The LE-184/LH-8504 epoxy system is a weather-resistant,
multi-component formulation engineered for outdoor high-voltage
electrical insulation. Featuring modified BPA epoxy (LE-184),
anhydride hardener (LH-8504), flexibilizer (LF-660), and
accelerator (LZ-622), it delivers exceptional UV/erosion
resistance, thermal shock stability, and superior dielectric
performance. Ideal for APG or vacuum casting processes in harsh
environments.
Key Features & Advantages
| Feature | Advantage |
|---|
| UV & Weather Resistance | Withstands outdoor exposure, prevents erosion & yellowing |
| Flexibilizer LF-660 (0-20 pbw) | Enhances crack resistance under thermal cycling |
| Accelerator LZ-622 (0-0.4 pbw) | Speeds curing for high-volume production |
| APG & Vacuum Casting Compatible | Adapts to existing manufacturing setups |
| High Dielectric Strength | 25-35 kV/mm (IEC 60243-1) for outdoor insulators |
| Low Water Absorption | 0.10-0.20% (23°C/10d) ensures long-term integrity |
| Solvent-Free | Eco-friendly, low-VOC processing |
Applications
Built for outdoor electrical components:
HV bushings, insulators & surge arresters
Transformer encapsulation
Outdoor switchgear (12-40.5 kV)
Solar/Wind energy infrastructure
Railway electrification components
Key Performance Data
*Cured system: LE-184/LH-8504/Silica=100:90:350 | Cure: 140°C×2h +
130°C×10h*
Mechanical & Thermal Properties
| Property | Value | Standard |
|---|
| Tensile Strength | 60-85 MPa | ISO 527 |
| Flexural Strength | 100-140 MPa | ISO 178 |
| Impact Strength | 8-16 kJ/m² | ISO 179 |
| Glass Transition (Tg) | 65-105°C | ISO 11357-2 |
| Thermal Conductivity | 0.7-0.9 W/m·K | ISO 8894-1 |
| Decomposition Temp | >320°C | ASTM E2402 |
Electrical & Safety Properties
| Breakdown Strength (3mm) | 25-30 kV/mm | IEC 60243-1 |
| HV Arc Resistance | 185-195 sec | IEC 61621 |
| Tracking Resistance | CTI>600 (Solution A/B) | IEC 60112 |
| Electrolytic Corrosion | Grade A-1 | IEC 60426 |
| Flammability | HB Rating | UL94 |
Frequently Asked Questions (FAQ)
Q1: What’s the role of LF-660 and LZ-622?
A: LF-660 (0-20 pbw) improves flexibility & crack resistance.
LZ-622 (0-0.4 pbw) accelerates curing – critical for APG
production.
Q2: How should I store components?
A: Store in sealed containers at 18-25°C. Shelf life: 24 months.
Avoid moisture – hardener is humidity-sensitive.
Q3: What processing methods are supported?
A: Optimized for:
APG: Mold temp 130-150°C | Gel time 10-50 min
Vacuum Casting: Cure 80-100°C | Gel time 3-6h
Post-cure: 130-140°C×6-10h for all methods
Q4: How is filler pre-treated for HV applications?
A: Silica filler must be pre-dried (moisture ≤0.2%). Use thin-film
degassing mixers for consistent dispersion.
Q5: Is this system suitable for coastal environments?
A: Yes! UV resistance + low water absorption (0.10-0.20%) prevents
salt corrosion & tracking.
