Boron Nitride Plates | High-Temperature Insulation and Molten Metal Handling
ADCERAX is a China-based manufacturer of hot-pressed hexagonal boron nitride (h-BN) plates, sheets, blocks and blanks. We machine BN to your drawing or old part for high-temperature and vacuum furnace insulation, molten-metal contact parts, PVD and thermal fixtures, and electrical isolation components — with controllable density, thickness and dimensional accuracy for stable performance in demanding environments.
We supply both standard and custom-machined BN parts based on drawings or samples, with flexible small-batch and project-based production. Each part is reviewed around temperature, atmosphere, contact media and size before quoting, so the plate fits your process instead of a generic stock size.
What is a Boron Nitride Plate?
Boron nitride plate is a flat component made primarily from hot-pressed hexagonal boron nitride (h-BN). This ceramic is often described as “white graphite” because its layered structure gives it high thermal conductivity in-plane while remaining an excellent electrical insulator.
Hot-pressed h-BN can be machined with conventional carbide tools into plates, sheets, blocks, and blanks. These parts keep their mechanical stability and insulation function at elevated temperatures in vacuum, inert gas, or controlled atmospheres.
Boron Nitride Plate Properties
Boron nitride (BN) plates offer high thermal stability, chemical inertness, and strong electrical insulation performance. Their layered crystal structure supports effective thermal spreading, low thermal expansion, and reliable non-wetting behavior when in contact with molten metals.
| Property | Unit | Pyrolytic Boron Nitride (PBN) | Hot-Pressed Boron Nitride (HPBN) | Description / Application Focus |
|---|---|---|---|---|
| Purity | % | 99.99 | 99.5 | High-purity BN ensures chemical stability and oxidation resistance under extreme temperatures. |
| Density | g/cm³ | 2.15–2.19 | 1.96–2.00 | Low density with high structural integrity; ideal for lightweight thermal and vacuum components. |
| Thermal Conductivity | W/m·K | 60 (A-direction) | 55 | Excellent heat transfer for high-temperature insulation and thermal management applications. |
| Dielectric Strength | kV/mm | 55 | 76 | Superior electrical insulation and high dielectric constant for electronic and vacuum environments. |
| Maximum Working Temperature | °C | 1000 (air) / 2300 (vacuum) | 900 (air) / 1850 (vacuum) | Maintains mechanical strength and stability in both oxidizing and vacuum atmospheres. |
| Bending Strength | MPa | 173 (A-direction) | 310 | Excellent mechanical reliability and resistance to cracking after repeated thermal cycling. |
| Thermal Expansion Coefficient | /°C | 6×10⁻⁷ | 1.8×10⁻⁶ | Low thermal expansion provides outstanding dimensional stability and thermal shock resistance. |
| Compressive Strength | MPa | 154 (A-direction) | 120 | High compressive strength supports long service life in demanding structural applications. |
Key values vary by BN grade (HPBN vs PBN) and working atmosphere; contact ADCERAX for grade selection.
China Boron Nitride Plate Products
ADCERAX supplies hot-pressed boron nitride plates and sheets in multiple grades, thickness options, and machining sizes. Standard BN plate formats are available, and custom dimensions can be produced according to drawings or samples.
High purity bn plates are used as high-temperature insulation panels, non-wetting contact surfaces, furnace fixture components, and thermal barrier liners in molten metal processing, vacuum systems, and precision heating equipment.
Hexagonal BN sheets provide clean-release surfaces, thermal insulation, and stable performance under repeated heating cycles, used in high-temperature furnace panels, diffusion barriers, and non-wetting contact layers.
BN insulation gaskets deliver electrical insulation, thermal resistance, and low-friction contact surfaces, suitable for sealing, spacing, and heat-isolating interfaces in thermal processing equipment and vacuum chambers.
💡 Stable at High Heat. Precise in Every Detail — That’s ADCERAX BN Plates.
When conventional ceramic plates deform, stick to molten metals, or fail under thermal cycling, ADCERAX boron nitride plates remain dimensionally reliable, non-wetting, and easy to machine — helping you reduce downtime, improve fixture lifespan, and maintain consistent process quality.
