Boron Nitride Ring Description
Hot Pressed Boron Nitride (HPBN) Break Ring is a precision ceramic component made from high-purity hexagonal boron nitride powder, formed through a vacuum hot-pressing process. These break rings are primarily used in high-temperature metal casting and continuous casting operations, particularly for non-ferrous metals like aluminum, magnesium, and their alloys.
Boron Nitride Break Ring (H-BN Break Ring) Specifications
Grade
|
BN99
(Grade AX05)
|
BN-BO
(Grade A)
|
BNCB
(Grade HP)
|
BNSIO
(M&M26)
|
ZSBN
|
Composition
|
hBN > 99.5%
|
hBN > 98%
|
hBN > 90%
|
hBN 40%, SiO2 60% (M)
hBN 60%, SiO2 40% (M26)
|
hBN > 45%
ZrO2 < 45%
Borosilicate < 10%
|
Binder Type
|
Self-Bonded
|
B2O3
|
Calcium Borate
|
SiO2
|
Borosilicate glass
|
Color
|
white
|
white
|
white
|
white
|
gray
|
Density
g/cm3
|
1.9
|
2.0
|
2.0
|
2.1-2.3
|
2.9
|
Compressive Strength
MPa, 25℃
|
25
|
143-186
|
96
|
289-316
|
219-254
|
Hardness (Knoop)
Kg/mm2
|
4
|
20
|
16
|
-
|
100
|
Shape
|
Rod
Plate/Sheet
Tube
Crucible
Custom part
|
Rod
Custom part
|
Custom part
|
Custom part
|
Nozzle
Custom part
|
*The above information is based on theoretical values. For specific customization requirements, please feel free to contact us.
Prototyping service also available for other ceramics material
Prototyping service also available for other ceramics material
Alumina(99~99.7) Silicon Nitride
Pyrolytic boron nitride Boron Carbide
Silicon Carbide (98% 99.5%) Zirconia
Boron Nitride Break Ring (H-BN Break Ring) Applications
Boron Nitride Break Rings are specialized components designed for demanding mechanical and electrical environments. Their key applications include:
-
High-Temperature Mechanical Seals and Supports
Used as durable, wear-resistant rings in mechanical seals and bearing assemblies, especially in high-temperature and corrosive environments.
-
Electrical Insulation Rings
Serve as excellent electrical insulators in high-voltage equipment, providing reliable dielectric strength and thermal stability.
-
Vacuum and High-Temperature Equipment Components
Ideal for use in vacuum systems and high-temperature devices where low outgassing, chemical inertness, and thermal resistance are critical.
-
Corrosion-Resistant and Wear-Resistant Parts
Their chemical stability and hardness make them suitable for abrasive and corrosive conditions, extending component life.

Boron Nitride Break Ring (H-BN Break Ring) Packaging
Our products are packaged in customized cartons of various sizes based on the material dimensions. Small items are securely packed in PP boxes, while larger items are placed in custom wooden crates. We ensure strict adherence to packaging customization and the use of appropriate cushioning materials to provide optimal protection during transportation.

HBN, CBN, and WBN Comparison
Properties
|
HBN
|
CBN
|
WBN
|
Density (g/cm3)
|
2.27-2.30
|
3.48-3.49
|
~3.49
|
Mohs Hardness
|
1-2
|
9-9.5
|
~9.0
|
Thermal Conductivity (W/mK)
|
∥c axis: 20-30
⊥c axis: 2-5
|
13-20
|
15-18
|
Bandgap (eV)
|
5.0-6.0 (indirect)
|
6.1-6.4 (indirect)
|
~5.8 (direct)
|
Thermal Stability(℃)
|
<900 (in air)
Up to 2000 (in vacuum)
|
<1400 (inert atmosphere)
|
<1200
|
Chemical Inertness
|
Resistance to molten metal erosion
|
Refractory metals
|
Similar to CBN but less researched
|
Frequently Asked Questions
1. What are the main advantages of Boron Nitride Break Rings compared to other ceramic rings?
Boron Nitride Break Rings offer excellent thermal stability, electrical insulation, chemical inertness, and self-lubricating properties. Unlike graphite, they do not conduct electricity, making them ideal for high-voltage and vacuum applications.
2. Can Boron Nitride Break Rings be customized in size and shape?
Yes, Boron Nitride Break Rings are typically manufactured by hot pressing and can be custom-made to meet specific dimensional and tolerance requirements based on your application needs.
3. In which industries are Boron Nitride Break Rings commonly used?
They are widely used in high-temperature mechanical seals, electrical insulation components, vacuum equipment, chemical processing, and aerospace applications where durability, thermal resistance, and electrical insulation are critical.
Related articles:
Boron Nitride Guide: Properties, Structure & Applications
What Are the Characteristics of Hexagonal Boron Nitride?
How SAM Provided Customized Boron Nitride Refractory Devices
Specification
Grade
|
BN99
(Grade AX05)
|
BN-BO
(Grade A)
|
BNCB
(Grade HP)
|
BNSIO
(M&M26)
|
ZSBN
|
Composition
|
hBN > 99.5%
|
hBN > 98%
|
hBN > 90%
|
hBN 40%, SiO2 60% (M)
hBN 60%, SiO2 40% (M26)
|
hBN > 45%
ZrO2 < 45%
Borosilicate < 10%
|
Binder Type
|
Self-Bonded
|
B2O3
|
Calcium Borate
|
SiO2
|
Borosilicate glass
|
Color
|
white
|
white
|
white
|
white
|
gray
|
Density
g/cm3
|
1.9
|
2.0
|
2.0
|
2.1-2.3
|
2.9
|
Compressive Strength
MPa, 25℃
|
25
|
143-186
|
96
|
289-316
|
219-254
|
Hardness (Knoop)
Kg/mm2
|
4
|
20
|
16
|
-
|
100
|
Shape
|
Rod
Plate/Sheet
Tube
Crucible
Custom part
|
Rod
Custom part
|
Custom part
|
Custom part
|
Nozzle
Custom part
|
*The above information is based on theoretical values. For specific customization requirements, please feel free to contact us.
Prototyping service also available for other ceramics material