Advanced Insulation Solution: EPGM203 for Motors, Transformers and New Energy Equipment

EPGM203 is manufactured by hot-pressing alkali-free glass fiber mat impregnated with high-Tg epoxy resin, featuring a randomly oriented chopped fiber structure that delivers exceptional electrical reliability and mechanical stability. As a Class F epoxy glass mat laminate, EPGM203 stands out for its outstanding heat resistance, superior insulation, and robust mechanical performance, making it the insulation material of choice for high-end electrical equipment including motors, transformers, and switchgears.

1. Outstanding Thermal Resistance

Long-term continuous operating temperature: ≤155°C (Class F), in full compliance with IEC thermal standards to satisfy the demands of continuous high-temperature equipment operation.

Short-term thermal peak resistance: up to 180°C (Class H), ensuring stable performance under transient high-temperature conditions with excellent retention of mechanical strength at elevated temperatures.

Glass transition temperature (Tg): 165°C±5°C, resisting softening and deformation in high-temperature environments to preserve structural integrity.

2. Stable Electrical Performance

Dielectric strength: ≥14kV/mm; breakdown voltage in oil at 90°C: >60kV, with consistent insulation performance even in high-humidity environments to eliminate leakage risks.

Volume resistivity: ≥10⁹ Ω·cm, maintaining low leakage current under harsh humid conditions.

Flammability rating: UL 94 V-0, self-extinguishing upon ignition with no toxic fume emission, meeting stringent safety requirements.

Excellent arc resistance and tracking resistance; Comparative Tracking Index (CTI): 600V, ideal for high-voltage electrical applications.

3. Reliable Mechanical Properties

Tensile strength: ≥250MPa; uniform chopped glass fiber reinforcement provides excellent impact resistance and high resistance to brittle fracture.

Flexural strength: ≥380MPa, retaining stable rigidity at high temperatures to support critical equipment components.

Dimensional stability: low coefficient of thermal expansion, minimal distortion under high-temperature and high-humidity conditions, enabling tight machining tolerances.

Machinability: compatible with CNC milling, drilling, punching, and other precision machining processes for cost-effective fabrication of complex components.

4. Weather and Chemical Stability

Water absorption: ≤0.5% (24-hour immersion), highly resistant to moisture for reliable performance in outdoor or humid environments.

Chemical resistance: compatible with transformer oil, hydraulic oil, alcohols, ketones, and other media, with no swelling or cracking.

With its well-balanced performance, EPGM203 is widely used across four major industries: electrical equipment manufacturing, new energy equipment, rail transit, and industrial automation. Key applications include:

1. Core Insulation Components for Electrical Equipment

Motors / Generators: slot wedges, stator end insulation blocks, brush holders, armature parts, movable cover plates, ensuring zero insulation failure during continuous 155°C operation.

Transformers: insulation spacers, coil supports, oil duct blocks, oil-resistant and heat-stable for long service in dry-type and oil-immersed transformers.

Switchgears / Circuit breakers: phase barriers, arc chamber shields, safety baffles, combining V-0 flame retardancy and arc resistance for safe high-voltage system operation.

2. Key Materials for New Energy Equipment

EV drive motors: slot insulation, phase insulation, busbar supports, heat-resistant (≤155°C) and ATF oil-resistant for high-load motor operation.

PV / Wind inverters: insulation supports, heat dissipation panels, weather-resistant to withstand outdoor temperature fluctuations and humidity.

EV charging stations: high-voltage insulation plates, terminal insulation sleeves, high dielectric strength for safe fast charging.

3. Rail Transit and Special Equipment

Rail traction motors / converters: insulation structural components, operating reliably from -40°C to 155°C and resistant to vibration for high-speed rail and metro applications.

UHV power transmission: high-voltage insulators, busbar supports, high-voltage resistant and anti-tracking to ensure stable grid operation.

4. Industrial Automation and Precision Equipment

CNC machine tool insulation parts, fixtures: dimensionally stable and wear-resistant for precision manufacturing.

Medical device insulation components, chemical equipment corrosion-resistant parts: chemically resistant and biocompatible for high-end applications.

At RDS, we stand for innovation and quality. EPGM203 undergoes strict quality control from raw material to finished product, ensuring consistent performance batch after batch. We provide not only premium insulation materials but also customized insulation solutions to enhance safety, efficiency, and service life for your equipment.