Boron Nitride (BN) Plate Applications
Boron nitride (BN) plates are used across high-temperature, vacuum and molten-metal equipment. Common roles are grouped by industry below — the right grade and thickness depend on your temperature, atmosphere and mounting, so send a drawing or old part for a fit check.
Industrial — Thermal Furnaces & Vacuum Heat-Treatment
Hot-zone insulation panels, spacers, setters and support surfaces in vacuum, sintering, diffusion and heat-treatment furnaces.
- Why BN plate here:
- Electrical and thermal insulation that stays stable at high temperature
- Low thermal expansion and good thermal-shock resistance through repeated cycling
- CNC-machined to fit your existing hot-zone geometry
Electronic — Power Electronics & Electrical Isolation
Insulation layers, mounting bases and dielectric separators in power electronics and PVD/evaporation fixtures.
- Why BN plate here:
- Electrical insulation with moderate thermal conductivity
- Machinable features — slots, tapped holes, recesses, cavities
- Stable, flat thin-plate installation
Metallurgy — Molten Metal Handling & Casting (Al, Cu, Mg)
Contact and isolation surfaces, break rings, spacers and launder parts in non-ferrous melt handling and casting.
- Why BN plate here:
- Low wettability keeps metal flow clean and reduces build-up
- Chemically inert to many molten metals and salts
- Machined to your contact geometry and thickness
Laboratory — Lab & Materials-Research Systems
Small-batch, non-standard fixtures, insulators and setters in lab furnaces, vacuum systems and materials-testing rigs.
- Why BN plate here:
- Clean, non-contaminating surface for sensitive processes
- Machinable into custom shapes, holes and slots from a drawing or old part
- Reliable insulation in vacuum and inert atmospheres
Custom Boron Nitride (BN) Plate Manufacturer
ADCERAX is a China-based boron nitride plate manufacturer, producing standard and custom-machined BN plates, sheets, blocks and blanks from your drawing or sample. We support multiple grades, thickness ranges and precise sizing with stable batch consistency. Feasibility and lead time are confirmed per order after engineering review.
Customization Options
Extra-large / Extra-small diameters, non-standard thicknesses, and ultra-long / ultra-short lengths.
Provide higher - level dimensional accuracy and concentricity control than the standard.
Flanges, steps, threads, drilling holes, grooves, etc.
Adjust the material according to the application requirements.
Polish and grind the surface to achieve a specific surface roughness.
Customization Process
Send us your drawing, CAD file, or physical sample with material grade, dimensions, tolerances, and quantity. Our engineers will evaluate the design and provide a detailed quotation with lead time and pricing.
Once the quote is approved, we proceed with sample prototyping (1–50 pcs) if needed, for testing and validation.
After sample approval or direct confirmation, we begin batch manufacturing using CNC machining, sintering, and polishing. All parts undergo dimensional checks, material purity testing, and surface finish inspection.
Finished products are securely packed and shipped via DHL/FedEx/UPS or your preferred method. We support global delivery with full documentation.
ADCERAX —Advanced Boron Nitride Plate Manufacturer
We manufacture hot-pressed boron nitride plates in China — formed, machined and inspected within our own process chain — so you receive a BN plate that performs consistently and can be reordered to the same spec.
Quality you can rely on
- Every batch checked for density, purity, microstructure uniformity and moisture
- Dimensional inspection before shipment for thickness, flatness and tolerance
- Stable hot-pressing for consistent insulation and lower failure risk under thermal cycling
- Repeat orders held to the same verified spec
| Capability at a glance | |||
|---|---|---|---|
| Material | Hot-pressed h-BN, multiple grades (HPBN / HBN) | ||
| Forms | Plate · sheet · block · blank + machined parts | ||
| Machining | CNC milling, drilling, slotting, stepping, profiling, lapping | ||
| Tolerance / flatness | Typical ±0.05 mm; tighter on request | ||
| Use temperature | ~900 °C air; ~1800–2100 °C vacuum/inert (typical, grade-dependent) | ||
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Inspection
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Export packing
Frequently Asked Questions About Boron Nitride Plate
No. A cubic boron nitride (cBN) plate belongs to the superhard abrasive family used in grinding wheels and cutting tools. This page is about hot-pressed hexagonal boron nitride (h-BN) plate used for high-temperature insulation, vacuum-furnace and PVD fixtures and molten-metal contact - a different material and supply chain from cBN abrasives. Pyrolytic boron nitride (PBN) is a further separate process route, mentioned only for comparison.
