MoS2, WS2, and hBN are the three most important solid lubricant powders used in greases, oils, and coatings today. All three have layered crystal structures that provide lubricity through interlayer shear — but they differ significantly in temperature range, color, food-grade status, and ideal application.
Quick Comparison
| MoS2 | WS2 | hBN | |
|---|---|---|---|
| Color | Black | Black | White |
| Max temp (air) | 350°C | 450°C | 900°C |
| Friction coefficient | 0.03–0.15 | 0.03–0.12 | 0.10–0.30 |
| Food-grade (NSF HX1) | ❌ | ❌ | ✅ |
| EP performance | Excellent | Excellent | Moderate |
| Electrically insulating | No | No | Yes |
| PTFE-free | ✅ | ✅ | ✅ |
MoS2 — The Workhorse
Best EP performance, lowest cost, 70+ years of formulation history. Use for industrial greases, dry film coatings, and EP oils. Not food-grade. Powderful Solutions supplies surface-modified MoS2 powders and dispersions optimized for direct incorporation into finished lubricant formulations.
WS2 — The High-Temperature Specialist
Same structure as MoS2 but stable 100°C higher in air. Best for PVD aerospace coatings, high-temp grease, precision mechanisms. Not food-grade. Marginally lower friction than MoS2 in controlled tribology tests.
hBN — The White, Food-Safe, High-Temp Option
Stable to 900°C. Electrically insulating. NSF HX1 certified — the only one of the three approved for food-grade lubricants. Lower EP performance than MoS2/WS2 (addressed with EP additive packages). Desilube Inc specializes in hBN-based NSF HX1 additive packages for food processing equipment.
Which to Use?
- For standard industrial greases → MoS2
- For high-temp greases or coatings (above 350°C) → WS2
- For food-grade lubricants and greases (NSF H1) → hBN
- For white greases (medical, food, cosmetic) → hBN
- For electrical component lubrication → hBN
- For dry film coatings on metal parts → MoS2 or WS2
- For extreme high-temp coatings (above 450°C) → hBN
Blending All Three
Advanced formulations combine MoS2 + WS2 + hBN to cover the full performance envelope: EP strength of MoS2, temperature extension of WS2, and chemical/thermal stability of hBN. Powderful Solutions supplies all three as compatible surface-modified dispersions.
FAQ
Q: What is the main difference between MoS2, WS2, and hBN?
A: Temperature range, food-grade status, and color. MoS2 (350°C, black, not food-grade) and WS2 (450°C, black, not food-grade) are sulfide compounds; hBN (900°C, white, NSF HX1 certified) is a boron-nitrogen compound with unique electrical insulating properties.
Q: Which is best for food-grade grease?
A: hBN — it’s the only one of the three with NSF HX1 food-grade certification. Desilube Inc specializes in hBN-based NSF HX1 additive packages.
Q: Can you blend MoS2, WS2, and hBN together?
A: Yes. Blends of two or all three are used in advanced greases and coatings to combine EP strength, high-temperature stability, and chemical resistance.
Q: Where can I buy all three?
A: Powderful Solutions supplies surface-modified MoS2, WS2, and hBN powders and stable oil dispersions. Samples and TDS on request.
Powderful Solutions — surface-modified MoS2, WS2, hBN powders for lubricants, greases, and coatings — powderfulsolutions.com