A Mica Sheet, also known as mica plate or mica insulator, is a high-performance insulating material manufactured from natural or synthetic mica splittings. These splittings are bonded together using high-temperature resistant binders to form rigid or flexible sheets. Renowned for its exceptional combination of thermal stability, electrical insulation, and mechanical strength, mica is a critical component in countless industrial and technological applications where reliability under extreme conditions is non-negotiable. Kaxite specializes in engineering these sheets to meet the most demanding specifications, ensuring optimal performance and safety.
Choosing Kaxite mica sheets provides engineers and designers with a robust material solution. Here are the primary benefits:
Kaxite offers a comprehensive range of mica sheets tailored for different applications. Our products are categorized primarily into Rigid Mica Sheets (also known as Commutator V-Rings or Heater Plates) and Flexible Mica Sheets. Below are the detailed specifications.
These are hard, punchable sheets used for insulating segments in commutators, heater elements, and high-temperature structural components.
| Parameter | Standard Grade | High-Temperature Grade | Premium Electrolytic Grade |
|---|---|---|---|
| Base Material | Natural Muscovite Mica | Natural Phlogopite Mica / Synthetic Mica | Selected Natural Muscovite Mica |
| Binder Type | Silicone Resin | Inorganic Silicate / Special High-Temp Resin | Epoxy or Modified Silicone Resin |
| Continuous Use Temperature | Up to 700°C (1292°F) | Up to 900°C (1652°F) / 1000°C (1832°F) for Synthetic | Up to 600°C (1112°F) |
| Thickness Range | 0.15mm - 50mm | 0.2mm - 25mm | 0.3mm - 5mm |
| Density | 1.8 - 2.2 g/cm³ | 1.9 - 2.3 g/cm³ | 2.0 - 2.4 g/cm³ |
| Dielectric Strength (kV/mm) | 15 - 25 | 18 - 28 | 20 - 35 |
| Key Applications | Industrial heaters, toasters, hair dryers | Foundry equipment, aerospace, high-temp furnaces | Electric motor commutators, V-rings |
| Kaxite Product Code | KX-RMS Series | KX-HTP / KX-SYN Series | KX-ELC Series |
These are pliable sheets made from reconstituted mica paper, offering excellent conformity for wrapping and lining irregular surfaces.
| Parameter | Flexible Muscovite | Flexible Phlogopite | Synthetic Mica Flexible |
|---|---|---|---|
| Base Material | Muscovite Mica Paper | Phlogopite Mica Paper | Synthetic Fluorophlogopite Paper |
| Binder & Carrier | Silicone Resin + Glass Cloth | Silicone Resin + Polyimide Film | Inorganic Binder + Glass Cloth |
| Continuous Use Temperature | Up to 600°C (1112°F) | Up to 800°C (1472°F) | Up to 1000°C (1832°F) |
| Thickness Range | 0.1mm - 2.0mm | 0.15mm - 1.5mm | 0.2mm - 1.0mm |
| Tensile Strength | > 100 N/cm width | > 90 N/cm width | > 120 N/cm width |
| Dielectric Strength (kV/mm) | 15 - 20 | 12 - 18 | 18 - 25 |
| Flexibility | Excellent, can be wound | Good | Very Good |
| Key Applications | Motor slot liners, cable wrapping, pipe insulation | Welding equipment, furnace curtains | Nuclear, aerospace, high-purity semiconductor processes |
| Kaxite Product Code | KX-FMS Series | KX-FPH Series | KX-FSY Series |
This table provides a comparative overview of the core physical and electrical properties of standard Kaxite mica sheet materials.
| Property | Test Method | Typical Value (Rigid Muscovite) | Typical Value (Flexible w/Glass Backing) |
|---|---|---|---|
| Density | ASTM D792 | 2.1 g/cm³ | 1.9 g/cm³ |
| Water Absorption (24h) | ASTM D570 | < 0.5 % | < 1.0 % |
| Thermal Conductivity | ASTM C177 | 0.4 - 0.7 W/m·K | 0.3 - 0.5 W/m·K |
| Coefficient of Thermal Expansion | ASTM E831 | 8 - 12 x 10-6/K | 10 - 15 x 10-6/K |
| Volume Resistivity | IEC 60093 | > 1 x 1013 Ω·cm | > 1 x 1012 Ω·cm |
| Dielectric Strength (at 25°C) | ASTM D149 | 20 kV/mm | 18 kV/mm |
| Comparative Tracking Index (CTI) | IEC 60112 | > 600 V | > 500 V |
Muscovite mica (clear or white mica) offers superior dielectric strength and lower thermal endurance (up to ~700°C). Phlogopite mica (amber mica) provides higher continuous operating temperatures (up to ~900°C) and better resistance to heat shock, but with slightly lower electrical properties. Kaxite experts can help you select the right type based on your application's dominant stress factor.
Yes, rigid mica sheets are highly machinable. They can be accurately punched, stamped, drilled, laser-cut, or CNC machined into complex shapes like commutator segments, washers, and gaskets with clean edges and minimal delamination. Kaxite supplies sheets in standard panels or custom pre-cut parts to your exact drawings.
Mica is a naturally inert, non-toxic mineral. When bonded with FDA-compliant or high-purity binders, certain grades of Kaxite mica sheets are suitable for food warming equipment, medical device insulation, and other applications requiring material safety certification. It is crucial to specify this requirement when ordering.
Choose rigid sheets for structural components requiring dimensional stability and high punchability, such as insulating plates in heaters or commutator V-rings. Opt for flexible mica sheets when you need to wrap, line, or insulate curved surfaces, such as motor armatures, cables, or irregular furnace interiors. Kaxite offers both forms with various backing materials for optimal performance.
Delamination can occur due to excessive moisture absorption, thermal cycling beyond the binder's rating, or mechanical overstress. Prevention includes specifying the correct grade for the operating environment (e.g., moisture-resistant binders), ensuring the operating temperature stays within limits, and using appropriate fabrication techniques. Kaxite's technical support can advise on grade selection to prevent such issues.
No, mica sheet itself is an excellent insulator and does not conduct electricity to generate heat. It is, however, the preferred substrate material for supporting etched foil or wire-wound heating elements in appliances like space heaters and hair dryers due to its insulation and thermal stability.
Synthetic mica (fluorophlogopite) is manufactured in a lab, offering superior purity, consistency, and even higher temperature resistance (exceeding 1000°C) than natural mica. It is free of metallic impurities, making it ideal for critical applications in aerospace, semiconductors, and high-vacuum environments. For most industrial applications, high-quality natural mica from Kaxite is a cost-effective and reliable solution.
To ensure an accurate quote and product recommendation, please provide: 1) A detailed drawing or sketch with all dimensions and tolerances, 2) The operating environment (max temperature, voltage, presence of chemicals/oils), 3) The required quantity, 4) Any specific certifications needed (e.g., UL, RoHS). Our engineering team will then suggest the optimal Kaxite mica grade and fabrication method.
