SHS H-Class Polyimide Prepreg Material | B-Stage High-Temperature Resistant Insulation for Dry Transformers & Motors

SHS H-Class Polyimide Prepreg Material is a top-tier B-stage semi-cured flexible insulation solution specifically engineered for ultra-high temperature and extreme electrical environments. It is meticulously manufactured by uniformly immersing an advanced polyimide film heat-resistant composite substrate into a specialized H-grade high-temperature adhesive solution, followed by precisely controlled thermal baking into a stable, non-sticky semi-cured state.

Designed to withstand severe thermal loads, SHS cross-links completely into a solid monolithic matrix during final equipment baking. It creates a seamless, tightly sealed, and permanent insulating layer over copper or aluminum conductors, ensuring long-term systemic stability.

Key Features & Advantages 

• Extreme H-Class Thermal Endurance: Capitalizes on the legendary heat resistance of polyimide, allowing continuous safe operations under severe high-temperature cycles without structural degradation.

• Optimized B-Stage Crosslinking Chemistry: Precision-controlled volatile content (≤1.5%) and premium soluble resin profile (≥45 g/m²) eliminate the risk of bubbles or outgassing during curing, achieving an ultra-dense layer.

• Outstanding Tensile & Shear Bonding: Possesses exceptional mechanical properties with a tensile shear strength of ≥23.0 MPa, providing powerful permanent adhesion to copper/aluminum surfaces to counter severe electromagnetic vibrations.

• High Reliability Dielectric Profile: Delivers exceptional breakdown voltage safety vectors (up to ≥9 KV for 0.30mm thickness), ensuring stable insulation barriers between high-stress turns.

Typical Applications 

SHS polyimide prepreg is highly recommended for high-end heavy-duty electrical applications:

• H-Class Dry-Type Transformers: The premier wrapping option for interlayer insulation partitions in low-voltage copper or aluminum foil-wound coils.

• Traction & Heavy Industrial Motors: Extensively applied for high-vibration motor inter-turn insulation wrapping, slot lining, and liner cushioning.

• Molded & Tubular Components: Serving as an ideal basic laminating substrate for rolling premium high-temperature laminated insulation tubes and fabricating special-shaped structural parts.

Technical Data Sheet 

Thickness Range: 0.18mm – 0.30mm (Total range: 0.11mm - 0.40mm available) | Width Range: 5mm – 1500mm (Custom slitting available)