High-Temperature Epoxy Resin System for Electrical Insulation APG & Vacuum Casting

The LE-9229/LH-9229 epoxy resin system is a dual-component, modified rubber-toughened formulation designed for demanding electrical insulation applications. Combining LE-9229 epoxy resin and LH-9229 hardener at a precise 1:1 ratio (100 pbw each) with silica flour filler (280-340 pbw), this system delivers exceptional thermal stability (Tg 105-125°C), crack resistance, and mechanical strength. Ideal for medium/high-voltage insulation (10-35kV), it supports both automatic pressure gelation (APG) and vacuum casting processes, making it suitable for transformers, solid-pole bushings, and switchgear components.

Key Features & Advantages

Ultra-High Thermal Resistance:

Glass transition temperature (Tg): 105-125°C

Thermal decomposition: >320°C

Low water absorption: 0.08-0.20% (23°C to 100°C)

Superior Electrical Insulation:

Volume resistivity: 10¹⁵ Ω·cm

Dielectric strength: 30 kV/mm

Loss factor: 0.02

Robust Mechanical Properties:

Tensile strength: 65-95 MPa

Flexural strength: 110-150 MPa

Impact resistance: 10-18 kJ/m²

Process Flexibility:

Optimized for APG injection (10-30 min gelation) and vacuum casting (3-6 hr cure).

Low curing shrinkage (0.7-0.9%) ensures dimensional stability.

Technical Parameters

Component Properties

Cured System Performance

Processing Guidelines

Frequently Asked Questions (FAQ)

Q1: What filler is recommended for LE-9229?

A: Use 400-mesh silica flour at 280-340 pbw to enhance mechanical strength and thermal conductivity.

Q2: Can LE-9229 withstand high-voltage environments?

A: Yes, its dielectric strength (30 kV/mm) and volume resistivity (10¹⁵ Ω·cm) make it ideal for 10-35kV insulation.

Q3: How does APG differ from vacuum casting?

A: APG uses pressure (0.5-5 bar) for rapid production (10-30 min gelation). Vacuum casting eliminates bubbles for precision parts but requires longer curing (3-6 hrs).

Q4: Is this system flame-resistant?

A: Yes, rated HB (4mm) and V1 (12mm) under flammability tests.

Shanghai Wenyou Industry Co., Ltd.mainly engaged in the advanced materialsof MV and HV insulation products for indoorand outdoor use, both suitable for APG andvacuum casting.

Our wide range of products includes epoxy resin, flame retardant resin, curing agents, outdoor modifiers, toughening agents, epoxy paste, demoulding agents, and fillers.

We have obtained ISO9001, ISO14001, SGS, and UL certifications, and our products comply with ROHS and REACH safety regulations.

Our high-quality products are used in high voltage electrical insulation applications and are exported globally. We are committed to providing stable products and excellent service to the global electricity industry.

High Quality Electrical Raw Materials
Epoxy resin

Release agent

Silica powder
Hardener
Color paste
Flexibilizer