Phlogopite Mica Rods (Mica Screws) – High-Temperature Electrical Insulation Solution

What Are Phlogopite Mica Rods?

Phlogopite mica rods (also called mica threaded rods, mica insulation rods, or mica screw rods) are rigid insulating components manufactured from high-purity phlogopite mica paper bonded with heat-resistant binders and formed under pressure. They combine excellent dielectric strength, low thermal conductivity, and stable mechanical performance under elevated temperatures, making them suitable for electrical and thermal insulation systems.

From the production photo, these appear to be machined rod-type mica products with uniform diameter and smooth surface finish, suitable for industrial assembly and custom processing.

Typical Technical Properties

Based on the supplied specification:

PropertyTypical ValueMica Content≥ 88%Bond Content≤ 12%Density1.7–2.35 g/cm³Continuous Working Temperature700°CShort-Term Temperature Resistance1000°CHeat Loss @500°C≤ 2%Heat Loss @700°C≤ 3%Flexural Strength≥ 160 N/mm²Water Absorption (24h/23°C)≤ 1%Dielectric Strength≥ 20 kV/mmVolume Resistivity (23°C)>10¹⁷ Ω·cmVolume Resistivity (500°C)>10¹² Ω·cmThermal Conductivity0.23 W/m·KFlame ClassUL 94V-0

Key Features

1. Excellent High-Temperature Stability

Phlogopite mica maintains structural integrity during continuous operation up to 700°C, with short-term resistance reaching 1000°C.

2. Superior Electrical Insulation

With dielectric strength above 20 kV/mm, mica rods are widely selected where electrical isolation and heat resistance must coexist.

3. Low Thermal Conductivity

Thermal conductivity of 0.23 W/m·K helps reduce heat transfer and protect surrounding equipment.

4. High Mechanical Strength

Flexural strength above 160 N/mm² supports machining and structural applications.

5. Moisture and Flame Resistance

Low water absorption and UL 94V-0 flame resistance improve reliability in demanding industrial environments.

Typical Applications

Industrial Furnaces

• Heating element supports
• Insulating spacers
• Thermal isolation assemblies

Induction Furnace Systems

• Coil insulation components
• Structural insulation supports
• High-temperature fixing elements

Electrical Heating Equipment

• Heater supports
• Insulated fasteners
• High-voltage insulation parts

Metallurgical Equipment

• Furnace insulation structures
• Thermal barrier components

Why Choose Phlogopite Mica Rods Instead of Conventional Insulators?

MaterialTemperatureElectrical InsulationMechanical StrengthPhlogopite Mica RodExcellentExcellentHighCeramicExcellentExcellentBrittleFiberglassMediumGoodModeratePlasticLimitedGoodModerate

Phlogopite mica rods offer a balanced combination of heat resistance, dielectric performance, and processability, especially for electrical and furnace applications.

Custom Manufacturing Options

Available customization may include:

• Diameter and length
• Threaded or smooth finish
• CNC machining
• Slotting and drilling
• Surface finishing
• Custom packaging

For quotation, normally provide:

drawing + dimensions + working temperature + voltage condition + quantity + application environment.