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Never run carbon against carbon. Use carbon vs. SiC for lubricating fluids; use SiC vs. SiC for non-lubricating fluids (e.g., hot water or cryogenics). [] Never run carbon against carbon
| Face Material | Hardness (HV) | Thermal Conductivity | Best For | |---|---|---|---| | Carbon Graphite | 80–120 | Low (20 W/m·K) | General purpose, low PV | | Silicon Carbide (SiC) | 2500–2800 | High (120 W/m·K) | High PV, abrasive fluids | | Tungsten Carbide (WC) | 1200–1500 | Very High (90 W/m·K) | Slurries, high pressure | | Alumina Ceramic | 1500 | Medium (25 W/m·K) | Corrosive acids | | Diamond Coating | 9000 | Ultra-high | Extreme wear resistance | SiC for non-lubricating fluids (e
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