Main Component:
High-purity hexagonal Boron Nitride (h-BN), total BN content ≥99.5%, oxygen content ＜0.4%, carbon content ＜0.05%, hot-pressed fully dense sintered body with ultra-low impurity content, no harmful precipitation under strong oxidizing and high-temperature conditions.
Service Temperature :
Max continuous working temperature up to 900℃ under oxidizing atmosphere; can be long-term stably used above 2200℃ under vacuum and inert atmosphere, excellent high-temperature stability for ozone generator and water purification equipment.
Insulation / Sealing Performance:
Volume resistivity at room temperature ＞10¹² Ω·m, breakdown voltage 2.5–4.0 ×10⁶ kV/m, ultra-high electrical insulation to prevent high-voltage short circuit and electric leakage of ozone electrodes; high flatness precision machining realizes micron-level sealing precision, stable sealing performance under high & low temperature alternating conditions.
Product Details
Hot pressed boron nitride ceramics feature ultra-high insulation performance, excellent chemical inertness, outstanding thermal shock resistance, and boron nitride will not react with ozone, most acids and alkalis. It can withstand wide temperature ranges and high voltage working conditions, with density ranging from 1.9–2.2 g/cm³, room temperature bending strength ≥35MPa, compressive strength ≥200MPa, and a sublimation temperature of 2700℃.
A remarkable feature of hot pressed boron nitride ceramics is its superior electrical insulation property, with room temperature volume resistivity exceeding 10¹² Ω·m and breakdown voltage up to 2.5–4.0×10⁶ kV/m, which can effectively avoid high-voltage leakage and short-circuit faults of ozone equipment. It has a low thermal expansion coefficient (6.5–7.5×10⁻⁶/℃), delivering excellent thermal dimensional stability, paired with good self-lubricating property for easy assembly and disassembly. It is chemically stable against strong oxidizing media like ozone, strong acids and strong alkalis, and is non-toxic and pollution-free.
Hot pressed boron nitride is a mature commercial structural ceramic material with stable forming performance, which can be precisely machined into various customized ring, gasket, sleeve and special-shaped structures according to customer drawings.
A core advantage of hot pressed boron nitride ceramic rings lies in its high-purity dense hot-pressed structure, with total BN content ≥99.5%, extremely low oxygen and carbon impurity content. It will not precipitate harmful substances under high-temperature and strong oxidation environments, making it the ideal insulating and sealing material for ozone generators, water purification and high-voltage electrical equipment. Many manufacturers now choose boron nitride ceramic parts to replace traditional insulating materials such as alumina, mica and insulating plastic, to extend equipment service life and improve operational safety.
Hexagonal hot pressed boron nitride (h-BN) is commonly known as "white graphite", featuring a layered crystal structure. It is widely used in ozone disinfection equipment, high-temperature vacuum devices, semiconductor fixtures and electrical insulating components.
High & low temperature resistance
Excellent electrical insulation
Ozone & acid-alkali corrosion resistance
Self-lubricating & easy assembly
Stable dimensional precision
Non-toxic food-grade safe material
1.Long service life: High-density hot-pressed compact structure greatly extends the service life, 3–8 times longer than ordinary insulating ceramic parts
2.High thermal conductivity: Dense low-porosity body ensures stable heat conduction, avoids local heat accumulation of high-voltage electrodes
3.High-purity eco-friendly new material: No heavy metal precipitation, compliant with FDA and EU food safety standards, no pollution to water and gas media
4.Excellent corrosion resistance: Far superior to ordinary insulating plastics and low-purity alumina ceramics against ozone oxidation
5.Stable oxidation resistance: Special hot-pressing process effectively improves high-temperature oxidation performance, maintaining stable insulation and sealing performance in long-term continuous operation
6.High mechanical strength: Compact internal structure brings excellent compression and impact resistance
7.Energy-saving & environmentally friendly: Stable physical and chemical properties, no aging, no volatile harmful substances, suitable for drinking water and food disinfection equipment
By taking advantage of its ultra-high insulation, ozone corrosion resistance and high-temperature stability, boron nitride rings are widely used as insulating sealing parts for different devices, accounting for more than 65% of the global consumption of boron nitride insulating components.
It is also widely applied in high-temperature vacuum furnace insulation fixtures, semiconductor processing positioning parts, high-voltage power electrical insulating gaskets, molten metal heat-resistant accessories and laboratory anti-corrosion insulating components.
We can design and produce various shapes and sizes of boron nitride ceramic ring, please feel free to contact us if you have any question or inquiry. We will be glad to quote and service you.
| Item | Unit | Index | |
| Thermal Conductivity (RT) | W/m·k | 45-50 | |
| Thermal expansivity (25-700℃) | 10⁻⁶/℃ | 6.5-7.5 | |
| Resistivity (RT) | Ω·m | >10¹² | |
| Puncture voltage | 10⁶ kV·m | 2.5-4.0 | |
| Mohs' hardness | - | 2 | |
| Dielectric constant (Σ) | - | 3.8-4.3 | |
| Bending strength (RT) | mpa | >35 | |
| Compression strength (RT) | mpa | >200 | |
| Density | g/cm³ | 1.9-2.2 | |
| Chemical Composition | B+N | % | 99.5 |
| Oxygen Content | % | <0.4 | |
| Carbon Content | % | <0.02 | |
| Working Environment Temperature | Oxidizing Atmosphere | ℃ | 850 |
| Vacuum | ℃ | 1800 | |
| Inertia | ℃ | 2300 | |
Pyrolytic Boron Nitride
| Item | Unit | Index | |
| Lattice Constant | μm | a: 2.504×10⁻¹⁰; c: 6.692×10⁻¹⁰ | |
| Apparent Density | g/cm³ | 2.10–2.15 (Plate); 2.15–2.19 (Crucible) | |
| Helium Transmittance | cm³/s | 1×10⁻¹⁰ | |
| Micro Hardness (Knoop) (abflat) | N/mm² | 691.88 | |
| Volume Resistivity | Ω·cm | 3.11×10¹¹ | |
| Tensile Strength (Force || "C") | N/mm² | 153.86 | |
| Bending Strength | (Force || "C") | N/mm² | 243.63 |
| (Force ⊥ "C") | N/mm² | 197.76 | |
| Elasticity Modulus | N/mm² | 235690 | |
| Thermal Conductivity | W/m·k | "a" direction "c" direction | |
| 200℃ | W/m·k | 60 2.60 | |
| 900℃ | W/m·k | 43.70 2.80 | |
| Dielectric Strength (RT) | KV/mm | 56 | |
Development History
Patents and certification
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