Epoxy System H-Class Insulation 12-40.5kV Applications Vacuum / APG Casting

The LE-9215/LH-9215 is a high-performance epoxy system for medium/high-voltage electrical insulation (12-40.5kV). Featuring modified BPA epoxy resin (LE-9215) and anhydride hardener (LH-9215), it delivers exceptional thermal shock resistance, superior dielectric strength, and H-class thermal endurance (180°C). Optimized for vacuum casting and APG processes in contact boxes, insulators, and switchgear.

Key Features & Advantages

Applications

Built for critical HV insulation:

     12-40.5kV contact boxes & insulators

     Switchgear components

     Current/voltage transformers

     Encapsulation of relays & sensors

     Grid infrastructure protection devices

Key Performance Data

*Cured system: LE-9215/LH-9215/Silica powder = 100:100:350*

Mechanical & Thermal Properties

Electrical & Safety Properties

| Breakdown Strength | ≥25 kV/mm | IEC 60243-1 |
| Volume Resistivity | 10¹⁵ Ω·cm | IEC 62631-3-1 |
| Tracking Resistance | ≥600 V | IEC 60112 |
| Dielectric Loss | <0.02% | IEC 60250 |
| Flammability | HB (UL94) | UL94/GB/T2408 |
| Hydrophobicity | HC1 Class | IEC 62073 |

Frequently Asked Questions (FAQ)

Q1: What’s the optimal silica filler ratio?
A: Adjust between 300-400 pbw – higher ratios enhance strength but increase viscosity.

Q2: How does this system handle thermal cycling?
A: Excellent thermal shock resistance due to low shrinkage (0.8-1.0%) and high Tg (105-120°C).

Q3: What curing process is recommended?
A:Vacuum Casting: Cure @70-80°C/3-5h → 90-100°C/2-4h → Post-cure 130°C/12h

    APG: Post-cure @130-150°C/10-12h after molding.

Q4: Is color customization possible?
A: Yes! LC series color pastes can be added (3 pbw recommended).

Q5: Why choose HB flammability rating?
A: HB classification balances safety and cost for 12-40.5kV indoor applications.