High-Purity Hexagonal Boron Nitride Powder (hBN) – 1.7–38 μm
Hexagonal Boron Nitride Powder (hBN)
ITOWU supplies high-purity hexagonal boron nitride powder in particle-size grades ranging from ultrafine to ultra-coarse. The BN-A to BN-ES series covers D50 values from 1.7 μm to 38 μm for use in thermally conductive and electrically insulating composites, lubricants, coatings, ceramic processing, and other industrial applications.
Grades: BN-A to BN-ES
D50: 1.7–38 μm
Purity: ≥99.0%
Need help selecting a grade?
Tell us your application, target particle size, processing system, and estimated quantity. We can recommend a suitable grade for initial evaluation.
Choose the Right Boron Nitride Powder Grade
Particle size affects surface coverage, packing behavior, processing characteristics, and thermal-network formation. The table below provides a starting point for comparing BN-A to BN-ES by particle size, surface area, and typical application direction.
| Grade | Classification | D50 | Purity (B+N) | BET Surface Area | Typical Application Direction |
|---|---|---|---|---|---|
| BN-A | Ultrafine | 1.7 μm | ≥99.0% | 30.30 m²/g | Ultra-thin TIMs, thermal grease, IC underfill, high-lubricity coatings, precision dielectric films |
| BN-B | Fine | 4.5 μm | ≥99.0% | 11.50 m²/g | Fine-particle formulations and multimodal filler systems |
| BN-C | Medium | 9.5 μm | ≥99.0% | 9.20 m²/g | General release agents, ceramic processing, composite fillers, coating systems |
| BN-D | Coarse | 16.0 μm | ≥99.0% | 3.00 m²/g | Thermal interface materials, polymer fillers, solid lubricants, powder metallurgy |
| BN-E | Extra-Coarse | 30.0 μm | ≥99.0% | 2.00 m²/g | Thermal pads, silicone rubber, epoxy fillers, refractory coatings |
| BN-ES | Ultra-Coarse | 38.0 μm | ≥99.0% | 1.50 m²/g | High-loading thermal fillers, heat-spreader ceramics, high-temperature composites |
Applications & Material Characteristics
Hexagonal boron nitride (hBN) combines thermal conductivity, electrical insulation, lubricity, chemical resistance, and high-temperature stability. Its layered crystal structure supports low-friction behavior.
Thermal Management Materials
Thermal interface materials, thermal grease, thermal pads, silicone rubber, epoxy fillers, and electrically insulating thermal composites.
Coatings & Release Systems
Mold release agents, refractory coatings, functional coatings, precision dielectric coatings, and high-lubricity coating systems.
Lubricants & Wear Reduction
Solid lubricants, industrial lubrication coatings, and low-friction formulations requiring consistent particle coverage.
Ceramics & Composite Processing
Ceramic processing, powder metallurgy, heat-spreader ceramics, high-temperature composites, and engineered material systems.
Technical Specifications & Quality Control
| Parameter | BN-A | BN-B | BN-C | BN-D | BN-E | BN-ES |
|---|---|---|---|---|---|---|
| B2O3 | ≤0.5% | ≤0.5% | ≤0.5% | ≤0.5% | ≤0.5% | ≤0.5% |
| Total Oxygen | ≤0.5% | ≤0.4% | ≤0.3% | ≤0.3% | ≤0.2% | ≤0.2% |
| Carbon | <0.1% | <0.1% | <0.1% | <0.1% | <0.1% | <0.1% |
| Moisture | ≤0.5% | ≤0.5% | ≤0.3% | ≤0.3% | ≤0.2% | ≤0.2% |
| Fe / Cr / Ni / Cu / Mg | Each <10 ppm | Each <10 ppm | Each <10 ppm | Each <10 ppm | Each <10 ppm | Each <10 ppm |
Note:Final material selection and acceptance should be based on the agreed grade specification and relevant batch documentation.
Company Credentials & Technical Documents
ITOWU provides company qualification documents and product technical data to support supplier evaluation, material qualification, and international purchasing requirements.
Company Credentials
ISO 9001Quality Management System Certificate
Dun & BradstreetBusiness Verification / D-U-N-S Documentation
Certificate of OriginExport Documentation
Business LicenseCompany Registration Documentation
Product Technical Documents
Technical Product Overview
Additional documents available on request:
TDS· SDS / MSDS · Particle Size Distribution (PSD) Report · Certificate of Analysis (COA)
Manufacturing & Batch Control
Production covers calcination, powder processing, particle-size classification, and batch inspection.
Calcination & Powder Processing
Calcination and powder processing control crystal development and maintain consistent hBN powder quality.
Particle-Size Classification
Milling and classification control particle size within the defined BN-A to BN-ES grade ranges.
Production CapacityMonthly output is approximately 40 tons, with annual throughput up to 500 tons for evaluation samples, pilot trials, and volume supply.
Packaging & Global Delivery
Boron nitride powder is packed in a sealed polyethylene liner and aluminum foil composite bag to help limit moisture absorption and contamination.
Units are packed in reinforced export cartons for international transport. Packaging and shipping arrangements can be confirmed according to order quantity and destination.
Request a Quote for Boron Nitride Powder
Contact us for pricing, samples, technical documentation, or grade selection.
Frequently Asked Questions About Boron Nitride Powder
What boron nitride powder grades are available?
ITOWU offers boron nitride powder in multiple particle-size grades from BN-A to BN-ES.
The available series covers D50 particle sizes from approximately 1.7 μm to 38 μm,
allowing users to select a grade according to processing requirements and application performance.
How do I choose the right boron nitride powder particle size?
Particle size should be selected according to the application, formulation, filler loading,
viscosity, coating thickness, and target performance. Fine powders provide higher surface area
and are suitable for fine dispersion and thin coatings, while larger particles can be useful
for higher-loading systems and thermal filler formulations.
If you are unsure which grade to start with, provide your application and processing requirements
for grade selection support.
What applications is boron nitride powder used for?
Boron nitride powder is commonly used in:
- Thermal interface materials and thermally conductive composites
- Silicone rubber, epoxy, and polymer fillers
- Release coatings and mold release systems
- Solid lubricant and low-friction formulations
- Ceramic and composite processing
- Electrically insulating thermal-management materials
Can boron nitride powder be used as a thermal filler?
Yes. Boron nitride powder is widely used as an electrically insulating thermal filler
in silicone, epoxy, adhesives, thermal pads, thermal grease, and other polymer systems.
Particle size, particle distribution, filler loading, resin system, and processing conditions
all influence the final thermal and rheological performance.
Can I request a boron nitride powder sample for evaluation?
Evaluation samples can be discussed according to the required grade, application, and project requirements.
Providing your target particle size, application, estimated quantity, and testing purpose helps us recommend
an appropriate starting grade.
What technical documents are available for boron nitride powder?
Technical documentation can include:
- Technical Data Sheet (TDS)
- Safety Data Sheet (SDS / MSDS)
- Certificate of Analysis (COA)
- Particle Size Distribution (PSD)
- Grade and particle-size information
How can I get a price for boron nitride powder?
Boron nitride powder pricing depends on the selected grade, particle size, quantity,
technical requirements, packaging, and delivery destination. For an accurate quotation,
please provide the required grade or target D50, estimated quantity, application,
and destination country or port.
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