◆ 900°C Rated

Calcined Mica Paper - heat-treated high-temperature electrical insulation paper for motors, furnaces and aerospace applications

◆ Mica Paper Series

Calcined Mica Paper — Heat-Treated Insulation for 900°C Service

Name: Calcined Mica Paper
Brand: SZX New Materials
Availability: InStock

A high-performance insulation material produced from natural mica flakes through a specialized calcination, grinding, and papermaking process. The heat-treatment removes structural water and volatiles — pushing the continuous service temperature 200–300 °C higher than standard mica paper, while maintaining excellent dielectric properties.

900°C

Continuous Use

30kV/mm

Dielectric Strength

0.15W/m·K

Low Thermal Cond.

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Product Overview

What Is Calcined Mica Paper?

Calcined mica paper is a specialized high-temperature insulation material manufactured by subjecting high-quality natural mica flakes to a controlled calcination process. During calcination, the mica is heated to extract structural water molecules and drive off volatile components — resulting in a paper that can withstand substantially higher operating temperatures than standard mica paper without loss of dielectric integrity.

The calcined flakes are then milled, pulped and formed into continuous sheets on our dedicated paper-making lines. The result is a thin, flexible, and mechanically strong material that combines the dielectric strength of mineral mica with the convenience of paper — ideal for winding, laminating, die-cutting and wrapping around complex geometries.

At SZX New Materials, we manufacture calcined mica paper in nominal grammages from 50 g/m² to 160 g/m², with custom widths and slitting available on request. Every roll is tested in-house for dielectric strength, tensile strength, and mass loss before being pallet-packed for export.

◆ Heat-Treated

◆ Structural Detail

Key Features

Five Engineering Advantages Over Standard Mica Paper

The calcination process delivers measurable performance improvements — not marketing claims. Every property below is verified per batch in our QC laboratory.

◆ 01

Outstanding High-Temperature Resistance

Stable performance at continuous operating temperatures of 600–900 °C. Short-term resistance up to 1000 °C — 200–300 °C higher than standard mica paper.

◆ 02

Excellent Electrical Insulation

Breakdown strength of 15–30 kV/mm and volume resistivity ≥10¹⁴ Ω·cm, ensuring reliable insulation for high-voltage equipment even under thermal stress.

◆ 03

Low Thermal Conductivity

Thermal conductivity ≤0.15 W/(m·K) at 25 °C — effectively reduces heat transfer and contributes to higher energy efficiency in high-temperature systems.

◆ 04

Mechanical Durability

Strong tensile strength (≥3 MPa) and good tear resistance — maintains integrity during handling, winding, lamination and installation on converting equipment.

◆ 05

Chemical Stability

Resistant to most acids, alkalis and organic solvents. Non-hygroscopic — ensures stable long-term performance in corrosive or humid environments.

Technical Specifications

Calcined Mica Paper Technical Data

Full nominal weight range from 50 to 160 g/m². All values are verified in our in-house QC laboratory on every production batch. Custom specifications available on request.

Nominal Weight (g/m²)	Avg. Tolerance (%)	Individual Tolerance (%)	Air Permeability (s/100ml)	Penetration Time (Time)	Water-Extract Conductivity (μS/cm)	Mass Loss (%)	Tensile Strength (N/cm)	Dielectric Strength (kV/mm)
50	±3	±5	≤900	≤20	15	0.5	≥3	≥24
60	±3	±5	≤1000	≤25	15	0.5	≥3.2	≥24
70	±3	±5	≤1100	≤30	15	0.5	≥3.3	≥24
100	±3	±5	≤2100	≤55	15	0.5	≥3.9	≥26
120	±3	±5	≤3000	≤65	15	0.5	≥4.0	≥26
160	±3	±5	≤3500	≤90	15	0.5	≥6.0	≥26

Note: Dielectric strength values in the table above are the standard guaranteed minimums. Actual tested values typically reach 24–30 kV/mm at lower grammages and 26+ kV/mm at heavier grammages. For projects requiring higher dielectric performance, our calcined paper can be combined with PET or silicone binder backings — contact our engineering team for a tailored specification sheet.

Applications

Where Calcined Mica Paper Is Specified

Any application where standard mica paper would reach its thermal limit — from electric motors to jet engines to solar thermal power plants.

Electrical Engineering

Insulation for motors, transformers, and generators — especially high-temperature variants used in power plants, EV traction motors, and industrial drive systems operating above standard mica paper's thermal limit.

Aerospace & Automotive

Ideal for insulating components in jet engines, exhaust systems, and high-performance batteries where extreme temperatures are normal operating conditions. Lightweight, reliable, and flame-resistant.

Industrial Furnaces & Kilns

Lining material for industrial kilns, smelting furnaces and heat-treatment equipment — protecting structural components from direct thermal damage while maintaining electrical isolation where needed.

Renewable Energy

Insulation systems for concentrated solar power (CSP) thermal plants and geothermal equipment — able to endure the sustained high temperatures generated during energy conversion processes.

◆ Calcined vs Standard Mica Paper

Is Calcined Mica Paper Right for Your Application?

Both grades offer excellent electrical insulation — but the calcination process makes a measurable difference when temperature, fire survival, or long-term reliability is critical. Here's when to choose each:

◆ Choose Calcined Mica Paper When
Operating Above 500 °C
Continuous service temperature 600–900 °C
Fire-survival cables requiring IEC 60331 / BS 6387
Aerospace, EV traction, or solar thermal applications
Low mass-loss required (0.5% vs 0.4% typical)
Long-term thermal cycling stability is critical

◆ Standard Mica Paper Is Sufficient When

Operating Below 500 °C

Standard motor, transformer, capacitor insulation
Home appliances with moderate heat (iron, dryer)
General-purpose electrical insulation
Cost-sensitive applications (calcined is premium priced)
No fire-resistance certification required

Calcined Mica Paper — Heat-Treated Insulation for 900°C Service

What Is Calcined Mica Paper?