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

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

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.