◆ 700°C Rated

Phlogopite Mica Paper - natural amber magnesium-rich mica insulation paper for fire-resistant tapes, furnaces and high-temperature motors

◆ Mica Paper Series

Phlogopite Mica Paper — Amber High-Temperature Mica

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

A specialty insulation material made from natural phlogopite — a magnesium-rich mica — through grinding, pulping and forming. The only natural mica paper that performs reliably at 700 °C continuous service, outperforming muscovite by 100–200 °C. Flexible, thin, and the go-to material for fire-resistant tapes and furnace insulation.

700°C

Continuous Use

25kV/mm

Dielectric Strength

0.05–0.2mm

Thickness Range

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Product Overview

What Is Phlogopite Mica Paper?

Phlogopite mica paper is a specialty high-temperature insulation material manufactured from natural phlogopite — a magnesium-rich variant of natural mica — through grinding, pulping and wet-laid forming. Its distinctive amber-to-brown color comes from the mineral's natural magnesium and iron content.

Phlogopite delivers a unique combination of heat resistance and electrical insulation that remains stable in harsh environments where standard muscovite mica paper would degrade. With a thin, flexible structure (typically 0.05–0.2 mm in thickness), it integrates easily into complex assemblies — from coil windings to furnace linings — making it a foundational material in industrial insulation systems.

At SZX New Materials, our phlogopite mica paper is manufactured in nominal grammages from 65 g/m² to 160 g/m², with custom widths and slitting available. It is also the base material for our fire-resistant mica tapes used in IEC 60331 / BS 6387 compliant cables.

Specialty Grade: Phlogopite Mica Paper for Fire-Resistant Tapes

We offer a specialized phlogopite grade engineered specifically for fire-resistant cable tapes — optimized binder content, higher tensile strength, and tighter thickness tolerance. Ask our team about specification sheets for the fire-tape grade.

Key Features

Five Engineering Advantages of Phlogopite Mica Paper

The magnesium-rich crystal structure delivers measurable high-temperature performance — verified per batch in our QC laboratory.

◆ 01

Exceptional Heat Resistance

Reliable operation up to 700 °C continuous (800 °C short-term peak) — outperforming muscovite mica paper by 100–200 °C. Ideal for high-temperature industrial processes.

◆ 02

Strong Electrical Insulation

Dielectric strength of 12–25 kV/mm and volume resistivity ≥10¹³ Ω·cm, ensuring safe operation in high-voltage equipment even at elevated temperatures.

◆ 03

Thermal Stability

Low thermal conductivity of 0.12–0.18 W/(m·K) minimizes heat transfer and reduces energy loss in furnaces, motors, and power-system insulation structures.

◆ 04

Mechanical Flexibility

Tear-resistant and easy to cut, wrap or laminate. Conforms to irregular surfaces such as motor windings, furnace linings, and cable geometries.

◆ 05

Chemical Resistance

Resists moisture, oil, and weak alkali. Maintains integrity in humid or industrial environments — extending equipment service life significantly.

Technical Specifications

Phlogopite Mica Paper Technical Data

Standard nominal weight range from 65 to 160 g/m². All values are verified in our in-house QC laboratory per production batch. Custom specifications, including fire-tape grade, 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)
65	±3	±5	≤300	≤9	10	0.3	≥7	≥16
75	±3	±5	≤320	≤10	10	0.3	≥7	≥16
100	±3	±5	≤340	≤11	10	0.3	≥7	≥16
120	±3	±5	≤380	≤17	10	0.3	≥9	≥16
150	±3	±5	≤450	≤22	10	0.3	≥12	≥16
160	±3	±5	≤500	≤25	10	0.3	≥12	≥16

Note: The 16 kV/mm dielectric strength value in the table above is the standard guaranteed minimum. Actual tested values typically reach 20–25 kV/mm depending on grammage. Phlogopite mica paper also has superior tensile strength (7–12 N/cm) compared to muscovite — this is why it's preferred as the base material for fire-resistant cable tapes. Contact our engineering team for a specification sheet optimized for your application.

Applications

Where Phlogopite Mica Paper Is Specified

From power plant generators to jet engine components — phlogopite is the material of choice wherever sustained temperatures exceed 500 °C.

Electrical Engineering

Used as insulation material in high-temperature motors, transformers, and generators — especially in power plants and heavy-duty industrial machinery where sustained thermal loading demands phlogopite's performance envelope.

Metallurgy & Foundry

Lining material for kilns, smelting equipment, and heat-treatment furnaces — providing thermal insulation and protecting structural components from extreme heat in metal processing operations.

Aerospace & Automotive

Integrated into engine components, exhaust systems, and battery insulation — where heat resistance and vibration resistance are both mission-critical. Especially favored in EV traction motor insulation.

Industrial Heating

Applied in heating elements, boilers, and thermal reactors — improving efficiency and safety through reliable, long-life insulation at operating temperatures where muscovite would degrade.

◆ Temperature Advantage

+200°Cvs Muscovite Mica Paper

Same flexibility, same workability
— but 200 °C more thermal headroom.

Why Choose Phlogopite

The Natural Mica of Choice for 500–700 °C Service

Phlogopite mica paper sits in a unique position in our mica paper lineup: it bridges the gap between standard muscovite (up to 500 °C) and calcined/synthetic premium grades (900–1200 °C).

If your application operates reliably between 500 and 700 °C continuous, phlogopite delivers the best cost-to-performance ratio — no expensive heat treatment required, no synthetic crystal manufacturing cost, just natural mineral mica performing at its best.

It's also the industry-standard base material for fire-resistant cable tapes — which require both thermal survival AND mechanical robustness during cable production winding operations.

Preferred for 500–700 °C continuous applications
Industry-standard base for fire-resistant cable tapes
Higher tensile strength than muscovite (7–12 N/cm)
Cost-effective vs calcined/synthetic grades

Phlogopite Mica Paper — Amber High-Temperature Mica

What Is Phlogopite Mica Paper?

Specialty Grade: Phlogopite Mica Paper for Fire-Resistant Tapes