LE-8516L/LH-8516L: Ultra-Low Viscosity Epoxy System for Void-Free
MV Transformer Potting
Cycloaliphatic Resin + Anhydride Hardener for Precision CT/PT
Encapsulation
Product Overview
LE-8516L epoxy resin and LH-8516L hardener deliver ultra-low
viscosity (<500cPs mixed) for flawless void-free
encapsulation of MV current/voltage transformers. Engineered to
penetrate micron-scale gaps in densely wound coils, this system
ensures partial discharge <5pC and compliance
with IEEE C57.13 accuracy standards.
Critical Performance Advantages
| Property | Performance |
|---|
| Void Elimination | <0.1% microvoids • Prevents electrical treeing |
| Electrical Integrity | Volume resistivity >1E15 Ω·cm • DF <0.01 @50Hz |
| Thermal Management | Conductivity >0.5 W/mK • Tg >110°C |
| Process Efficiency | 5X deeper penetration vs standard epoxies |
Applications
Instrument Transformers: CTs/PTs (15-36kV)
MV Switchgear Components
High-Voltage Insulators & Bushings
Precision Electronics Encapsulation
Optimized Processing
| Method | Key Benefit |
|---|
| Vacuum Gravity Casting | Bubble-free impregnation of cellulose barriers |
| Automated Potting Systems | Consistent results for high-volume production |
| Compatible with existing manufacturing setups |
Recommended Formulation
| Component | Material | Ratio (pbw) |
|---|
| Epoxy Resin | LE-8516L (Cycloaliphatic) | 100 |
| Hardener | LH-8516L (Anhydride) | 100 |
| Filler | Silica Powder | 250-350 |
| Accelerator | LZ-622 | 2-4 |
| Colorant | LC Series Paste | As needed |
Certified Performance Data
| Parameter | Value | Standard |
|---|
| Mixed Viscosity | 450-480 cPs | ASTM D2196 |
| Partial Discharge | <3 pC @ 1.5Ur | IEC 60270 |
| Flexural Strength | 105 MPa | ISO 178 |
| Thermal Shock | Passes 500 cycles (-40°C↔125°C) | IEC 60068-2-14 |
Why This System?
Precision Reliability: Maintains 0.2% metering accuracy in CTs/PTs
Short-Circuit Resilience: Withstands 50kA/3s mechanical stress
UV/Environment Proof: Cycloaliphatic chemistry resists yellowing
Faster Processing: Accelerator reduces gel time by 35%
The Gold Standard for HV Instrument Transformers – Trusted by
global manufacturers for mission-critical grid components where
dielectric perfection and long-term stability are non-negotiable.
