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
| Feature | Advantage |
|---|
| Modified BPA Epoxy + Anhydride Hardener | High mechanical strength + thermal stability |
| Adjustable Silica Filler (300-400 pbw) | Customizable viscosity/performance balance |
| Thermal Class H (IEC 60085) | Reliable operation up to 180°C |
| Dual-Process Compatibility | Seamless APG or vacuum casting integration |
| Low Curing Shrinkage (0.8-1.0%) | Precision dimensional stability |
| HB Flammability Rating (UL94) | Enhanced fire safety for electrical components |
| High Arc Resistance | 181-198 sec (IEC 61621) |
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
| Property | Value | Standard |
|---|
| Glass Transition (Tg) | 105-120°C | ISO 11357-2 |
| Flexural Strength | 100-130 MPa | ISO 178 |
| Compressive Strength | 150-200 MPa | GB/T2567 |
| Impact Strength | 9-14 kJ/m² | ISO 179 |
| Thermal Conductivity | 0.4-0.8 W/m·K | ISO 8894-1 |
| Water Absorption | <0.2% (100°C/60min) | ISO 62 |
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.
