High-Performance Mica Sheet For Electrical Insulation For Bulk Buyers

By Chengrui Insulation Material Co.,Ltd
Jan 06 2026

When electrical insulation fails, the costs skyrocket—from production downtime to safety hazards. For engineers sourcing reliable insulation solutions, the material choice is not just a detail; it's a cornerstone of durability.

That is where mica sheet steps in.

Why Mica Sheet?

Mica insulation sheet is not just another insulating material. It is a naturally occurring mineral-based product that withstands temperatures exceeding 800°C, offers exceptional dielectric strength, and resists arcs, chemicals, and aging. Unlike organic films or fiber-based boards, mica sheet maintains stability under extreme thermal cycling—making it the go-to choice for heavy-duty applications.

mica sheet for electrical insulation

Key Specifications of Mica Insulation Sheet:

For bulk buyers, technical clarity is crucial. Our mica sheets for electrical insulation typically feature:

For rigid mica sheet:

Density: 1.75–2.35g/cm³, ensuring mechanical robustness.
Thickness: 0.1–5.0 mm, customizable for slot liners or phase separators.
Dielectric Strength: 15–40 kV/mm, meeting IEC 60371 standards.
Temperature Range: -200°C to +1000°C, perfect for motors and generators.

From large turbine generators to EV traction motors, mica sheet serves as:

1. Slot Liners: Protecting stator windings from abrasion and electrical stress.

2. Phase Insulation: Preventing short circuits in high-voltage coils.

3. Barrier Layers: In transformers and furnaces, where heat and voltage coexist.

If your equipment faces high temperatures, vibration, or corrosive environments, mica sheet is not an option—it's a necessity.

electrical insulation mica sheet

The Bulk Procurement Advantage: Why Partner with a Specialist?

Sourcing 1 ton or more requires a different mindset than buying small samples. Here is what a focused supplier partnership delivers:

Consistency You Can Trust: Rigorous batch-to-batch testing (including dielectric strength and thermal analysis) ensures identical performance in your production line, month after month.

Supply Chain Security: Direct-from-factory supply with transparent raw material sourcing mitigates risk and ensures on-time delivery for your large projects.

Technical Collaboration & Customization: We work with you to tailor dimensions, punching, or composite structures (e.g., mica with glass or polyester backing) to optimize your manufacturing process.

Total Cost Focus: Beyond price-per-kilo, we help you evaluate factors like reduced scrap rates, faster processing, and extended equipment life for a lower true cost.