1200°C 5–50mm

Thick mica sheet 5-50mm heavy-duty industrial insulation for furnace linings, battery thermal barriers, heavy machinery gearboxes, HV power equipment

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◆ Heavy-Duty Industrial Grade

Thick Mica Sheet — 5–50mm Heavy-Duty Industrial Insulation

1200°C Peak ≥25 kV/mm ISO 9001

Heavy-duty thick mica sheet engineered for demanding industrial applications. Withstands ultra-high temperatures up to 1200°C, with dielectric breakdown strength ≥25 kV/mm. UL94 V-0 fire-rated and ISO 9001 certified. Customizable thickness from 5mm to 50mm — ideal for furnace linings, new energy battery thermal barriers, heavy machinery components, and HV power equipment.

1200°C

Peak Temp

≥25kV/mm

Dielectric

5–50mm

Thickness

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Product Highlights

Five Core Advantages of Thick Mica Sheet

Compared to standard mica sheets, our thick-grade version delivers superior structural integrity, wear resistance, and high-temperature stability — designed for the most demanding industrial environments.

◆ 01

Outstanding Strength Performance

Superior structural rigidity compared to standard mica sheets — higher compression and impact strength. Withstands significant external forces without deformation or damage, excelling in scenarios requiring strong support capability.

◆ 02

Excellent Wear Resistance

Tough surface texture delivers low wear rate during long-term use against friction and scratching. Maintains structural integrity and performance stability — extending equipment service life and reducing replacement frequency.

◆ 03

Stable High-Temp Capability

Even in high-temperature environments, maintains both physical and chemical properties stable — no softening or cracking. Operates continuously in various high-temperature scenarios, ensuring equipment operates normally.

◆ 04

Reliable Insulation Properties

Inherits mica's excellent dielectric properties — effectively blocks current flow and prevents leakage. Provides safety assurance for industrial electrical systems, ensuring equipment operates stably in power environments.

◆ 05

Flexible Custom Services

Custom processing available for various sizes and shapes to meet different industrial scenario requirements. Adapts to installation and use requirements of various equipment — saves adaptation costs with no need for equipment modification.

◆ 06

UL94 V-0 Fire-Rated & ISO 9001

UL94 V-0 flame retardant certification ensures self-extinguishing behavior. ISO 9001 quality management certification guarantees consistent batch-to-batch manufacturing quality for global industrial exports.

◆ Why Choose Thick Mica Sheet

Engineered for Heavy-Duty Industrial Environments

Thick mica sheets offer structural advantages that standard thin sheets cannot match — extreme heat resistance, superior wear performance, and ultra-reliable dielectric protection for the most demanding applications.

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1200°C Peak Temperature

Ultra-high temperature tolerance ideal for smelting and melting furnace environments. Stable structure under extreme thermal cycling conditions.

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≥25 kV/mm Dielectric

Reliable dielectric breakdown strength for HV power equipment. Prevents arcing and leakage in transformer and switchgear applications.

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UL94 V-0 & ISO 9001

Fire-rated UL94 V-0 flame retardant certification. ISO 9001 quality management ensures consistent batch-to-batch production quality.

Technical Specifications

Thick Mica Sheet Technical Parameters

Key performance parameters of our thick mica sheet. All batches tested and certified to IEC 60371-3, UL 94 V-0, RoHS, REACH, and ISO 9001 standards.

Thick Mica Sheet Technical Data

◆ Muscovite & Phlogopite Grades · Rev. 2025

◆ Certified

Property	MuscoviteWhite	PhlogopiteGold · Higher Temp
Thickness Range	5 – 50 mm	5 – 50 mm
Continuous Operating Temp	500 °C	750 – 1000 °C
Peak Temperature	700 °C	1200 °C
Dielectric Breakdown Strength	≥ 25 kV/mm	≥ 20 kV/mm
Compression Strength	High	High
Wear Resistance	Excellent	Excellent
Water Absorption	< 1%	< 1%
Flame Retardancy	UL 94 V-0	UL 94 V-0
Quality Management	ISO 9001 Certified	ISO 9001 Certified
Other Certifications	IEC 60371-3 · RoHS · REACH	IEC 60371-3 · RoHS · REACH

Core Applications

Four Heavy-Duty Industries That Rely on Thick Mica Sheet

From heavy machinery gearboxes to HV power equipment — wherever structural strength and high-temperature insulation must work together, our thick mica sheets deliver.

Heavy Industrial Equipment

Used as insulation and wear-resistant liners in gearboxes and bearing seats of heavy machinery. Reduces friction losses between components while blocking current — ensures safety and stability during high-intensity operation, reducing equipment failure rates.

High-Temp Smelting Equipment

Effectively blocks heat transfer in smelting furnaces and melting furnaces — providing excellent thermal insulation to protect external equipment structures from high temperatures. Also used around observation windows to enhance heat and wear resistance.

Power Equipment Components

Serves as coil support structure and insulation barrier in transformers and HV switchgear. Combining high strength with dielectric properties, ensures stable coil arrangement, prevents short circuits, and improves power equipment reliability.

Building & Construction

In pipeline installation and cable routing projects, thick mica sheets wrap around exterior of pipes and cables — resisting external friction and impact while providing insulation. Ensures safe use of building infrastructure and extends service life.

Thick Mica Sheet — 5–50mm Heavy-Duty Industrial Insulation