MG Chemicals 4228A-55ML, Red Insulating Varnish Dielectric Coating, 2 oz. Bottle, Case of 5
MG Chemicals 4228A Red Insulating Varnish — 2 oz Bottle, Case of 5
MG Chemicals 4228A is a Class H red insulating varnish and dielectric coating designed to protect and insulate motor windings, transformer coils, and electrical components in demanding high-temperature environments. With a dielectric strength of 3,000 V/mil and a continuous service rating of 180°C (Class H), it provides reliable electrical isolation and mechanical protection against moisture, chemicals, and vibration. The deep red color provides easy visual inspection of coating coverage.
This listing is for the 2 oz (55mL) bottle, sold in a case of 5 — ideal for small-volume applications, spot repairs, and laboratory or prototype use.
Specifications
| Part Number | 4228A-55ML |
|---|---|
| Brand | MG Chemicals |
| Product Type | Red Insulating Varnish / Dielectric Coating |
| Color | Red |
| Dielectric Strength | 3,000 V/mil |
| Temperature Rating | Class H — 180°C (356°F) continuous |
| Arc Resistance | Yes |
| Corona Resistance | Yes |
| Container Size | 2 oz (55 mL) Bottle |
| Case Quantity | 5 bottles per case |
| Application Method | Brush, dip, or spray |
| Cure | Air dry or bake |
Key Features
- Class H rated (180°C) — suitable for high-temperature motor and transformer applications where lower-rated varnishes fail
- 3,000 V/mil dielectric strength — excellent electrical isolation for windings and coil assemblies
- Arc and corona resistant — extends service life in high-voltage electrical environments
- Moisture and chemical resistance — seals and protects windings from humidity, oils, and contaminants
- Red color for visual inspection — easy confirmation of complete coverage during application
- 2 oz bottle — ideal for small-volume use — perfect for lab work, prototypes, spot repairs, and low-volume maintenance
Industries & Applications
- Electric motor rewind and repair — Class H varnish for stator and rotor winding insulation
- Transformer manufacturing and maintenance — coil impregnation and insulation
- Industrial electrical maintenance — field repairs on motors, generators, and coil assemblies
- R&D and prototype work — small-batch insulation testing and coating evaluation
- Electronics manufacturing — conformal protection of coils, chokes, and inductors
Available Sizes
| Part Number | Size | Case Qty |
|---|---|---|
| 4228A-55ML | 2 oz (55 mL) Bottle | Case of 5 |
| 4228A-225ML | 8 oz (225 mL) Can | Case of 5 |
| 4228A-1L | 2 pt (1 L) Can | Case of 2 |
| 4228A-4L | 1 Gallon (4 L) Can | Case of 1 |
Documentation
Frequently Asked Questions
What is the difference between MG Chemicals 4228A and a conformal coating?
Conformal coatings are thin protective films applied to assembled PCBs. Insulating varnish like the 4228A is a heavier-bodied dielectric coating designed for impregnating wound components — motor windings, transformer coils, and inductors — where mechanical reinforcement and high dielectric strength are required.
What does Class H temperature rating mean?
Class H insulation is rated for continuous operation at 180°C (356°F). It is the appropriate choice when operating temperatures exceed Class F (155°C) limits. Using a lower-rated varnish in a Class H application will result in premature insulation breakdown.
Why would I choose the 2 oz bottle over a larger size?
The 55mL bottle is ideal when you need a small quantity for spot repairs, prototype evaluation, or lab testing. It minimizes waste when only a small area needs coating and avoids opening a larger can that may cure or skin over before use is complete.
Can I brush-apply the 4228A-55ML?
Yes. The small bottle format is well suited for precision brush application on individual components and spot repairs.
Does the red color affect electrical performance?
No. The red pigment is purely for visual identification and has no effect on dielectric strength, arc resistance, or temperature rating.
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