The LW-8229A/LW-8229B is a pre-mixed, filler-loaded epoxy system designed for medium/high-voltage insulation (10-35kV). Combining modified BPA epoxy (LW-8229A) and anhydride hardener (LW-8229B) with integrated fillers, it delivers superior crack resistance, V1 flammability rating (UL94), and H-class thermal endurance (180°C). Optimized for vacuum casting and APG processes in transformers, CTs, and terminal posts.
Key Features & Advantages
| Feature |
Advantage |
| Pre-Mixed Fillers |
Simplified processing, consistent dispersion |
| V1 Flammability Rating |
Enhanced fire safety for critical electrical components |
| Thermal Class H (IEC 60085) |
Stable performance up to 180°C |
| APG & Vacuum Casting Ready |
Flexible production integration |
| High Arc Resistance |
181-198 sec (IEC 61621) |
| Low Water Absorption |
0.10-0.20% (23°C/10d) |
| Dual-Process Compatibility |
Adapts to APG or vacuum workflows |
Applications
Ideal for sealed electrical insulation:
10-35kV terminal posts & bushings
Dry-type transformers & current transformers
Switchgear insulation components
HV sensor encapsulation
Grid protection devices
Key Performance Data
*Cured system: LW-8229A/LW-8229B = 100:100 | Cure: 140°C×4h + 150°C×12h*
Mechanical & Thermal Properties
| Property |
Value |
Standard |
| Flexural Strength |
90-130 MPa |
ISO 178 |
| Tensile Strength |
55-85 MPa |
ISO 527 |
| Impact Strength |
8-15 kJ/m² |
ISO 179 |
| Glass Transition (Tg) |
105-120°C |
ISO 11357-2 |
| Thermal Conductivity |
0.8-0.9 W/m·K |
ISO 8894-1 |
| Decomposition Temp |
>320°C |
ASTM E2402 |
Electrical & Safety Properties
| Breakdown Strength | ≥25 kV/mm | IEC 60243-1 |
| Volume Resistivity | 10¹⁵ Ω·cm | IEC 62631-3-1 |
| Tracking Resistance | ≥600 V | IEC 60112 |
| Dielectric Constant | 3.0-4.0 (50Hz) | IEC 60250 |
| Flammability | V1 (UL94) | UL94/GB/T2408 |
| Hydrophobicity | HC1 Class | IEC 62073 |
Frequently Asked Questions (FAQ)
Q1: Are fillers pre-mixed in this system?
A: Yes! Both LW-8229A (resin) and LW-8229B (hardener) contain pre-dispersed fillers, ensuring uniform properties and reduced mixing complexity.
Q2: What curing cycle is recommended?
A: For vacuum casting:
Cure: 75°C/4-5h → 95°C/2h → 115°C/4-6h → Post-cure 150°C/12h
For APG: Post-cure 130-150°C/10-12h after molding.
Q3: Why choose V1 flammability over HB?
A: V1 rating offers superior fire resistance for high-risk applications like transformers and terminal posts, meeting stricter safety standards.
Q4: Is silica filler adjustable?
A: Fillers are pre-loaded. For custom ratios, contact Shanghai Wenyou for tailored solutions.
Product Tags:
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Pre-Filled Epoxy System V1 Flammability HV Insulation 10-35kV APG / Vacuum Casting Images
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