High-Purity Boron Nitride Tube Excellent Insulation for High-Voltage Applications

Boron Nitride Tube stands as a premium ceramic component engineered for high-temperature, high-purity industrial applications, with customizable specifications to meet diverse sector needs—from metallurgy and electronics to aerospace and semiconductor manufacturing. Crafted from high-purity hexagonal boron nitride (h-BN) powder via advanced hot pressing and sintering technology, this high-purity boron nitride tube delivers exceptional thermal stability, electrical insulation, and chemical inertness, outperforming traditional ceramic tubes (alumina, zirconia) in harsh operating environments. Whether serving as a crucible sleeve for metal melting, a heat transfer tube in semiconductor annealing, or a protective sleeve for high-voltage electrodes, our custom boron nitride tube combines material excellence with tailored design to solve critical industrial pain points.

At the core of our Boron Nitride Tube is its unmatched high-temperature resistance—a defining advantage for extreme-heat applications. It maintains structural integrity from -270℃ (cryogenic environments) to 2000℃ in inert atmospheres, with a short-term tolerance of up to 2200℃. Unlike alumina tubes that soften above 1700℃, our high-temperature boron nitride tube avoids deformation or cracking during prolonged high-heat operations, such as vacuum induction melting of rare metals (titanium, tungsten) or glass fiber drawing. This thermal stability is paired with excellent thermal conductivity (30-40 W/(m·K) at room temperature), enabling uniform heat distribution that prevents hot spots—critical for precision processes like semiconductor wafer annealing, where temperature variations of ±5℃ can ruin batches.

Electrical insulation performance sets our Boron Nitride Tube apart in high-voltage and electronics applications. With a volume resistivity of ≥10¹⁶ Ω·cm at 25℃ and ≥10¹⁴ Ω·cm even at 1000℃, it acts as a reliable insulator for high-voltage electrode sleeves in plasma cutting or electrostatic precipitators. Unlike quartz tubes that suffer dielectric breakdown under high voltage, our insulating boron nitride tube maintains stable insulation performance, reducing equipment downtime caused by electrical failures. Its low dielectric constant (4.0-4.5 at 1 MHz) also minimizes signal interference, making it suitable for use in high-frequency electronic components like microwave tube sleeves.

Chemical inertness is another key attribute of our Boron Nitride Tube. It is resistant to most corrosive chemicals, including strong acids (hydrochloric, sulfuric), alkalis, and molten metals (aluminum, copper, iron) at high temperatures. This corrosion-resistant boron nitride tube does not react with molten materials, avoiding contamination—a critical requirement for semiconductor and pharmaceutical applications where purity is paramount. Our customizable boron nitride tube service addresses the unique needs of diverse industries, with flexible specifications to match any application. Outer diameters range from 5mm to 200mm, inner diameters from 3mm to 180mm, and lengths from 10mm to 1000mm—with custom sizes available via modular manufacturing. Wall thickness options (0.5mm-20mm) cater to different pressure and load requirements: thin-walled tubes (0.5-2mm) for lightweight electronics applications, and thick-walled tubes (10-20mm) for heavy-duty metallurgical use. Surface finishing options include polished (Ra ≤0.8μm) for low-friction applications and sandblasted for enhanced adhesion in coating processes. We also offer custom drilling, threading, and flanging to integrate seamlessly with existing equipment.

Boron Nitride Tube delivers tangible business value. Its long service life (2-3 times that of traditional ceramic tubes) reduces replacement frequency and maintenance costs by 40%. Compatibility with automated production lines cuts labor costs, while custom designs eliminate the need for expensive equipment modifications. We support customers with value-added services: material selection consultation to match application requirements (e.g., high-purity grades for semiconductors, cost-effective grades for general industry), free sample testing, and fast lead times (7-10 days for standard sizes, 15-20 days for custom designs).

Backed by decades of boron nitride material expertise and a global supply chain, we are a trusted partner for industrial manufacturers worldwide. Our R&D team continuously advances product performance, with recent breakthroughs including a reinforced boron nitride tube (15% higher flexural strength) and a low-cost grade for general industrial use without compromising key properties. Whether you need standard sizes or fully custom boron nitride tubes, we deliver the reliability, performance, and value to elevate your operations. Contact us today to discuss your requirements, request samples, or obtain technical datasheets—experience the difference of purpose-built boron nitride solutions.

  
To ensure customer satisfaction, we offer comprehensive support

After-Sales Policy: 1-year warranty for regular products. For quality issues during warranty, we respond within 48 hours and complete maintenance/replacement within 7 days.
Featured Services: Customization according to your requirements ad drawings(size: 5-500mm diameter; shape: circular/irregular; porosity:30%-70%) with free design solutions. 
New customers get 1-3 samples (15-30-day production cycle). Professional teams provide one-on-one installation guidance and free operation training.

  
Contact Information

Consultation Hotline: 0518-81060611 (8:00-18:00 workdays); Online Consultation: www.cnhighborn.com; Address: 919-923 Bldg.A, Dongshengmingdu Plaza, No.21 Chaoyang East Rd, Lianyungang, Jiangsu.



Technical Specifications