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:
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Switchgear contact boxes (12–40.5 kV)
-
Bushings, insulators, & encapsulation
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Transformers, sensors, & circuit breakers
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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.
Product Tags:
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Epoxy Resin For Indoor High-voltage Switchgear Bushings Transformers Images
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