Diamond vs CBN vs B4C: Material Selection and Performance Boundaries

SinoDiam – Industrial Diamond Micron For Consistent Quality and Repeatable Output.

Industrial powders such as diamond, CBN (cubic boron nitride), and B4C (boron carbide) differ significantly in hardness, thermal stability, and cutting behavior. Selecting the appropriate material ensures optimal removal rate, surface finish, and process stability. Diamond is preferred for hardest materials like sapphire and optical glass. CBN excels in ferrous metals, while B4C is suitable for specific ceramics.

Comparison Table

Material	Hardness	Best Use Cases	Notes
Diamond	10 Mohs	Optical glass, sapphire, ceramics	High removal rate, minimal subsurface damage
CBN	9 Mohs	Ferrous metals, precision grinding	Thermal stable, wear resistant
B4C	8 Mohs	Ceramic composites	Cost-effective, moderate precision

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