MG Chemicals 419E-20L, Premium Acrylic Conformal Coating, 20L Pail, Case of 1
MG Chemicals 419E-20L, Premium Acrylic Conformal Coating, 20L Pail, Case of 1
MG Chemicals 419E-20L is a one-part acrylic conformal coating supplied in a pail for higher-volume printed circuit board coating processes. This listing is one pail containing 18.9 L; the 20L designation is the catalog size, not the net fill. The coating cures to a clear, flexible, smooth finish and fluoresces under UV-A light for coverage inspection.
Best Uses / Applications
Choose the pail for production PCB coating, dip tanks and liquid feed systems where larger quantities are appropriate. The liquid supports brush touch-ups, manual spray equipment and selective coating equipment. MG Chemicals provides example settings for PVA and Nordson ASYMTEK platforms; validate dilution, dispensing and cure conditions on the actual assembly before production.
Key Features
- One-part acrylic system with no resin/hardener mixing.
- Moisture barrier for PCBs in humid environments.
- Manufacturer-described protection against corrosion, fungus, dirt, dust, thermal shock, short circuits, high-voltage arcing and static discharge.
- Clear, flexible finish with UV-A fluorescence for inspection.
- Manufacturer-listed UL 746E certification, File E203094, and IPC-CC-830C certification.
- Xylene- and toluene-free formulation, as specified in the liquid TDS.
- Can be removed with appropriate coating strippers or soldered through for repair and rework.
Technical Specifications
| Specification | Detail |
|---|---|
| SKU / packaging | 419E-20L; one pail, case of 1 |
| Net volume | 18.9 L |
| Net weight | Approximately 16.6 kg in current TDS; existing package listing specifies 16.63 kg / 36.6 lb |
| Binder / components | Acrylic; one part |
| Cured color / inspection | Clear; fluoresces under UV-A light |
| Dry time to handle | 15 minutes, one coat; 25 minutes, two coats |
| Minimum recoat time | 3 minutes |
| Recommended film thickness | 25–75 µm |
| Density | 0.9 g/mL |
| Viscosity at 25°C | 160 cP |
| Solids / calculated VOC | 29% / 625 g/L |
| Theoretical coverage at recommended thickness | 93,176 cm²/L; actual coverage depends on process and losses |
| Room-temperature cure | 24 hours |
| Heat-cure options | After a 15-minute room-temperature rest: 30 minutes at 65°C, 15 minutes at 80°C, or 5 minutes at 100°C |
| Service temperature range | −65 to 130°C |
| Volume resistivity | 3.5 × 10¹³ Ω·cm |
| Breakdown voltage / dielectric strength | >1,500 V / 1,100 V/mil |
| Glass transition temperature | 38°C |
| CTE below glass transition | 160 ppm/°C |
| Manufacturer-listed certifications | UL 746E, File E203094; IPC-CC-830C |
| Shelf life / storage | 5 years; −5 to 27°C in a dry area away from sunlight, following the SDS |
| Recommended application thinner | MG Chemicals 4352 Thinner 2 |
Application and Cure Guidance
Remove oils, dust and residues before coating; the TDS recommends MG 824 99.9% isopropyl alcohol. Most brush applications do not require thinning. For manual spraying, the TDS gives a starting dilution of one part coating to one part 4352 thinner, adjusted as required. Apply thin, even coats and wait at least three minutes between coats.
For dip coating, the TDS recommends monitoring viscosity with a Ford or Zahn cup because solvent evaporates over time. Its starting procedure uses a two-minute immersion and withdrawal at approximately six inches per minute. Follow the full TDS and validate the process for the board geometry.
Handling time is not full cure. Allow 24 hours at room temperature, or for general heat-cure planning allow a 15-minute room-temperature rest before a listed oven cycle. Validate component and substrate heat tolerance.
419E Packaging Comparison
| Catalog size | Manufacturer net contents | Selection guidance |
|---|---|---|
| 419E-1L | 945 mL / 830 g per can | Smaller liquid batches; separate case-of-six listing |
| 419E-4L | 3.78 L / 3.32 kg per can | Gallon-size liquid supply |
| 419E-20L, this listing | 18.9 L / approximately 16.6 kg per pail | Higher-volume liquid coating processes |
| 419E-340G aerosol | Separate spray format | Use aerosol-specific TDS and SDS, not liquid instructions |
Frequently Asked Questions
Does this pail contain 20 liters?
No. MG Chemicals specifies 18.9 L net contents for 419E-20L. This listing supplies one pail.
Is it the same coating as the smaller liquid cans?
The 1L, 4L and 20L catalog sizes are covered by the same 419E Liquid TDS. Their net contents and sales quantities differ.
How long does 419E take to cure?
The liquid TDS specifies 24 hours at room temperature. Alternatively, after a 15-minute rest use 30 minutes at 65°C, 15 minutes at 80°C or 5 minutes at 100°C. Single-coat handling time is 15 minutes, not full cure.
Can it be used in a dip tank?
Yes. The TDS includes dip-coating instructions and recommends monitoring viscosity because solvent evaporation changes it over time.
What thinner should I use for application?
The current liquid TDS recommends MG Chemicals 4352 Thinner 2. Dilution depends on the application equipment and desired film.
Can coated boards be reworked?
MG Chemicals states the coating can be removed with appropriate strippers or soldered through. Existing guidance identifies 435, 8309 and 8310A as removal options; verify current remover instructions and substrate compatibility. Application thinning uses 4352 as directed by the liquid TDS.
How do I inspect coverage?
The cured coating fluoresces under UV-A light. The recommended film thickness is 25–75 µm; validate coverage and cure for your process.
Can these specifications be applied to the aerosol?
Do not assume they can. 419E-340G has separate aerosol documentation and application instructions.
Manufacturer Application Video
Technical Documents
Safety Information
The current SDS classifies 419E liquid as highly flammable and identifies serious eye irritation, skin sensitization, respiratory irritation, and drowsiness or dizziness hazards. Read the SDS before use. Use appropriate ventilation, protective equipment and ignition controls.
Existing product warning retained pending label-specific verification: This product can expose you to chemicals including ethylene glycol, 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.
Related Resources
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