For an accurate quote, share the form (plate, sheet, block or blank), target BN grade, length, width and thickness, machined features (holes, slots, chamfers, steps), flatness and tolerance, operating temperature and atmosphere (air vs inert/vacuum), any molten-metal or salt contact, mechanical load, and quantity - a drawing or old-part photo is ideal. ADCERAX then reviews feasibility and prepares a quotation with lead time confirmed per order rather than a fixed stock or shipping promise.
Hot-pressed h-BN has a naturally low-wetting, chemically inert surface toward many molten non-ferrous metals such as aluminium, which can help reduce metal build-up and adhesion on fixtures and contact plates. Actual behaviour depends on the metal or salt, temperature, contact time and any flow or erosion, so suitability is confirmed per application rather than assumed for all molten metals.
Compared with alumina, h-BN is generally more machinable and offers a low-wetting, electrically insulating surface, while alumina can offer higher mechanical strength; compared with graphite, h-BN is an electrical insulator and is non-wetting to many melts, whereas graphite is conductive. The right material depends on your temperature, atmosphere, electrical and load requirements, so the choice is confirmed against your duty rather than stated as a fixed ranking.
Yes. BN plates can be CNC-machined into stepped blocks, rings, bushings, channels, hole patterns or fixture interfaces from a drawing or sample. The material supports drilling, milling, slotting and surface trimming with stable accuracy — suitable for furnace panels, thermal-barrier parts and non-wetting contact components.
Hot-pressed BN (h-BN)
Sintered from h-BN powder — the machinable choice for furnace panels, fixtures, mounting holes and molten-metal contact parts, with stable density and good mechanical integrity.
Pyrolytic BN (PBN)
Grown by CVD for ultra-high purity, very low porosity and smooth surfaces — used in semiconductor, crystal-growth and evaporation-source environments.
How to choose: pick hot-pressed BN for machinable structural and molten-contact parts; pick PBN for contamination-sensitive, ultra-high-purity uses. ADCERAX focuses on hot-pressed BN plates and sheets for industrial applications.
Yes. ADCERAX is a boron nitride plate manufacturer in China and ships BN plate orders worldwide, including the US, Europe, Japan and South Korea. Material grade, machining feasibility, thickness and drawings are reviewed by our engineers before ordering, and every shipment includes export-grade packing, dimensional inspection and the required commercial documents for smooth customs clearance.
Both are advanced ceramics, but they suit different jobs.
Hot-pressed h-BN (hexagonal boron nitride)
Layered, graphite-like structure — easily machinable, chemically inert, non-wetting to many molten metals, thermally stable and electrically insulating.
Fits: aluminium casting and contact parts, crucible and diffusion fixtures, vacuum tooling, thermal-insulation boards, furnace panels.
Si₃N₄ (silicon nitride)
High-strength, tough, wear-resistant structural ceramic with strong thermal-shock and mechanical-load resistance.
Fits: bearings, wear parts, spacers, nozzles, high-load assemblies.
How to choose: pick h-BN for machinability, molten-metal contact, electrical insulation or high-temperature non-wetting; pick Si₃N₄ for mechanical strength, impact resistance and high-load structural stability.
Boron Nitride Plate — What to Send for a Quote
Tell us as much as you can; a drawing or an old-part photo is enough to start.
- Form & grade: plate / sheet / block / blank; any known BN grade
- Dimensions: length × width × thickness (mm)
- Machined features: holes, slots, chamfers, steps, threads
- Working temperature: continuous and peak (°C)
- Contact media (if any): molten metal or salt type, contact time, flow
- Role in the equipment: insulation / fixture / setter / masking / molten-metal contact
- Quantity: sample qty + expected batch / annual volume
- Drawing or old-part photo (upload)
We review each part around temperature, atmosphere, contact media and size before quoting, so the plate fits your process.
*Our team will answer your inquiries within 24 hours.
*Your information will be kept strictly confidential.
info@adcerax.com
Tel:+86-0731-84428843
WhatsApp:+86 19311583352
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