MG Chemicals 4228A-1L, Red Insulating Varnish Dielectric Coating, 2 pt. Can, Case of 2
MG Chemicals 4228A-1L Red Insulating Varnish Dielectric Coating — 2pt Can, Case of 2
MG Chemicals 4228A is a one-part, red insulating varnish designed for electrical insulation and dielectric protection of transformers, coils, motor windings, and generator components. A low-viscosity, easy-to-apply coating, it delivers exceptional arc and corona resistance along with Insulation Class H rating — suitable for continuous service up to 180°C. The tough, glossy red finish provides a visual indicator of complete coverage while offering excellent adhesion, moisture resistance, and long-term durability in demanding electrical environments.
Specifications
| Part Number | 4228A-1L |
|---|---|
| Color | Red |
| Volume | 945 mL (1.99 pt) |
| Packaging | Can, Case of 2 |
| Components | 1-part (ready to use) |
| Insulation Class | Class H — 180°C continuous service |
| Dielectric Strength (Dry) | 3,000 V/mil |
| Dielectric Strength (Wet) | 1,500 V/mil |
| Finish | High gloss |
| Flexibility | Tough and flexible when cured |
| Application Method | Brush, dip, or spray |
Key Features
- Class H insulation rating — rated for continuous service up to 180°C, suitable for high-temperature electrical applications
- High dielectric strength — 3,000 V/mil dry, 1,500 V/mil wet for strong electrical isolation
- Excellent arc and corona resistance — protects against electrical discharge damage in high-voltage environments
- 1-part formulation — no mixing required, ready to apply straight from the can
- Low viscosity — penetrates windings and tight spaces for thorough coverage
- Tough, flexible, high-gloss red finish — durable coating with visual coverage confirmation
- Excellent oil and moisture resistance — protects against humidity, moisture ingress, and oil exposure
- Good saltwater resistance — suitable for marine and outdoor electrical equipment
- Broad substrate adhesion — adheres well to copper, aluminum, and common winding materials
Ideal Applications
- Motor winding insulation and protection
- Transformer coil impregnation and sealing
- Generator and alternator component coating
- High-voltage coil and inductance protection
- Arc and corona protection in electrical equipment
- Electrical insulation in marine and outdoor environments
- General dielectric coating for electrical components requiring Class H service
MG Chemicals 4228A — Available Sizes
| SKU | Size | Format | Case Qty | Best For |
|---|---|---|---|---|
| 4228A-55ML | 2 oz (55 mL) | Bottle | Case of 5 | Small jobs, sampling, lab use |
| 4228A-225ML | 8 oz (225 mL) | Can | Case of 5 | Moderate volume, bench use |
| 4228A-1L | 2pt (945 mL) | Can | Case of 2 | Production use, mid-volume — this listing |
| 4228A-4L | 1 Gallon | Can | Case of 1 | High-volume production |
Frequently Asked Questions
What is MG Chemicals 4228A red insulating varnish used for?
MG Chemicals 4228A is used to insulate and protect the windings of motors, transformers, coils, and generators. It provides dielectric isolation, arc and corona resistance, and moisture protection for electrical components operating at high temperatures up to 180°C (Class H rating).
What does "Class H" insulation mean?
Insulation Class H is a thermal classification defined by IEC and NEMA standards for electrical insulating materials. It indicates the material is rated for continuous operation at temperatures up to 180°C. MG Chemicals 4228A meets Class H requirements, making it suitable for high-temperature motors, transformers, and generators.
What is the dielectric strength of 4228A?
4228A has a dielectric strength of 3,000 V/mil when dry and 1,500 V/mil when wet. This high dielectric strength ensures effective electrical isolation between windings and conductive surfaces in high-voltage applications.
How is MG Chemicals 4228A applied?
4228A can be applied by brush, dip, or spray. Its low viscosity allows it to penetrate motor windings and coil assemblies thoroughly. Multiple coats may be applied for increased protection. Allow each coat to dry fully before applying the next.
Is 4228A the same as 4228?
4228A is an updated formulation of the original MG Chemicals 4228 red insulating varnish. The "A" designation indicates the current production version. Both are red, Class H, single-component insulating varnishes with the same general application profile.
Does 4228A require thinning before use?
No — 4228A is a ready-to-use, low-viscosity formulation that does not require thinning under normal conditions. If thinning is needed for spray application, consult the Technical Data Sheet for compatible thinners and dilution ratios.
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