MG Chemicals 4228A-225ML Red Insulating Varnish Dielectric Coating, 8 oz. Can, Case of 5
MG Chemicals 4228A Red Insulating Varnish — 8 oz Can, 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 8 oz (225mL) can, sold in a case of 5.
Specifications
| Part Number | 4228A-225ML |
|---|---|
| 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 | 8 oz (225 mL) Can |
| Case Quantity | 5 cans 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
- Multiple application methods — suitable for brushing, dipping, or spraying depending on component geometry
- 8 oz can — ideal for bench use — convenient size for repair shops, maintenance teams, and low-volume production
Industries & Applications
- Electric motor rewind and repair — Class H varnish for stator and rotor winding insulation and moisture sealing
- Transformer manufacturing and maintenance — coil impregnation and insulation for distribution and power transformers
- Industrial electrical maintenance — field repairs on motors, generators, and coil assemblies
- HVAC and pump motor service — rewinding and insulation of motors in high-humidity or wash-down environments
- Aerospace and defense electronics — dielectric protection in high-temperature or high-vibration assemblies
- Electronics manufacturing — conformal protection of coils, chokes, and inductors on PCB assemblies
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 (like acrylic or urethane) are thin protective films applied to assembled PCBs to resist moisture and contamination. Insulating varnish like the 4228A is a heavier-bodied dielectric coating designed specifically for impregnating and insulating wound components — motor windings, transformer coils, and inductors — where mechanical reinforcement and high dielectric strength are required in addition to moisture protection.
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 breakdown of the insulation and potential motor or transformer failure.
Can I brush-apply the 4228A-225ML?
Yes. The 8 oz can size is well suited for brush application on individual components, field repairs, and bench motor rewind work. For production dip-tank or spray applications, the 1L or gallon sizes offer better economy.
Does the red color affect electrical performance?
No. The red pigment in 4228A is purely for visual identification and inspection — it has no effect on dielectric strength, arc resistance, or temperature rating. It allows technicians to verify full winding coverage before cure.
Is a TDS available for the 4228A?
Yes — see the MG Chemicals 4228A Technical Data Sheet for full cure schedules, application instructions, and electrical properties.
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