JT 8869A/B Epoxy Resin Casting Compound for Dry Type Transformers - 22-25 KV/mm Breakdown Strength, 68-78 MPa Tensile
JT 8869A/B is a prefilled, solvent-free epoxy resin casting compound system specifically designed for electrical insulation in dry type transformers and instrument transformers. This hot-curing cast resin system offers excellent performance for medium and high voltage outdoor applications.
| Property | Test Method | Typical Values |
|---|---|---|
| Viscosity @ 25℃ | ISO 2555:1989 | 9-16 mPa.s |
| Density @ 20℃ | g-Kugel | 1.55-1.22 g/cm³ |
| Filler Content | Pbw | 47-52% |
| Property | Test Method | Typical Values |
|---|---|---|
| Viscosity @ 25℃ | ISO 2555:1989 | 15-25 mPa.s |
| Density @ 20℃ | ISO 2811-2:1997 | 1.79-1.86 g/cm³ |
| Filler Content | Pbw | 60-65% |
- Conventional casting with stage-wise curing
- Pressure gelation casting (PG process)
- Automatic pressure gelation casting (APG process)
- Long pot life for extended working time
- Excellent mechanical performance and crack resistance
- High breakdown strength: 22-25 KV/mm
- Glass transition temperature: 65-75℃
- Tensile strength: 68-78 MPa
- Flexural strength: 110-125 MPa
- Low water absorption: 0.15-0.20%
Storage Conditions: Store at 5-25°C in tightly sealed original containers under dry conditions. Shelf life corresponds to expiry date on label.
Important Notes: JT 8869B contains accelerator and is sensitive to moisture. Reseal containers immediately after partial use. Prolonged storage at high temperatures increases viscosity and impairs reactivity.
Personal Protective Equipment Required:
- Protective gloves and clothing
- Safety goggles or glasses
- Recommended: dust mask, arm protection
Refer to Material Safety Data Sheets (MSDS) for detailed safety information, waste disposal procedures, and hazardous decomposition products.
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