The LE-9219K/LH-9219K is a high-performance two-component epoxy resin system designed
for medium/high-voltage electrical insulation (12–40.5 kV). Formulated with modified BPA epoxy resin (LE-9219K)
and carboxylic anhydride hardener (LH-9219K), it delivers
exceptional thermal shock resistance, superior crack resistance,
and H-class thermal stability (IEC 60085). Ideal for vacuum casting
or APG processes, it ensures reliability in critical indoor
electrical components.
Key Features & Advantages
| Feature | Advantage |
|---|
| Modified BPA Epoxy + Anhydride Hardener | Enhanced thermal stability & mechanical strength |
| Optimized for Vacuum Casting/APG | Flexible processing, adaptable to client production methods |
| Superior Crack Resistance | Withstands thermal cycling, reducing failure risks |
| HB Flammability Rating (UL94) | Meets strict safety standards for electrical applications |
| High Dielectric Strength | ≥25 kV/mm (1mm thickness, IEC 60243-1) |
| Low Water Absorption | 0.10–0.20% (23°C/10 days) for long-term insulation integrity |
| H-Class Thermal Endurance | Sustained performance up to 150°C |
Applications
Perfect for insulating components in indoor high-voltage systems:
Switchgear contact boxes (12–40.5 kV)
Bushings, insulators, & encapsulation
Transformers, sensors, & circuit breakers
HV insulation products requiring precision casting
Key Performance Data
*Cured system: LE-9219K/LH-9219K/Silica powder = 100:100:350 @
140°C/10h*
| Property | Value | Standard |
|---|
| Glass Transition Temp (Tg) | 105–120°C | ISO 11357-2 |
| Tensile Strength | 65–85 MPa | ISO 527 |
| Flexural Strength | 105–140 MPa | ISO 178 |
| Volume Resistivity | 10¹⁵ Ω·cm | IEC 62631-3-1 |
| Arc Resistance | 181–198 sec | IEC 61621 |
| Breakdown Strength | ≥25 kV/mm | IEC 60243-1 |
| Dielectric Constant | 3.0–4.0 (50Hz) | IEC 60250 |
| Water Absorption | 0.10–0.20% (23°C/10d) | ISO 62 |
| Tracking Resistance | ≥600 V | IEC 60112 |
| Curing Shrinkage | 0.8–1.0% | HG/T2625 |
Frequently Asked Questions (FAQ)
Q1: What is the mix ratio for LE-9219K/LH-9219K?
A: Standard ratio is 100:100 pbw (resin:hardener). Filler (silica
powder) added at 300–380 pbw.
Q2: How should the hardener be stored?
A: Store in sealed containers at 6–35°C. Avoid moisture exposure.
If crystallized, preheat to 70–80°C and stir before use.
Q3: What curing process is recommended?
A: Two options:
Vacuum Casting: Cure 70–80°C/3–5h + 90–100°C/2–4h; Post-cure
130°C/12h.
APG: Mold temp 130–160°C; Post-cure 130–150°C/10–12h.
Q4: Is this system suitable for outdoor use?
A: Designed for indoor electrical insulation only. Hydrophobicity
class HC1 (IEC TS 62073).
Q5: What safety measures are required during handling?
A: Mandatory: gloves, goggles, protective clothing. Use ventilation
(3–5 air renewals/hour). Avoid skin contact—wash immediately if
exposed.
