The LE-8216F/LH-8216F is an epoxy resin system engineered for medium/high-voltage electrical insulation (10-66kV). Featuring a modified weather-resistant anhydride
hardener (LH-8216F) and low-shrinkage formulation, it delivers
exceptional dimensional stability, superior arc resistance, and HB
flammability rating. Ideal for vacuum-cast dry-type transformers,
CTs/VTs, and critical insulation components.
Key Features & Advantages
| Feature | Advantage |
|---|
| Cyclic Aliphatic Epoxy Resin | Superior weather resistance + UV stability |
| Low Curing Shrinkage (0.9-1.1%) | Precision dimensions for complex HV parts |
| Thermal Class B (IEC 60085) | Reliable performance up to 130°C |
| Vacuum Casting Optimized | Seamless integration with existing production |
| High Dielectric Strength | >25 kV/mm (1mm, IEC 60243-1) |
| Low Water Absorption | 0.08-0.15% (100°C/60min) for humid environments |
| Solvent-Free + Low VOC | Eco-friendly processing |
Applications
Built for high-voltage electrical insulation:
Dry-type transformers
Current/voltage transformers (10-66kV)
Bushings, insulators, switchgear
Encapsulation of sensors & relays
Grid infrastructure components
Key Performance Data
*Cured system: LE-8216F/LH-8216F/Silica powder = 100:100:350*
Mechanical & Thermal Properties
| Property | Value | Standard |
|---|
| Glass Transition (Tg) | 60-75°C | ISO 11357-2 |
| Flexural Strength | 100-140 MPa | ISO 178 |
| Impact Strength | 9-16 kJ/m² | ISO 179 |
| Tensile Strength | 65-85 MPa | ISO 527 |
| Compressive Strength | 140-180 MPa | GB/T2567 |
| Thermal Conductivity | 0.8-0.9 W/m·K | ISO 8894-1 |
| Decomposition Temp | >320°C | ASTM E2402 |
Electrical & Safety Properties
| Volume Resistivity | 10¹⁵ Ω·cm | IEC 62631-3-1 |
| Arc Resistance | 181-198 sec | IEC 61621 |
| Tracking Resistance | ≥600 V | IEC 60112 |
| Dielectric Constant | 3.0-4.0 (50Hz) | IEC 60250 |
| Flammability | HB (UL94) | UL94/GB/T2408 |
| Hydrophobicity | HC1 Class | IEC 62073 |
Frequently Asked Questions (FAQ)
Q1: What makes LE-8216F suitable for outdoor HV applications?
A: Its cyclic aliphatic structure provides inherent UV/weather
resistance, while low water absorption (0.08-0.15%) ensures
stability in humid conditions.
Q2: What is the curing process?
A: Optimized for vacuum casting:
Pre-mix: 60-70°C/1-2h (100-300Pa)
Cure: 70-80°C/3-5h → 90-100°C/2-4h → Post-cure 130°C/12h
Q3: How does filler ratio affect properties?
A: Silica powder (300-360 pbw) enhances mechanical strength but
must be uniformly dispersed. Adjust within range to balance
viscosity vs. performance.
Q4: Is this system compatible with APG?
A: Designed for vacuum casting. For APG, consult Shanghai Wenyou
for formulation adjustments.
Q5: What safety measures are critical?
A: Essential PPE: gloves, goggles, respirator. Maintain ventilation
(3-5 air renewals/hour). Avoid skin contact—use barrier cream.
