Why Boron Nitride (BN) Coating Is Essential for Calcium Silicate Board in Aluminum Furnaces
In aluminum melting and holding furnaces, refractory materials are continuously exposed to molten aluminum, high temperatures, oxidation, and thermal cycling. While high-density calcium silicate board provides excellent thermal insulation, adding a Boron Nitride (BN) coating significantly improves surface protection and extends the service life of furnace components.
At Henry Calcium Silicate Board, we provide high-performance calcium silicate insulation materials together with professional BN coating solutions for aluminum processing applications.
What Is Boron Nitride (BN) Coating?
Boron Nitride (BN) coating is a water-based inorganic high-temperature protective coating designed for surfaces that come into contact with molten aluminum, magnesium, and zinc alloys.
Unlike conventional coatings, BN coating is highly resistant to wetting by molten metal, preventing aluminum from sticking to refractory surfaces.
According to our Technical Data Sheet, the coating contains 99.24% effective BN, offers excellent adhesion, and can operate at temperatures up to 1050°C in air.
Key Benefits of BN Coating
Excellent Non-Wetting Performance
The coating prevents molten aluminum from adhering to refractory surfaces, reducing buildup and improving production efficiency.
Superior High-Temperature Resistance
BN coating performs reliably between 400°C and 1700°C, making it suitable for demanding aluminum furnace environments
Longer Service Life
By reducing chemical attack and metal adhesion, BN coating extends the operating life of calcium silicate boards and refractory components.
Water-Based and Environmentally Friendly
The coating contains no organic solvents, produces no unpleasant odors, and poses no fire or explosion hazards during application.
Strong Adhesion
Its durable protective layer resists thermal shock, corrosion, abrasion, and mechanical wear.
Typical Applications
BN coating is widely used in:
- Aluminum melting furnaces
- Aluminum holding furnaces
- Molten aluminum launders
- Ceramic riser tubes
- Refractory blocks
- Graphite components
- Calcium silicate boards
- Ceramic vessels
- Magnesium alloy equipment
- Zinc alloy processing equipment
Technical Specifications
| PropertyValue | |
| Effective BN Content | 99.24% |
| Maximum Service Temperature | 1050°C (Air) |
| BN Particle Size (D50) | 1.9 μm |
| Density | 1.15 g/cm³ |
| Water-Based | Yes |
| Non-Wetting to Molten Aluminum | Yes |
Technical data are based on the Henry BN Coating Technical Data Sheet.
Application Methods
For the best performance, the substrate should be clean and dry before application.
The coating can be applied by:
- Spray coating
- Brush coating
- Dip coating
A coating thickness of approximately 50–150 μm is recommended. The coating should be completely dry before exposure to molten metal.
Why Choose Henry Calcium Silicate Board?
Henry Calcium Silicate Board supplies complete thermal insulation solutions for aluminum industry customers worldwide.
Our products include:
- High Density Calcium Silicate Board
- 1000°C Calcium Silicate Board
- Aluminum Furnace Insulation Board
- BN Protective Coating
- Refractory Insulation Materials
- OEM Manufacturing
- Custom Sizes Available
With years of manufacturing experience, we help aluminum producers improve furnace efficiency, reduce maintenance costs, and extend refractory service life.
Contact Henry Calcium Silicate Board
If you are looking for reliable insulation materials or BN coating solutions for aluminum furnaces, contact our technical team today.
We welcome OEM projects and worldwide distributors.