MG Chemicals 419D-4L, Acrylic Conformal Coating, 1 Gallon Can, Case of 1
MG Chemicals 419D-4L, Acrylic Conformal Coating, 1 Gallon Can, Case of 1
MG Chemicals 419D-4L is a fast-drying, one-part acrylic conformal coating that cures to a durable, flexible and smooth clear/amber finish. It forms a moisture barrier for printed circuit boards in humid environments and fluoresces under UV-A light to assist coverage inspection. This listing contains one can with 3.78 L net volume and 3.47 kg net weight.
The manufacturer's protection claims include humidity, condensation, corrosion, fungus, dirt, dust, thermal shock, short circuits, high-voltage arcing and static discharge. Actual protection depends on preparation, coverage, thickness and cure; the coating does not replace an ESD-control program or certify the completed assembly.
Key Specifications
| Specification | Value |
|---|---|
| Part number | 419D-4L |
| Chemistry | One-part acrylic |
| Net volume | 3.78 L, approximately 1 US gallon |
| Net weight | 3.47 kg |
| Packaging | One can, case of 1 |
| Dry to handle | 10 minutes for one coat; 20 minutes for two coats |
| Room-temperature cure | 24 hours |
| Heat cure | After a 10-minute room-temperature rest: 30 minutes at 65°C, 20 minutes at 80°C, 10 minutes at 100°C or 5 minutes at 120°C |
| Minimum recoat time | 3 minutes |
| Recommended film thickness | 25–75 µm |
| UV fluorescence | UV-A |
| Manufacturer-listed certifications | UL 94 V-0, file E203094; IPC-CC-830B |
| Formulation | Xylene- and toluene-free, per current TDS |
| Selective coating | TDS provides example PVA and Nordson ASYMTEK settings; validate for your equipment |
| Service temperature | -65 to 125°C |
| Chemical resistance | Poor, per TDS |
| Storage / shelf life | -5 to 27°C, dry and away from sunlight / 5 years, per TDS |
Net weight is not packaged shipping weight. Listed coating ratings are not certification of the customer's finished assembly.
Key Features
- Rapid handling: one coat typically dries to handle in 10 minutes; this is not full cure.
- Manufacturer-listed UL 94 V-0 and IPC-CC-830B certification.
- UV-A fluorescence supports coverage inspection, but does not alone verify film thickness.
- Current TDS states xylene- and toluene-free formulation. This does not establish blanket compliance with every facility's HAP requirements.
- Reworkable by solder-through repair or removal with suitable strippers. Existing family guidance names 435 Thinner, 8309 and 8310A; check current remover instructions and substrate compatibility.
- Moisture-barrier protection for properly prepared and coated PCBs.
- Selective-coating compatibility with process-specific setup and validation.
Best Uses / Applications
- Moisture-barrier coating for consumer, industrial and commercial electronics.
- PCB protection in humid environments, subject to application qualification.
- Selective coating on automated production lines.
- Applications specifying the manufacturer's listed coating ratings, with finished-assembly qualification as required.
- Boards requiring repairable coating or solder-through rework.
For significant chemical exposure, do not assume moisture protection implies chemical resistance: the TDS rates chemical resistance as poor.
Size Selection
| Part number | Manufacturer net volume | Format |
|---|---|---|
| 419D-55ML | 55 mL | Bottle |
| 419D-1L | 945 mL | Can |
| 419D-4L | 3.78 L | Can, this listing |
| 419D-20L | 18.9 L | Pail |
| 419D-340G | 410 mL / 340 g | Aerosol |
Other listings have their own case quantities. Aerosols and pens require format-specific documentation; this page covers liquid coating.
Application and Safe Handling
Clean the substrate to remove oils, dust and other residues before coating. The current liquid TDS specifies 4352 Thinner 2 when application thinning is required; brush touch-ups generally do not require thinning. Follow the method-specific TDS instructions for spray, dip or selective coating, and verify the assembly tolerates the chosen cure schedule.
The liquid SDS identifies highly flammable liquid and vapor, serious eye irritation, and possible drowsiness or dizziness. Keep away from ignition sources, provide suitable ventilation, avoid breathing vapors or spray and use the specified protective equipment. Follow grounding, bonding and static-discharge precautions. A cured coating's UL flame rating does not mean the uncured liquid is non-flammable.
Frequently Asked Questions
How quickly can 419D be handled?
The current TDS lists 10 minutes for one coat and 20 minutes for two coats. Handling time is separate from full cure.
What is the full cure schedule?
Allow 24 hours at room temperature, or use a listed heat-cure schedule after a 10-minute room-temperature rest. One option is 30 minutes at 65°C. Confirm equipment and assembly suitability before heat curing.
Can it be soldered through for rework?
Yes, the manufacturer describes solder-through repair. Suitable strippers can also be used when removal is needed; confirm compatibility with the substrate and other materials.
Is it suitable for automated selective coating?
Yes. The TDS provides example PVA and Nordson ASYMTEK setups. Validate settings for the exact equipment, assembly and required film thickness.
Does the current TDS establish blanket HAP-free compliance?
No blanket facility-compliance claim is made here. The current TDS explicitly states xylene- and toluene-free formulation. Obtain the documentation needed for your particular process requirements.
How much coating is in this can?
Part number 419D-4L contains 3.78 L net, approximately one US gallon. This listing contains one can.
Is it chemically resistant?
The current TDS rates chemical resistance as poor. Evaluate expected chemical exposure separately from moisture protection.
Which thinner is used for application?
The current liquid TDS specifies 4352 Thinner 2 when thinning is needed. Do not confuse application-thinning instructions with coating-removal recommendations.
Manufacturer Video
This video is linked from MG Chemicals' 419D page. Follow the current liquid instructions for this product.
Technical and Safety Documents
419D Liquid Technical Data Sheet | 419D Liquid Safety Data Sheet, version 9.01
