For high-impact encapsulation of instrument transformers, lighting transformers, small power transformers, and coils, Megapoxy E provides high-dielectric casting insulation for electrical components operating under demanding physical and thermal stress.
Megapoxy E is a high-impact pouring epoxy formulated for casting electrical switchgear components and mechanical applications requiring chemical resistance. When cured, the system delivers high static and dynamic mechanical properties, maintaining bond strength and electrical insulation under cyclic operational loads. The system is configured using Part A resin paired with one of two hardeners depending on the continuous service temperature of the encapsulated electrical components.
Achieving rated adhesion requires thorough pre-treatment of all casting surfaces. Clean all surfaces using acetone or isopropyl alcohol prior to pouring. Mix Part A with your chosen hardener according to the specified ratios:
The minimum curing time for both configurations is 24 hours at 25ºC. To keep mixing implements and working tools clean, use Megapoxy Thinners. Wear disposable rubber gloves during mixing and application to protect hands.
Megapoxy E's maximum service temperature depends on the hardener used. With Hardener E, it is rated for service up to 80°C. When paired with Hardener 155, it can withstand service temperatures up to 150°C, offering higher thermal performance.
Yes, proper surface preparation is critical for strong adhesion and preventing electrical failure. All surfaces must be cleaned with acetone or isopropyl alcohol to remove impurities. Wire brushing is specifically noted as inadequate.
Megapoxy E is specifically formulated for electrical and electronic industries, providing superior electrical and dielectric properties along with high mechanical strength. Its primary applications are encapsulation of transformers, coils, and casting switchgear components, not general-purpose bonding.
Both hardener variants, Hardener E and Hardener 155, require a minimum curing time of 24 hours at 25°C before components can be put into service. The working time at 25°C varies from 30 to 60 minutes depending on the hardener.
| Application | Key benefit | Primary trades |
|---|---|---|
| Encapsulation of instrument transformers | Delivers 18-19 KV/mm dielectric strength and high impact resistance, protecting sensitive components. | Electrical component manufacturers, industrial electricians |
| Potting of lighting transformers and coils | Provides superior electrical insulation and mechanical support against vibration and impacts. | Electronics manufacturers, lighting component producers |
| Casting electrical switchgear components | Achieves up to 100 MPa compressive strength and 20 MPa bond strength for robust, long-term performance. | Switchgear manufacturers, electrical contractors |
| High-temperature electrical assemblies | Ensures reliable operation in elevated temperatures, up to 150°C when cured with Hardener 155. | Industrial electrical engineers, thermal design specialists |
Warning: Megapoxy E Part A is a skin and eye irritant and may cause allergic skin reactions. It is toxic to aquatic life with long lasting effects.
Danger: Megapoxy E Part B (both Hardener E and Hardener 155) causes skin irritation and serious eye damage. Part B with Hardener 155 is also harmful if swallowed or in contact with skin, and causes severe skin burns.
Wear safety shoes, protective clothing, gloves (nitrile rubber recommended), safety glasses or eye/face protection, and a suitable respirator to avoid breathing vapours, mists, or aerosols.
Natural ventilation is adequate under normal use conditions. Ensure eyewash stations and safety showers are accessible near the workstation.
Store in a cool, dry, well-ventilated place, out of direct sunlight, away from foodstuffs, incompatible materials, and ignition sources. Keep containers upright and closed. Part B hardeners must be stored locked up. Dispose of contents and container according to local, regional, national, and international regulations.
Achieving specified mechanical and electrical performance relies on correct surface preparation before encapsulation or casting.
Surface prep: Remove all surface impurities, oils, and residues. Clean thoroughly with acetone or isopropyl alcohol. Wire brushing alone is not sufficient and will lead to poor adhesion.
Primer: Not required. Focus on solvent cleaning for optimal bond.
| Property | Value |
|---|---|
| Mixing Ratio by Weight Resin (Hardener E) | 5 |
| Mixing Ratio by Weight Hardener (Hardener E) | 1 |
| Mixing Ratio by Volume Resin (Hardener E) | 3 |
| Mixing Ratio by Volume Hardener (Hardener E) | 1 |
| Density Mixed (Hardener E) | 1.55 g/cm3 |
| Working Time at 25°C (Hardener E) | 60 Minutes |
| Minimum Curing Time at 25°C (Hardener E) | 24 Hours |
| Viscosity Part A | 10000 - 15000 cps |
| Viscosity Part B (Hardener E) | 500 - 900 cps |
| Mixed Viscosity (Hardener E) | 3000 cps |
| Specific Gravity Part A | 1.65 - 1.75 |
| Specific Gravity Part B (Hardener E) | 0.95 - 0.97 |
| Mixed Specific Gravity (Hardener E) | 1.55 |
| Ultimate Compressive Strength (Hardener E) | 80 MPa |
| Martins Heat Distortion Temperature (Hardener E) | 65°C |
| Typical Dielectric Strength 50Hz, 25°C (Hardener E) | 18 KV/mm |
| Bond Strength | 20 MPa |
| Hardness Shore D (ASTM D2240-00) | 75 |
| Mixing Ratio by Weight Resin (Hardener 155) | 10 |
| Mixing Ratio by Weight Hardener (Hardener 155) | 1 |
| Mixing Ratio by Volume Resin (Hardener 155) | 6 |
| Mixing Ratio by Volume Hardener (Hardener 155) | 1 |
| Density Mixed (Hardener 155) | 1.6 g/cm3 |
| Working Time at 25°C (Hardener 155) | 30 Minutes |
| Minimum Curing Time at 25°C (Hardener 155) | 24 Hours |
| Viscosity Part B (Hardener 155) | 18 - 24 cps |
| Mixed Viscosity (Hardener 155) | 6500 cps |
| Specific Gravity Part B (Hardener 155) | 0.90 - 0.95 |
| Mixed Specific Gravity (Hardener 155) | 1.60 |
| Ultimate Compressive Strength (Hardener 155) | 100 MPa |
| Martins Heat Distortion Temperature (Hardener 155) | 127°C |
| Typical Dielectric Strength 50Hz, 25°C (Hardener 155) | 19 KV/mm |
| Total VOC (g/Litre) | Nil |
Here are some common examples on where Megapoxy E used by our customers.
