MG Chemicals 4228A-225ML Red Insulating Varnish Dielectric Coating, 8 oz. Can, Case of 5
MG Chemicals 4228A-225ML Red Insulating Varnish Dielectric Coating, 8 oz. Can, Case of 5
MG Chemicals 4228A is a Class H red insulating varnish with a dielectric strength of 3,000 V/mil (dry) that protects transformer windings, motor coils, and electric generator components against arc, corona, corrosion, and moisture. It is a low-viscosity, single-part coating that applies easily and adheres well to most substrates, curing to a tough, flexible, high-gloss red finish rated for continuous service up to 180°C.
Sold in cases of 5 (8 oz. cans).
Specifications
| Brand | MG Chemicals |
| Part Number | 4228A-225ML |
| Product Type | Red Insulating Varnish / Dielectric Coating |
| Insulation Class | Class H — rated for continuous service up to 180°C |
| Dielectric Strength (Dry) | 3,000 V/mil |
| Dielectric Strength (Wet) | 1,500 V/mil |
| Arc & Corona Resistance | Excellent |
| Moisture Resistance | Excellent |
| Oil Resistance | Excellent |
| Water & Saltwater Resistance | Good |
| Adhesion | Good — adheres to most substrates |
| Finish | Tough, flexible, high-gloss red coat |
| Viscosity | Low — easy to apply |
| Components | 1-part (no mixing required) |
| Container Size | 225 mL (7.6 fl oz) can |
| Case Quantity | 5 cans per case |
| Applications | Transformer windings, motor coils, electric generator parts, coil insulation, high-voltage components |
| Manufacturer | MG Chemicals |
Frequently Asked Questions
What is Class H insulation and why does it matter?
Class H is an insulation rating defined by IEC and NEMA standards for materials that can withstand continuous operating temperatures up to 180°C. MG Chemicals 4228A meets Class H requirements, making it suitable for high-temperature motor windings, transformers, and generator components where lower-rated varnishes would degrade.
What is the dielectric strength of MG Chemicals 4228A?
4228A has a dielectric strength of 3,000 V/mil when dry and 1,500 V/mil when wet — providing a strong electrical insulation barrier that resists arc and corona discharge in high-voltage applications.
What surfaces does MG Chemicals 4228A adhere to?
4228A is a low-viscosity, single-part varnish that adheres well to most substrates including copper windings, ferrous metals, and common coil materials used in motors, transformers, and generators.
How is MG Chemicals 4228A applied?
4228A can be applied by dipping, brushing, or spraying. Its low viscosity allows it to penetrate winding interstices effectively. Allow adequate cure time per the Technical Data Sheet before returning components to service.
