Choose by installation space and insulating requirement
Standard for wire & cable insulation
Space-efficient for bus bars
For flat-space installations
For slot & channel installation
A mica tube is a hollow cylindrical insulation sleeve made from natural Muscovite or Phlogopite mica, wound and bonded with heat-resistant resin. Because mica retains its dielectric strength and structural integrity at temperatures where fiberglass, silicone and phenolic decompose, mica tubes are the standard insulation material for high-voltage equipment operating in high-temperature environments — welding machines, industrial furnaces, resistance heaters and transformer cores.
As an experienced mica tube manufacturer in China, Kaxite Sealing produces high-temperature mica tubing in four cross-sections — square, round, oval and rectangular — with wall thicknesses from 0.5 mm to 10 mm, standard 1000 mm lengths, and cut-to-size options. Related mica products: Mica Sheets, Mica Tapes and Mica Gaskets.
How mica tubes compare against alternative high-temperature tubing
Mica tubes maintain dielectric strength at temperatures where PVC, nylon and silicone tubing melt or decompose. This is why mica is the only practical insulating material for welding torches, furnace heating elements and high-voltage transformer bushings.
| Property | Mica Tube | Silicone Fiberglass | Ceramic Tube |
|---|---|---|---|
| Max Temperature | 1000°C | ~200°C | ~1200°C |
| Machinability | Good — cut & drill | Flexible | Brittle |
| Dielectric Strength | 15 – 25 kV/mm | 10 – 15 kV/mm | 10 – 20 kV/mm |
| Thermal Shock | Excellent | Good | Poor |
| Water Absorption | < 0.1% | Moderate | Low |
| Best For | Welding · Furnace · Transformer | General wire sleeves | Ultra-high temp only |
Custom sizes and cross-sections available on request. Review our Our Quality page for tolerance specifications, or send us your inquiry for a fast quotation.
Wherever high-temperature electrical insulation is required
Torch & cable insulation
Heating element supports
Bushing & winding insulation
Element sleeves & leads
Winding & slot insulation
Furnace sensor protection
Furnace electrode insulation
Engine sensor insulation
Round is the standard for wire and cable insulation, providing uniform dielectric coverage. Square and rectangular are space-efficient for bus bars and slot insulation where a tight fit matters. Oval is used for flat-space installations where a round tube would not fit. Contact us with your installation detail for a recommendation.
Muscovite mica tubes are rated up to 500°C with the best dielectric strength, ideal for motor and transformer insulation. Phlogopite mica tubes are rated up to 1000°C, preferred for welding torches, industrial furnaces and glass plant electrode insulation.
Yes. We machine to any outer diameter from 3 mm to 100 mm, wall thickness from 0.5 mm to 10 mm, and cut to any length. Standard stock lengths are 1000 mm. Please send your inquiry with dimensions for a fast quotation.
No. Mica tube has a water absorption rate below 0.1%, keeping its dielectric strength stable in humid or wet environments. This makes it far more reliable than fiberglass or phenolic tubing in tropical or marine installations.
Yes. Every shipment includes Mill Test Certificate, dimensional inspection record and material composition report. RoHS and REACH documentation are available on request. See our Our Certificate page.
MOQ is 10 pcs for standard sizes. Lead time is 7-15 days after order confirmation. Payment terms are T/T or L/C. Free samples are available — you only cover the courier cost. Contact Us to discuss.
Send us your OD, ID, wall thickness and cut length — we machine mica tube to any dimension with tolerance ±0.2 mm. No extra tooling charge for standard material.
Get Custom QuoteVerify material, cross-section, wall thickness and dielectric strength against your own spec before placing a bulk order. Both Muscovite and Phlogopite samples available.
Contact Us NowMica tube (also called mica insulation tube or micanite tube) is a rigid hollow tube made from mica paper or splitting mica bonded with resin, formed by roll-winding and shaped into round, square, oval or rectangular profiles. It operates from 130 °C to 1000 °C, giving it advantages over industrial ceramic tubes: excellent electrical insulation, resistance to rapid temperature change, non-friable structure, flexible sizing, easy delivery and low cost. It is used as an insulation sleeve in hair dryers, air blowers, hot guns and many other electrical devices and heating elements, and is a standard choice for electric motors, electrical appliances and electric smelting furnaces where the continuous operating temperature does not exceed 1000 °C.
