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High-performance unsaturated polyester resin designed for vacuum pressure impregnation (VPI) systems.
Excellent electrical insulation properties and thermal stability up to Class H (180 °C).
Low viscosity and controlled reactivity for deep, uniform penetration into complex stator and rotor windings.
Good compatibility with common accelerators and curing agents, enabling flexible process optimization.
Low volatile organic compound (VOC) content, supporting environmentally responsible manufacturing practices.
Electrical insulation of medium- and high-voltage electric motor windings.
Vacuum pressure impregnation (VPI) of generators and alternators in power generation equipment.
Insulation systems for traction motors used in rail and industrial electric vehicles.
Encapsulation and impregnation of transformers and reactors requiring robust dielectric integrity.
| Chemical Type | Unsaturated Polyester Resin |
| Product Form | Liquid |
| Appearance | Clear to pale yellow, homogeneous liquid |
| Viscosity (25 °C, mPa·s) | 250–450 |
| Reactive Diluent Content | Styrene, ~35–40 wt% |
| Density (20 °C, g/cm³) | 1.08–1.12 |
| Flash Point (PMCC, °C) | 35–40 |
| Primary Applications | Vacuum Pressure Impregnation (VPI) for rotating electrical machines |
Q1: What is the primary application of DUROFTAL VPI 2803 78BAC?
A: DUROFTAL VPI 2803 78BAC is a vinyl ester-modified unsaturated polyester resin specifically engineered for vacuum pressure impregnation (VPI) systems in electrical insulation applications, particularly for high-voltage stator windings and rotating machine coils.
Q2: How does this resin perform under thermal cycling and humidity exposure?
A: Thanks to its vinyl ester modification and optimized molecular structure, DUROFTAL VPI 2803 78BAC delivers enhanced hydrolytic stability and improved resistance to thermal-mechanical stress, supporting reliable long-term performance in demanding service environments typical of industrial motors and generators.
Q3: Is DUROFTAL VPI 2803 78BAC compatible with standard VPI process equipment and common curing agents?
A: Yes — it is formulated for compatibility with conventional VPI equipment and works effectively with industry-standard peroxide initiators (e.g., MEKP or CHP-based systems), enabling straightforward integration into existing manufacturing workflows without major process modifications.
Q4: What are the key handling and storage recommendations?
A: Store in original unopened containers at temperatures between 15–25 °C, away from direct sunlight and strong oxidizers. Avoid prolonged exposure to elevated temperatures or moisture prior to use, as these may affect shelf life and gel time consistency.
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E-mail: wangxingqiang@ericwchem.com
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