Low Viscosity Flame Retardant Epoxy for Void-Free Transformer Coil Impregnation
Brand Name:wenyou
Certification:ISO9001, ISO14001, SGS, and UL
Model Number:9204
Minimum Order Quantity:20kg/pail as sample
Delivery Time:7 -10 work days
Payment Terms:Normally L/C,T/T
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Product Details
LE-9204/LH-9204: UL 94 V-0 Low-Viscosity Epoxy for Transformer Coil Impregnation & Bushings
Product Overview
LE-9204/LH-9204 is a low-viscosity, flame-retardant epoxy system engineered for void-free impregnation of transformer coils and high-voltage bushings. Featuring UL 94 V-0 certification and exceptional flow characteristics, it penetrates complex winding structures to eliminate air pockets, prevent partial discharge, and enhance dielectric strength. Ideal for VPI processes, APG molding, or vacuum casting of dry-type transformers, switchgear, and indoor insulation components up to 40.5 kV.
Key Features & Benefits
| Property | Advantage |
|---|---|
| Ultra-Low Viscosity | Deep penetration into coil windings for void-free insulation |
| Flame Safety | UL 94 V-0 certified – critical for dry-type transformers & indoor switchgear |
| Thermal Resilience | Withstands >1,000 thermal shock cycles (-40°C to +150°C) |
| Electrical Integrity | High CTI (>600 V) and dielectric strength (>18 kV/mm) |
| Process Flexibility | Compatible with VPI, APG, and vacuum gravity casting |
| Custom Formulation | Adjust LF-630 flexibilizer (0-20 pbw) for stress reduction |
Applications
Dry-type transformers: Coil impregnation and encapsulation
Medium-voltage switchgear (up to 40.5 kV)
Bushings and insulators for indoor applications
Sensor coils and reactor windings
PCB insulation barriers
Technical Formulation
| Component | Part | Ratio (pbw) | Function |
|---|---|---|---|
| Epoxy Resin | LE-9204 | 100 | BPA-based liquid resin |
| Anhydride Hardener | LH-9204 | 85 | Carboxylic acid curing |
| Flexibilizer | LF-630 | 0–20 (opt.) | Reduces brittleness |
| Accelerator | LZ-622 | 0.2–1.5 | Controls cure speed |
| Silica Filler | Powder | 320–390 | Enhances mechanicals |
| Color Paste | LC Series | 3 (opt.) | Visual identification |
Cured Properties:
Viscosity (mixed): <500 mPa·s (enables deep impregnation)
UL 94 Rating: V-0
Comparative Tracking Index: >600 V
Dielectric Strength: >18 kV/mm
Thermal Shock Resistance: Passes IEC 60137 cycling tests
Processing Methods
Vacuum Pressure Impregnation (VPI):
Optimal for transformer coils – ensures void-free penetration
Automatic Pressure Gelation (APG):
High-volume production of bushings/insulators
Vacuum Gravity Casting:
Bubble-free encapsulation for complex geometries
Why Choose This System?
Void Elimination: Ultra-low viscosity removes air pockets in windings
Fire Safety: Critical UL 94 V-0 rating for indoor electrical equipment
Flexibility Control: Tune toughness with LF-630 flexibilizer
Accelerated Curing: LZ-622 enables rapid production cycles
Industrial Compliance: Meets IEEE C57.12.01 for dry-type transformers
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Low Viscosity Flame Retardant Epoxy for Void-Free Transformer Coil Impregnation
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