MG Chemicals 422B-4L, Silicone Modified Conformal Coating, 1 Gallon Can, Case of 1
MG Chemicals 422B-4L Silicone Modified Conformal Coating, 1 Gallon
MG Chemicals 422B is a 1-part acrylic-silicone blend conformal coating that cures to a durable, flexible, and smooth finish. Designed for applications requiring both high service temperature and flexibility, it puts minimum stress on components during thermal cycling — making it ideal for wide temperature range environments. Fluoresces under UV-A light for easy inspection.
Key Specifications
| Specification | Value |
|---|---|
| Part Number | 422B-4L |
| Type | Acrylic-silicone blend (1-part) |
| Volume | 3.78 L (1 gallon) |
| Tack-Free Time | ~8 minutes |
| Dry Time | 20 min at 65°C (149°F) |
| Max Service Temperature | 200°C |
| UV Fluorescence | Yes — fluoresces under UV-A light |
| Flame Rating | UL94 V-0 (File# E203094) |
| Compliance | IPC-CC-830, UL94 V-0 |
| Application Methods | Brush, spray, dip, selective robotic coating |
| Removable | Yes — with appropriate strippers or solder-through rework |
Key Features
- UL94 V-0 Certified — File# E203094
- High service temperature — rated to 200°C continuous
- Fast cure — tack-free in ~8 minutes; dry in 20 min at 65°C
- UV fluorescent — fluoresces under UV-A light for inspection verification
- Validated for selective robotic coating equipment
- Excellent corrosion resistance — protects against moisture, fungus, dirt, dust, thermal shock, short circuits, and static discharge
- Reworkable — can be removed with strippers or soldered through for repair
Frequently Asked Questions
What is the difference between 422B and standard acrylic conformal coatings?
422B is a silicone-modified acrylic, giving it a higher service temperature (200°C) and greater flexibility than standard acrylic coatings. It is better suited for applications with wide thermal cycling ranges or elevated operating temperatures.
Does 422B fluoresce under UV light?
Yes — 422B fluoresces under UV-A light, making it easy to verify coverage and inspect for missed areas or holidays during production.
Can 422B be used with selective robotic coating equipment?
Yes — 422B has been validated for selective robotic coating equipment, making it suitable for automated production lines.
Is 422B reworkable?
Yes — it can be removed with appropriate MG Chemicals strippers, or soldered through for component-level repair and rework.
What surfaces does 422B protect against?
422B protects PCBs and electronic assemblies against moisture, corrosion, fungus, dirt, dust, thermal shock, high-voltage arcing, and static discharge.
Technical Data Sheet (TDS) | Safety Data Sheet (SDS)
California Prop 65 Warning: This product can expose you to chemicals including ethylbenzene, which is known to the State of California to cause cancer, and toluene, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
