A Complete Guide: How to Choose Mica Tapes, Sheets & Tubes

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2026-06-23 08:30

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With high heat resistance, excellent insulation and low smoke output, mica products serve extensively in cables, home appliances, industrial furnaces, new energy and rail transit. The three main types — mica tapes, sheets and tubes — differ in form and use. This overview covers their properties and selection tips for quick matching.

 

Basic Classification of Product Categories

 
 
 
 

 

品类 Category形态特点 Features核心用途 Main Applications
云母带 Mica TapeThin coiled material with high flexibilityWinding for cables and coils, mainly for fire-resistant insulation
云母板 Mica SheetPlate material, available in hard / soft typesThermal insulation gaskets, structural partitions and supports for heating components
云母管 Mica TubeRigid hollow tubular materialSleeve-type insulation protection for electrodes and wire outlets

 

Performance & Application of Subdivided Products

 
 
 
 

 

(I) Mica Tape

 

As a core material for fire-resistant cables, mica tape falls into four types by material. Reinforced with glass fiber and films, it is applicable to diverse working conditions.

Phlogopite Mica Tape

 

It features a temperature resistance of around 750℃, stable insulation and cost-effectiveness. It is ideal for cables in civil buildings and ordinary fire-resistant cables. The three-in-one structure delivers better moisture resistance, making it the preferred choice for outdoor and humid environments.

Synthetic Mica Tape

 

Boasting high purity, it can withstand temperatures up to 1100℃ with excellent insulation and anti-aging properties. It is widely used for high-end special cables in subways, super high-rise buildings, ships and other facilities.

Calcined Mica Tape

 

Impurities and crystal water are removed during processing, so it offers reliable fire resistance and high tensile strength. It is primarily applied to high-standard fire-resistant cables for marine, nuclear power, aerospace and other fields.

Tray Mica Tape

 

With soft texture and excellent conformability during wrapping, it resists acid, alkali and radiation. It suits precision flexible cables and cables operating under special working conditions.

 

(II) Mica Sheet

 

Mica sheets are divided into hard and soft series. They can be cut, stamped and bent, and are widely used as insulating components for electric heating equipment.

Hard Mica Sheet (Series 505/506)

 

It offers a continuous temperature resistance of 500~700℃ and an intermittent temperature resistance up to 900℃, featuring high mechanical strength and outstanding voltage resistance. It is applied to heating supports for household appliances such as hair dryers, microwave ovens and electric irons, as well as thermal insulation gaskets for metallurgical equipment and locomotives.

Soft Mica Sheet

 

Flexible and rollable, it resists cracking when bent. With low smoke emission and good environmental performance, it is commonly used for curved surface fitting on transformers, electric heat guns and other equipment.

Supplement: Muscovite mica sheets are designed for general insulation applications. Phlogopite mica sheets provide better heat resistance, while synthetic mica sheets are suitable for ultra-high temperature environments.

 

(III) Mica Tube

 

Manufactured by rolling and curing mica paper, mica tubes are available in customized specifications and specially designed for tubular insulation protection.

Muscovite Mica Tube

 

It delivers excellent insulation performance and moderate temperature resistance, and serves as outlet bushings for general motors and small electrical appliances.

Phlogopite Mica Tube

 

Featuring great heat resistance and deformation resistance, it is ideal for electrode insulation protection of industrial electric smelting furnaces and high-power high-temperature equipment.

 

 

Core Performance Comparison

 
 
 
 

 

Comparison Items云母带 Mica Tape硬质云母板 Hard Mica Sheet软质云母板 Soft Mica Sheet云母管 Mica Tube
Maximum Temperature Resistance750~1100℃500~900℃500~900℃550~1000℃
FlexibilityExcellentPoorGoodPoor
Insulation PerformanceMedium to HighOutstandingOutstandingRelatively High
ProcessabilityOnly slittingCutting, stamping, etc.Rollable & formableOnly length cutting
Application MethodWinding &WrappingLaying flat for support / isolationCurved surface fittingSleeving for protection

 

Rapid Selection by Application Scenarios

 
 
 
 
Cables & Wires: Phlogopite mica tape for ordinary cables; synthetic mica tape for high-grade fire-resistant cables; calcined mica tape for special high-end cables.
 
Home Appliances: Hard mica sheets for heating supports and partitions; soft mica sheets for flexible heating components.
 
Industrial Furnaces / Metallurgical Equipment: Thick mica sheets for furnace thermal insulation; high-temperature grade mica tape for circuit protection; phlogopite mica tubes as electrode sleeves.
 
Motors / Transformers: Mica tape for coil wrapping; hard mica sheets for housing gaskets; standard mica tubes for lead-out wires.
 
New Energy / High-end Equipment: Synthetic mica products are recommended uniformly to meet requirements of high temperature resistance and superior insulation.

 

 

Selection & Quality Inspection Tips

 
 
 
 
If the operating temperature exceeds 800℃, avoid conventional phlogopite mica products and prioritize synthetic or calcined mica grades.
Product category is determined by installation method: choose mica tape for winding applications, mica sheet for structural support, and mica tube for sleeving protection; cross-category substitution is not recommended.
Simplified quality inspection criteria: qualified products shall have smooth surfaces free of powder shedding, delamination and cracking. They shall generate no smoke or peculiar odor and remain free of melting or deformation after high-temperature testing.

 

Core Idea for Product Selection

 
 
 
 

Mica tape is a flexible fire-resistant wrapping material; mica sheet serves as a structural thermal-insulating and insulating substrate; mica tube is a dedicated tubular protective component. For product selection, first clarify the application scenario as well as temperature and voltage resistance requirements, then match the corresponding material grade and specification with consideration of safety, performance and cost.

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