Mica Paper is widely recognized as a “core material” in high-temperature electrical insulation applications. With its outstanding thermal resistance, electrical insulation performance, and stable chemical properties, it plays a critical role in modern electrical, industrial, and high-tech engineering systems.
Mica Paper is manufactured using high-quality white mica, phlogopite mica, or synthetic mica as raw materials. The material is processed through chemical or mechanical pulping, followed by paper-forming, slitting, and rewinding into continuous rolls.
The development of Mica Paper has significantly strengthened the electrical insulation industry by combining excellent natural mica properties with improved manufacturability and cost efficiency.
From a material performance perspective, muscovite mica shows a thermal weight loss of only 0.4% at 700°C, while phlogopite mica exhibits only 0.3% at 900°C. This allows Mica Paper to inherit the excellent high-temperature resistance of natural mica while offering lower production cost and tighter thickness tolerance, making it an ideal material for electrical insulation applications.
The production of Mica Paper typically includes the following key steps: crushing, classification, pulping, sheet forming, pressing, drying, and finishing.
Crushing is the foundation of the process. Proper crushing methods ensure that mica flakes maintain their physical structure, producing uniform particle size and high aspect ratio without damaging natural properties.
Classification is a critical step used to remove oversized or unsuitable particles, ensuring only mica flakes suitable for papermaking are retained.
Pulping is the core process stage. After classification, qualified mica powder is mixed in controlled ratios to form a stable slurry, which is then used to produce high-performance Mica Paper with consistent electrical and thermal properties.
HP-5 rigid mica sheet is a silver-white high-temperature insulation material. It offers a continuous operating temperature of 500°C and short-term resistance up to 850°C.
HP-8 rigid mica sheet is a gold-colored high-temperature insulation material. It provides a continuous operating temperature of 850°C and short-term resistance up to 1050°C.
Excellent high-temperature insulation performance, with maximum resistance up to 1000°C depending on application conditions.
Outstanding electrical insulation properties, with dielectric breakdown strength reaching up to 20 kV/mm for standard products.
Strong bending strength and excellent machinability, allowing punching and forming into complex shapes without delamination.
Environmentally friendly performance, asbestos-free, with low smoke generation and minimal odor during heating.
Based on mica substrates, various processing methods can be applied, including rolling, punching, turning, drilling, grinding, milling, and mold pressing.
According to customer requirements, mica materials can be fabricated into a wide range of customized components, such as mica gaskets, mica discs, mica flanges, mica tiles, mica boxes, mica fixtures, gasket assemblies, and other irregular geometries including grooved, drilled, angled, and complex structural parts.
Mica Paper has a wide range of industrial applications across multiple sectors.
In the electrical industry, Mica Paper is a critical insulation material widely used in motors, generators, transformers, and power systems.
It is used as the base material for mica tape in motor manufacturing, combined with reinforcing materials to produce insulation systems with excellent electrical and mechanical performance, improving equipment reliability and service life.
In transformers, Mica Paper serves as an insulation layer that effectively prevents current leakage and short circuits, ensuring safe and stable operation.
In cables and high-voltage transmission systems, Mica Paper provides insulation protection and environmental resistance, significantly improving durability and operational stability.
In aerospace engineering, material selection is critical for safety and performance. Mica Paper is widely used as thermal insulation and fire protection material in aircraft and rocket systems.
Its lightweight nature helps reduce overall system weight, while its high thermal stability and electrical insulation properties protect sensitive onboard components.
In rocket engine systems, where extreme temperatures are generated, Mica Paper provides essential thermal protection to ensure stable operation under severe conditions.
Chemical production environments often involve high temperature, pressure, and corrosive substances. Mica Paper provides excellent chemical stability and thermal resistance in such conditions.
It is used in reactors as thermal insulation to improve energy efficiency and protect equipment walls from corrosion, extending service life.
In pipelines, Mica Paper helps reduce heat loss while providing corrosion resistance, ensuring continuous and stable chemical production.
In metallurgical applications, high-temperature furnaces are essential equipment. Mica Paper plays an important role in improving thermal efficiency and reducing energy consumption.
It is widely used as insulation and fire protection material in furnace linings, reducing heat loss and enhancing energy utilization.
It is also used to protect temperature measurement components such as thermocouples, ensuring accurate readings in harsh environments.
Easy installation with smooth sliding surfaces, higher mechanical strength, and longer service life, reducing downtime and crucible damage.
Available in multiple product forms. Phlogopite mica composite fiber offers improved strength and performance without delamination.
Superior thermal stability, excellent insulation, and high-temperature resistance with stable quality performance.
Effectively protects induction coils and extends the service life of furnace lining systems.
YILONG provides high-quality Mica Paper materials and precision-machined insulation components for global customers in electrical, industrial, energy, and high-temperature engineering applications.
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Mica Paper is widely recognized as a “core material” in high-temperature electrical insulation applications. With its outstanding thermal resistance, electrical insulation performance, and stable chemical properties, it plays a critical role in modern electrical, industrial, and high-tech engineering systems.
In the field of non-standard component manufacturing, material selection often defines the performance limits and application scope of the final product. As a high-performance electrical insulation material, Mica Board is bringing breakthrough solutions to custom-engineered parts across multiple industries due to its outstanding heat resistance, electrical insulation performance, and mechanical stability.
Epoxy Glass Sheet is manufactured using electronic-grade alkali-free fiberglass fabric impregnated with epoxy resin and other modified materials, followed by high-temperature and high-pressure lamination. Epoxy Glass Sheets feature excellent electrical insulation, flame retardancy, high temperature resistance, and strong mechanical performance.
FR-4, which we commonly refer to in the PCB industry, is not actually a specific material name. It is a flame-retardant grade designation.
Phenolic Cotton Cloth Laminate is manufactured by impregnating cotton fabric with phenolic resin, followed by curing under heat and pressure. It is classified as a Thermal Class E insulating material and provides excellent mechanical properties, oil resistance, and reliable dielectric performance.
Epoxy Sheets are widely used in electrical and electronic applications due to their excellent combination of heat resistance, corrosion resistance, wear resistance, light weight, and electrical insulation properties.
Bakelite sheet, also known as Phenolic Paper Laminated Sheet, is manufactured using high-quality bleached wood pulp paper and cotton linter paper as reinforcing materials. These substrates are impregnated with phenolic resin produced from high-purity synthetic petrochemical raw materials and then processed through heat and pressure lamination.
Electrical resistance is the reciprocal of conductance, and resistivity refers to the resistance per unit volume of a material. The lower the conductivity of a material, the higher its resistance. For Electrical Insulation Materials, higher resistivity is always preferred. A higher resistivity indicates better insulation performance and lower leakage current under electrical stress.
If you're struggling to choose among various electrical insulation materials, this guide compares five commonly used laminated insulation sheets: 3240 epoxy sheet, FR4 Fiberglass Sheet, Bakelite Sheet, Phenolic Cotton Cloth Laminate, and Phenolic paper laminate, helping you quickly identify the most suitable material for your application.
Is your microwave oven suddenly failing to work? Are high-temperature industrial machines experiencing frequent breakdowns? In many cases, the problem may be traced back to a critical component—the mica board.
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