Techspray 2102) offer maximum temperature resistance (up to 200°C) and vibration resistance but are even more difficult to rework. The 422B is a good middle-ground option for applications needing better-than-acrylic moisture protection without fully committing to pure silicone rework challenges.

What is included in a case of MG Chemicals 422B-340G?

Each case contains 10 × 12oz (340g) aerosol cans of MG Chemicals 422B silicone modified conformal coating, ready for aerosol spray application.