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.

Shanghai Wenyou Industry Co., Ltd.mainly engaged in the advanced materialsof MV and HV insulation products for indoorand outdoor use, both suitable for APG andvacuum casting.

Our wide range of products includes epoxy resin, flame retardant resin, curing agents, outdoor modifiers, toughening agents, epoxy paste, demoulding agents, and fillers.

We have obtained ISO9001, ISO14001, SGS, and UL certifications, and our products comply with ROHS and REACH safety regulations.

Our high-quality products are used in high voltage electrical insulation applications and are exported globally. We are committed to providing stable products and excellent service to the global electricity industry.

High Quality Electrical Raw Materials
Epoxy resin

Release agent

Silica powder
Hardener
Color paste
Flexibilizer