For decades, PTFE (polytetrafluoroethylene) has been the go-to solid lubricant additive in food-grade greases and oils. It’s slippery, chemically inert, and thermally stable. But a growing regulatory wave — and a better alternative — is pushing food processors to reconsider.
What Is PTFE in a Lubricant?
PTFE is a fluoropolymer solid lubricant added to greases and oils to reduce friction and wear. In food-grade lubricants, PTFE particles are dispersed in the base oil or thickener system to improve lubricity under load.
Common trade names for PTFE used in lubricants include Teflon (DuPont/Chemours), Dyneon, and Algoflon. In food-grade greases, PTFE content typically ranges from 1–5% by weight.
The PFAS Problem
PTFE is a per- and polyfluoroalkyl substance (PFAS) — part of a large family of fluorinated chemicals that have come under intense regulatory scrutiny worldwide.
Key regulatory developments affecting PTFE in food-grade lubricants:
- US EPA PFAS Action Plan — ongoing restrictions and reporting requirements for PFAS compounds including PTFE precursors
- EU REACH PFAS Restriction — proposed universal restriction covering thousands of PFAS substances, potentially including PTFE in certain applications
- EU Food Contact Materials Regulation — increasing scrutiny of fluoropolymers in food-contact applications
- State-level bans (California, Maine, others) — restricting PFAS in consumer and food-contact products
- Food manufacturer zero-PFAS policies — major brands proactively eliminating fluorinated compounds from their supply chains
While PTFE itself is considered chemically inert and is currently permitted in NSF H1 lubricants, the direction of regulation — and food brand purchasing policies — is clearly moving toward PFAS-free.
What Is the Best PTFE-Free Alternative for Food-Grade Lubricants?
Hexagonal boron nitride (hBN) has emerged as the leading PTFE replacement in food-grade lubricant formulations. Here’s why:
| Property | PTFE | hBN (Desilube) |
|---|---|---|
| NSF HX1 certified | ✅ | ✅ |
| PTFE-free / PFAS-free | ❌ | ✅ |
| Max service temp | ~260°C | >900°C (inert) |
| Coefficient of friction | Low | Comparable to PTFE |
| Anti-wear performance | Moderate | High |
| Extreme pressure rating | Low | High (with EP package) |
| Thermal conductivity | Very low | High (good heat dissipation) |
| Particle size control | Variable | Precisely engineered |
hBN is a layered hexagonal crystal structure — like graphite, but white and electrically insulating. Its platelet structure allows it to shear easily under load, providing excellent lubricity. Unlike PTFE, it doesn’t break down into fluorinated byproducts at elevated temperatures.
Desilube’s PTFE-Free hBN Additive Line
Desilube Inc has specialized in hBN-based food-grade lubricant additives for over 30 years. All Desilube products are:
– NSF HX1 certified — approved for use in H1 food-grade finished lubricants
– PTFE-free and PFAS-free — no fluorinated compounds
– Engineered for compatibility — tested in PAO, mineral oil, and ester base stocks with common food-grade thickeners (aluminum complex, lithium complex, polyurea)
Key products:
– Desilube 77 — anti-wear/anti-friction additive for food-grade greases and oils
– Desilube 88 — enhanced anti-wear package for higher-load applications
– Desilube 98F — extreme-pressure additive for heavy-duty food processing equipment
– Desilube 99L/FEL — complete additive package for food-grade grease formulation
– Desilube AEP — lignin-based bio EP additive, the only non-sulfur, non-PTFE EP option
Making the Switch: What to Expect
Formulators switching from PTFE to hBN-based additives typically find:
– Drop-in compatibility at similar treat rates (1–3%)
– Performance parity or improvement in wear and friction tests
– Better high-temperature stability — hBN doesn’t soften or migrate at elevated temperatures the way PTFE can
– Cleaner regulatory story — no PFAS disclosures required
Frequently Asked Questions
Q: Is hBN approved for food-grade lubricants?
A: Yes. Desilube’s hBN-based additives carry NSF HX1 certification, making them approved for use in H1-rated food-grade finished lubricants with incidental food contact.
Q: Will switching from PTFE to hBN affect my grease’s performance?
A: In most cases, no. hBN provides comparable anti-wear and anti-friction performance to PTFE, with superior performance at high temperatures and under extreme pressure. Treat rates are similar (1–3% by weight).
Q: Is PTFE currently banned in food-grade lubricants?
A: Not yet in most jurisdictions. However, the regulatory direction — and major food brand procurement policies — are moving toward PFAS-free. Switching now avoids reformulation costs and compliance disruptions later.
Desilube Inc manufactures NSF HX1-certified, PTFE-free and PFAS-free hBN lubricant and grease additives. Contact us at desilubeinc.com to request samples or TDS.