Vulcanized Fiber Tube – High Strength Electrical Insulation

Introduction
Vulcanized fiber tube is a time-tested insulating material widely used in the electrical and electronic industries. Manufactured from multiple layers of cotton-based paper and treated with zinc chloride to produce a dense, hard, and non-conductive material, it offers an outstanding balance of mechanical strength, electrical insulation, and thermal resistance. This makes it a popular choice for various high-voltage and high-temperature applications.

What Is Vulcanized Fiber Tube?

Vulcanized fiber tube is a rigid cylindrical insulating component made by winding and compressing treated paper layers into tubular form. Through a vulcanization process (without sulfur), the paper becomes chemically bonded and hardened, resulting in a robust material that resists cracking, absorbs impact, and withstands electric stress.

Key Properties:

  • Excellent dielectric strength (typically > 10kV/mm)
  • High mechanical strength-to-weight ratio
  • Thermal resistance up to 105°C (Class A insulation)
  • Lightweight and machinable
  • Environmentally friendly (non-toxic, biodegradable)

Main Applications

Thanks to its excellent insulation and structural performance, vulcanized fiber tubes are used in:

✅ Electric motors – slot liners, phase insulation, and spacers
✅ Transformers – internal winding insulation and support structures
✅ Circuit breakers & switchgear – arc-extinguishing tubes and barriers
✅ Battery systems – insulation between cells or terminals
✅ Power distribution boxes – sleeves and insulating barriers
✅ Electronic devices – protective sleeves for wires and components

Advantages Over Other Insulating Tubes

Compared with epoxy fiberglass or PVC insulating tubes, vulcanized fiber tube offers:

FeatureVulcanized Fiber TubeEpoxy Glass TubePVC Tube
Electrical Insulation✅ Excellent✅ Excellent⚠️ Limited
Mechanical Strength✅ High✅ Very High⚠️ Low
Machinability✅ Easy⚠️ Moderate✅ Easy
Eco-Friendliness✅ Biodegradable❌ Non-degradable❌ Non-degradable
Cost✅ Affordable❌ Expensive✅ Low

Why Choose Simhoo’s Vulcanized Fiber Tube?

At Simhoo New Material Co., Ltd., we specialize in the export of high-performance vulcanized fiber insulation materials. Our tubes are produced with consistent thickness, smooth inner/outer walls, and customized lengths and diameters to fit your equipment and design needs.

📌 Available Sizes:

  • Inner diameters from 5mm to 120mm
  • Wall thickness from 0.5mm to 5mm
  • Custom lengths up to 1200mm

📌 Color Options:

  • Red / Brown / Grey / Custom on request