High Tg Flame Retardant Epoxy Encapsulant for Transformer Insulation & Protection
LE-9265/LH-9265: High Tg UL 94 V-0 Epoxy for HV Insulators & Bushings | APG/Vacuum Casting
Product Overview
LE-9265/LH-9265 is a modified cycloaliphatic epoxy resin system engineered for high-voltage insulators, bushings, and contact boxes (12–40.5 kV). Combining UL 94 V-0 flame resistance, extreme weather durability, and high thermal stability (Tg >150°C), this unfilled liquid resin delivers void-free insulation for outdoor power infrastructure. Compatible with Automatic Pressure Gelation (APG) and vacuum casting, it ensures superior dielectric strength (>18 kV/mm) and CTI >600 V for decades of reliable service.
Key Features & Benefits
| Property | Advantage |
|---|---|
| Weather Resistance | Withstands UV, humidity, and pollution – ideal for outdoor bushings. |
| Flame Safety | UL 94 V-0 certified – prevents fire propagation in electrical faults. |
| Thermal Performance | High Tg (>150°C) + thermal shock resistance – stable under load cycles. |
| Electrical Integrity | CTI >600 V, high dielectric strength – resists tracking/arcing. |
| Processing Flexibility | APG or vacuum casting – integrates with existing production lines. |
| Long-Term Reliability | Resists cracking, hydrolysis, and chemical corrosion. |
Applications
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12–40.5 kV switchgear: Contact boxes, cable terminations
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Outdoor bushings & insulators
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Transformer bushings and surge arresters
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Railway/utility power distribution insulation
Technical Specifications
| Component | Part | Ratio (pbw) | Form |
|---|---|---|---|
| Epoxy Resin | LE-9265 | 100 | Liquid (unfilled) |
| Anhydride Hardener | LH-9265 | 100 | Liquid |
| Silica Filler | WY-12X | 250–270 | Optional |
| Color Paste | LC Series | 3 | Optional |
Cured Properties:
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Glass Transition Temp (Tg): >150°C
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Dielectric Strength: >18 kV/mm
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Comparative Tracking Index (CTI): >600 V
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UL 94 Rating: V-0
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Thermal Shock Resistance: >1,000 cycles (-40°C to +125°C)
Processing Methods
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Automatic Pressure Gelation (APG):
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Fast, low-waste production for high-volume insulator molding.
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Vacuum Gravity Casting:
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Bubble-free encapsulation for complex bushing geometries.
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Why Choose This System?
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Weatherproof: Cycloaliphatic base resists yellowing/erosion in harsh environments.
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Safety Compliance: Meets UL 94 V-0, IEC 60137, and ASTM D2303 standards.
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Customizable: Adjust filler ratios (WY-12X) for viscosity/mechanical needs.
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Zero Voids: Ensures partial discharge-free insulation for HV applications
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Example application image
Get in Touch
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