Comparison
hBN vs AlN
Thermal filler decision guide for electrically insulating thermal interface systems.
Author: Aurexene Materials Engineering Team · Last updated: 2026-06-01
Decision Summary
Choose Hexagonal Boron Nitride (hBN) when platelet morphology, processability, and lower moisture sensitivity fit the electrically insulating thermal-interface design; evaluate Aluminum Nitride (AlN) when the thermal target justifies tighter moisture and processing control. Validate both at the same loading, orientation, bondline, and test method.
Comparison Matrix
| Property | Hexagonal Boron Nitride (hBN) | AlN | Advantage |
|---|---|---|---|
| Processability | Good | Moderate | hBN |
| Moisture Sensitivity | Low | Higher | hBN |
| Stability | Strong chemical and moisture stability in adhesive and TIM systems | High thermal performance but more moisture-sensitive handling | hBN |
| Cost Positioning | Higher-value filler for electrically insulating processable systems | Cost varies by grade and purity, often selected for thermal target | Depends |
| Typical Use Case | Thermal pads, adhesives, and potting compounds needing insulation and processability | High thermal conductivity insulation systems where moisture control is managed | Depends |
The matrix is a qualitative screening aid. Confirm grade identity, loading, particle distribution, orientation, moisture history, formulation, bondline, interfaces, electrical limits, and method-conditioned thermal response before selection.