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| Categories | Transformer Epoxy Resin |
|---|---|
| Brand Name: | WENYOU |
| Model Number: | LW-8229A/LW-8229B |
| Certification: | ISO/REACH/RoHS/SGS/UL |
| Place of Origin: | CHINA |
| MOQ: | 20kg/pail as sample |
| Price: | Negotiable |
| Payment Terms: | L/C,T/T,Western Union,MoneyGram |
| Supply Ability: | Plenty of raw material in stock |
| Delivery Time: | 7 -10 work days |
| Packaging Details: | 20kg/pail, 220kg/barrel, 1200kg/tank |
| Breakdown Strength: | ≥25 kV/mm |
| Tracking Resistance: | ≥600 V |
| Dielectric Constant: | 3.0-4.0 (50Hz) |
| Flammability: | V1 (UL94) |
| Company Info. |
| Shanghai Wenyou Industry Co., Ltd. |
| Verified Supplier |
| View Contact Details |
| Product List |
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.
| 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 |
Ideal for sealed electrical insulation:
10-35kV terminal posts & bushings
Dry-type transformers & current transformers
Switchgear insulation components
HV sensor encapsulation
Grid protection devices
*Cured system: LW-8229A/LW-8229B = 100:100 | Cure: 140°C×4h + 150°C×12h*
| 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 |
| 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 |
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.
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