MG Chemicals 419D-20L, Acrylic Conformal Coating, 20L Pail, Case of 1
MG Chemicals 419D-20L, Acrylic Conformal Coating, 20L Pail, Case of 1
MG Chemicals 419D-20L is a one-part acrylic conformal coating that forms a durable, flexible, smooth protective finish on printed circuit boards. It creates a moisture barrier for electronics used in humid environments and fluoresces under UV-A light to assist coating inspection. This listing is one pail with manufacturer-specified net contents of 18.9 L / 17.3 kg.
Package-size clarification: 419D-20L is the manufacturer's part number and the existing title uses “20L.” The current manufacturer packaging table specifies 18.9 L net contents. Net weight is not packaged shipping weight.
Best Uses / Applications
- Electronics assembly operations requiring a repairable acrylic moisture barrier.
- PCB protection against humidity, corrosion, fungus, dirt and dust.
- Production coating by qualified spray, dip or selective-coating processes.
- Brush-applied touch-ups and rework on compatible circuit-board assemblies.
- Inspection workflows that use UV-A fluorescence to help assess coating coverage.
MG Chemicals also describes protection against thermal shock, short circuits, high-voltage arcing and static discharge. These are coating-performance descriptions, not a guarantee of whole-assembly performance or a replacement for an ESD-control program. Validate coverage, cure and electrical suitability for the application.
Key Features
- One-part acrylic system, with no two-part mixing step.
- Clear/amber cured finish that fluoresces under UV-A light.
- Typical dry-to-handle time of 10 minutes for one coat and 20 minutes for two coats.
- Reworkable: may be removed using appropriate strippers or soldered through, per manufacturer guidance.
- Manufacturer lists UL 94 V-0, file E203094, and IPC-CC-830B certification.
- Xylene- and toluene-free formulation, per current TDS.
- Suitable for selective coating equipment; the TDS provides example PVA and Nordson ASYMTEK settings that require process validation.
Technical Specifications
| Manufacturer / part number | MG Chemicals / 419D-20L |
|---|---|
| Binder system | Acrylic, one part |
| Net contents | 18.9 L / 17.3 kg |
| Sales package | One pail, case of 1 |
| Recommended film thickness | 25–75 µm |
| Minimum recoat time | 3 minutes |
| Dry to handle | 10 minutes, one coat; 20 minutes, two coats |
| Room-temperature cure | 24 hours |
| Density | 0.9 g/mL |
| Viscosity at 25°C | 115 cP |
| Solids content | 30% |
| Calculated VOC | 645 g/L |
| Cured color | Clear, amber |
| Service temperature range | -65 to 125°C |
| Chemical resistance | Poor, per TDS |
| Shelf life | 5 years, per TDS |
| Storage | -5 to 27°C, dry and away from sunlight |
| Manufacturer-listed ratings | UL 94 V-0, file E203094; IPC-CC-830B |
These are manufacturer-listed coating properties, not a certification of the customer's finished assembly. Review the TDS and applicable qualification requirements for your process.
419D Size Comparison
| Part number | Manufacturer net volume | Net weight | Format |
|---|---|---|---|
| 419D-55ML | 55 mL | 50.6 g | Bottle |
| 419D-1L | 945 mL | 869 g | Can |
| 419D-4L | 3.78 L | 3.47 kg | Can |
| 419D-20L | 18.9 L | 17.3 kg | Pail, this listing |
| 419D-340G | 410 mL | 340 g | Aerosol |
This table compares manufacturer packaging, not the case quantities of other listings. Aerosol application and safety documentation differ from the liquid product. Pen products require their own specifications and are not covered by this liquid-pail description.
Application and Cure
Read the liquid SDS before use. The TDS recommends cleaning the substrate so that oils, dust and other residues are removed. It identifies 4352 Thinner 2 when thinning is required; dilution depends on the application method. Brush touch-ups generally do not require thinning. Dip, spray and selective-coating processes must be set up and validated for the actual equipment and assembly.
Allow 24 hours at room temperature for cure. For the TDS heat-cure options, first allow a 10-minute room-temperature rest, then use 30 minutes at 65°C, 20 minutes at 80°C, 10 minutes at 100°C or 5 minutes at 120°C. Confirm the assembly can tolerate the selected schedule. Handling time is not the same as full cure.
Safe Handling
The liquid SDS identifies highly flammable liquid and vapor, serious eye irritation, and possible drowsiness or dizziness. Use adequate ventilation and the specified protective equipment; avoid breathing vapors or spray. Keep away from ignition sources, keep the container tightly closed, and follow grounding, bonding and static-discharge precautions. Do not interpret the cured coating's flame rating as meaning the uncured liquid is non-flammable.
Frequently Asked Questions
Does 419D-20L contain 20 liters?
The current manufacturer table specifies 18.9 L net contents for part number 419D-20L. This listing contains one pail.
Is the coating fully cured in 10 minutes?
No. Ten minutes is the typical handling time for one coat. The TDS specifies a 24-hour room-temperature cure or its stated accelerated heat-cure schedules.
How thick should the coating be?
The TDS recommends a film thickness of 25–75 µm. Verify actual coating coverage and thickness within your qualified process.
Can I inspect it under UV light?
Yes. MG Chemicals states that 419D fluoresces under UV-A light to aid inspection. Fluorescence alone does not establish correct thickness or complete protection.
Can the coating be repaired or removed?
The manufacturer describes solder-through rework and removal with suitable strippers. Existing family guidance names 435 Thinner, 8309 and 8310A for removal; confirm the current remover instructions and substrate compatibility. Application thinning uses 4352 Thinner 2 according to the current liquid TDS.
Is it highly resistant to chemicals?
No. The TDS rates chemical resistance as poor. Do not select it solely on its moisture-barrier performance when significant chemical exposure is expected.
Does UL 94 V-0 mean the liquid cannot burn?
No. The listed coating rating does not cancel the liquid SDS's highly flammable classification. Follow all handling and curing precautions.
Can it be used with automated coating equipment?
The TDS supports selective-coating use and provides example PVA and Nordson ASYMTEK setups. Those settings are starting recommendations, not guaranteed settings for every machine or assembly.
Manufacturer Video
This video is linked from MG Chemicals' 419D product page. Follow the liquid TDS for this pail and use format-specific instructions for other packaging.
Technical and Safety Documents
419D Liquid Technical Data Sheet
419D Liquid Safety Data Sheet, version 9.01
