1000°C 3–20mm

Thick mica plate 3-20mm for industrial furnaces, HV transformers and heavy machinery insulation

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◆ Mica Plates Series

Thick Mica Plate — Structural Industrial Insulation Board

3–20mm Thick ≥200 MPa Bending UL94 V-0

Heavy-duty mica insulation plate designed for applications requiring both electrical insulation and structural support. Thickness from 3mm up to 20mm (customizable to 150mm) delivers exceptional bending strength (≥200 MPa) and dimensional stability. Available in muscovite and phlogopite grades — for industrial furnaces, HV transformers, and heavy machinery.

500–900°C

Temperature

15–30kV/mm

Dielectric Strength

>200MPa

Bending Strength

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Key Features

Six Properties That Define Heavy-Duty Insulation

Engineered for applications where thinner boards fail. Every property is verified per batch in our in-house QC laboratory.

◆ 01

Superior Structural Strength

Thickness 3mm or above with high bending strength (≥120 MPa, tested values >200 MPa). Withstands heavy loads and vibration without deformation — reliable spacer or divider material in large machinery.

◆ 02

Enhanced Heat Resistance

Stable performance at continuous working temperatures from 400°C to 1000°C (depending on mica type). Outperforms thinner boards in extreme high-temperature environments like kilns and casting equipment.

◆ 03

High Electrical Insulation

Dielectric strength 15-30 kV/mm — suitable for medium and high-voltage systems (10 kV-50 kV). Effectively prevents arcing and short circuits in power distribution equipment.

◆ 04

Flame Retardant

Classified as non-combustible per UL94 V-0 standard. Flame retardant with no release of toxic fumes — ensures safety in enclosed industrial environments.

◆ 05

Excellent Dimensional Stability

Low thermal expansion coefficient (≤7×10⁻⁶/°C) minimizes warping under temperature fluctuations — maintains precise fit during long-term service.

◆ 06

Chemical & Moisture Resistance

Resistant to oils, weak acids, and alkalis. Water absorption ≤1.0% — ensures long service life in humid or chemically aggressive industrial environments.

Dimensions & Format

Specifications & Custom Options

Standard and custom dimensions available. Precision-machined for tight tolerances in large-scale equipment integration.

◆ Dimensional Range

Standard & Custom Specifications

◆ 01

Thickness

3–20mm

Standard range. Custom thicknesses up to 150 mm available on request.

◆ 02

Sheet Size

400–1200mm

Standard sizes from 400×400mm to 1200×1200mm. Custom cutting for large equipment.

◆ 03

Density

1.8–2.3g/cm³

Balanced strength and weight for heavy-duty applications.

◆ 04

Thermal Expansion

≤7×10⁻⁶/°C

Ultra-low expansion for long-term dimensional stability.

Resin System Options

Choose Silicone or Epoxy Based on Your Temperature Requirement

Two resin systems engineered for different temperature classes and cost targets. Our engineering team helps you pick the right one.

◆ Option A · Premium Temperature

Silicone Resin Binder

Maximum temperature resistance for extreme environments. The go-to choice when continuous service temperature exceeds 500°C — industrial furnaces, metallurgy equipment, and casting operations.

Max TempUp to 1000°C

Cost ProfilePremium

◆ Option B · Cost-Effective

Epoxy Resin Binder

Cost-effective performance for moderate temperature applications. Ideal for HV transformers, motor windings, and industrial equipment operating below 500°C.

Max TempUp to 500°C

Cost ProfileEconomical

Technical Data

Muscovite vs Phlogopite · Full Comparison

Both grades are manufactured to the same physical standard — the choice comes down to temperature class. Full batch-level verified parameters below.

Thick Mica Plate Technical Data

◆ Muscovite & Phlogopite Grades

◆ Verified Per Batch

Parameter	Unit	Thick Muscovite Mica PlateSilver White	Thick Phlogopite Mica PlateAmber · Higher Temp	Test Method
Mica Paper Type	/	Muscovite	Phlogopite	/
Mica Content	%	≥ 90	≥ 90	IEC 60371-2
Binder Content	%	≤ 10	≤ 10	IEC 60371-2
Density	g/cm³	2.0 – 2.35	2.0 – 2.35	IEC 60371-2
Temperature (Continuous Use)	°C	500	750	/
Temperature (Intermittent Use)	°C	700	900	/
Heat Loss at 500°C	%	≤ 3.5	≤ 3.5	IEC 60371-2
Heat Loss at 700°C	%	≤ 2	≤ 2	IEC 60371-2
Bending Strength	MPa	> 200	> 200	GB/T 5019.2
Compressive Strength	MPa	> 300	> 300	Internal Method
Water Absorption	%	< 1	< 1	GB/T 5019.2
Dielectric Strength	kV/mm	≥ 15	≥ 14	IEC 60243-1
Flame Retardancy	/	UL94 V-0	UL94 V-0	UL94
Volume Resistivity	Ω·cm	>10¹⁷ (23°C) >10¹² (500°C)	>10¹⁷ (23°C) >10¹² (500°C)	IEC 60093
Thickness Range Tolerance: 2-7mm ±8/-6% · 8-30mm ±7/-5% · 31-150mm ±5/-3%	mm	2 – 150	2 – 150	/

Applications

Three Industries Where Thick Mica Plate Excels

Specified when thinner plates can't deliver both structural support and insulation performance under heavy load.

Industrial Kilns & Furnaces

Used as insulation linings, door seals, and heat shields for high-temperature furnaces — protecting structural components from extreme heat and reducing energy loss.

Large Transformers & Generators

Used as thick insulation layers between windings and core structures in power generation equipment — providing both electrical insulation and mechanical support simultaneously.

Heavy Machinery

Used as insulation spacers in hydraulic systems, large motors, and mining equipment — where durability and vibration resistance are essential for long-term operation.

Thick Mica Plate — Structural Industrial Insulation Board