Introduction
As global environmental regulations tighten around PFAS-based chemicals, paper manufacturers are actively seeking fluorine-free coating solutions that deliver comparable grease resistance. This article explores the mechanism behind oil repellents for paper, focusing on how eco-friendly greaseproof agents such as Azfc® 90F and Azfc® 60F work—without relying on fluorine chemistry.
1. The Science Behind Oil Repellency
Oil barrier coatings work by increasing the surface energy difference between the paper substrate and oil-based contaminants. Two key concepts are involved:
- Contact Angle (Penetration Angle): A higher contact angle (>90°) means better repellency. Fluorine-free agents aim to maintain this by forming a dense, hydrophobic barrier on the paper surface.
- Surface Tension Control: By lowering the surface energy of the paper below that of common oils (20–30 dyn/cm), penetration is effectively blocked.
2. Fluorine-Free Formulations: Wax-Based vs. Silicone-Based
Modern fluorine-free technologies use safe, biodegradable materials to replicate oil barrier performance. Two dominant types are:
Wax-Based Repellents (e.g., Azfc® 60F)
- Create a crystalline hydrophobic film
- Compatible with traditional sizing or coating systems
- Economical option for light to moderate oil resistance needs
- Best suited for: fast food wrappers, e-commerce mailers
Silicone-Based Repellents (e.g., Azfc® 90F)
- Form a flexible, thermally stable surface film
- Excellent performance at elevated temperatures (up to 100°C)
- Ideal for direct food contact and demanding greaseproof applications
- Best suited for: hot food trays, industrial greaseproof paper
3. Fluorine-Free vs. Fluorinated Agents: A Performance Comparison
| Criteria | Fluorinated Repellents | Fluorine-Free (Wax/Silicone) |
|---|---|---|
| Contact Angle | ≥110° | 95–105° |
| Thermal Resistance | Up to 120°C | Wax: ~90°C / Silicone: ~100°C |
| Regulatory Compliance | High PFAS restrictions | PFAS-free, food-safe |
| Environmental Impact | Persistent in environment | Biodegradable, REACH-compliant |
| Cost | High | Medium to low (based on formulation) |
4. Product Spotlight: Azfc® Fluorine-Free Solutions
Looking to transition to safer, PFAS-free alternatives?
🔹 Azfc® 90F – Fluorine-Free Oil Repellent 100°C
High-temp resistant, ideal for food-grade packaging
🔹 Azfc® 60F – Fluorine-Free Oil Repellent
Cost-effective wax-based solution for general packaging
Conclusion
As legislation and consumer awareness reshape the packaging landscape, fluorine-free oil repellents for paper are becoming the new standard. With the right chemistry, these alternatives deliver excellent grease resistance without the environmental burden of PFAS.
Explore our eco-friendly coatings today and upgrade your packaging performance—safely and sustainably.
Ready to switch to safer oil repellent solutions? Explore our fluorine-free oil repellent product line →
