PFAS & Fluorochemicals in Coatings
Where fluorochemicals appear in coatings, why formulators use them, how regulation is changing and what alternatives are available to specifiers and manufacturers.
Key takeaways
- PFAS (per- and polyfluoroalkyl substances) are a very large family of man-made chemicals defined by strong carbon–fluorine bonds that resist breakdown in the environment.
- In coatings, fluorochemicals appear in three main forms: fluoropolymer binders, fluorinated additives such as surfactants, and fluorinated repellent treatments.
- Regulators in many regions are restricting, phasing out or requiring reporting of PFAS, and the scope and timing of rules differ by jurisdiction and product type.
- Formulators are replacing fluorinated additives with silicone, hydrocarbon and other alternatives where performance allows; fluoropolymer binders are under closer review.
Fluorine chemistry has given coatings some of their most valuable properties: decades-long color retention on architectural metal, non-stick and low-friction surfaces, chemical-resistant linings and flawless flow on difficult substrates. The same carbon–fluorine bond that delivers that durability also makes many fluorinated substances extremely persistent once released.
That persistence — and evidence linking some PFAS to health and environmental harm — has made fluorochemicals one of the most closely watched issues in coatings formulation and specification. This article explains where fluorochemicals occur in coatings, why they are used and how the industry is responding.
What PFAS are
PFAS is an umbrella term for thousands of substances containing fully or partly fluorinated carbon chains. Definitions vary between regulators and organizations, and some definitions are broad enough to include fluoropolymers, while others focus on smaller molecules.
Key characteristics include:
- Persistence. The C–F bond is among the strongest in organic chemistry, so many PFAS do not break down appreciably under natural conditions — hence the nickname “forever chemicals”.
- Mobility. Some smaller PFAS are water-soluble and can travel through soil and groundwater.
- Bioaccumulation and toxicity. Certain long-chain PFAS, such as PFOA and PFOS, accumulate in people and wildlife and are associated with adverse health effects. Toxicity varies widely across the family and is not established for every substance.
Where fluorochemicals appear in coatings
| Form | Examples | Function | Typical amount |
|---|---|---|---|
| Fluoropolymer binders | PVDF, FEVE, PTFE | Weatherability, chemical resistance, non-stick and low friction | Major binder component |
| Fluoropolymer additives | PTFE micropowders and waxes | Slip, mar, abrasion and anti-blocking properties | Small additive levels |
| Fluorosurfactants | Fluorinated wetting, leveling and flow agents | Very low surface tension; wetting of contaminated or low-energy surfaces | Very low levels |
| Side-chain fluorinated polymers | Fluorinated acrylic and urethane repellents | Oil, water and stain repellency; anti-graffiti and easy-clean finishes | Additive or treatment levels |
| Processing aids and impurities | Residues from polymer manufacture | Not intended function; may be present in trace amounts | Trace |
Architectural metal finishes based on PVDF and FEVE are discussed in fluoropolymer coatings. Fluorinated repellents are common in some anti-graffiti coatings and easy-clean finishes, while fluorosurfactants are one class among many coating additives.
Why formulators use them
Fluorochemicals are used because, for certain jobs, they outperform alternatives:
- Durability. Fluoropolymer topcoats can retain gloss and color for decades on building facades and bridges, lengthening repaint intervals.
- Surface tension. Fluorosurfactants reduce surface tension more than most hydrocarbon or silicone surfactants, helping coatings wet oily or low-energy surfaces and preventing defects like craters.
- Repellency. Fluorinated surfaces resist both water and oils, which silicone and wax treatments often cannot match for oil resistance.
- Chemical and thermal resistance. PTFE and related polymers resist aggressive chemicals and high temperatures.
The regulatory landscape
PFAS regulation is evolving quickly and differs by region, so any summary is necessarily general:
- Several long-chain PFAS, notably PFOA and PFOS and related substances, have been restricted internationally, including through the Stockholm Convention on persistent organic pollutants.
- The European Union is evaluating a broad restriction covering a very wide range of PFAS uses, with proposed derogations and transition periods for some applications.
- In the United States, federal agencies including the EPA have introduced reporting requirements and drinking-water standards for certain PFAS, and a number of states have adopted their own product restrictions or disclosure laws.
- Other countries are developing their own approaches, and some purchasers, building certification schemes and retailers set PFAS-free requirements that go beyond the law.
Whether a product is “PFAS-free” depends on the definition being applied. Ask suppliers which definition they use, whether intentionally added fluorochemicals are present, and how trace contamination is addressed. The safety data sheet may not list every fluorinated ingredient present below disclosure thresholds.
Alternatives and substitution
Substitution is easiest where fluorochemicals are minor additives and hardest where they provide the core performance of the film.
Advantages
- Silicone and siloxane surfactants handle many wetting and leveling jobs once done by fluorosurfactants.
- Hydrocarbon surfactants and improved resin design reduce the need for strong wetting agents.
- Polysiloxane and advanced acrylic or polyurethane topcoats offer long weathering life without fluoropolymer binders.
- Waxes, silicones and non-fluorinated polymers provide water repellency and easy-clean properties.
Limitations
- Non-fluorinated repellents generally provide weaker oil resistance.
- Alternative surfactants may not wet heavily contaminated surfaces as well.
- Some fluoropolymer-level weathering and chemical resistance remains difficult to match.
- Reformulation requires new testing, approvals and track records before specifiers accept it.
Substitution also intersects with other sustainability goals, such as lowering VOC content and adopting bio-based raw materials — see sustainable and bio-based coatings.
Practical guidance for specifiers and users
- Identify the requirement. Determine whether a project, client, certification scheme or jurisdiction restricts PFAS, and which definition applies.
- Ask suppliers directly. Request written statements on intentionally added PFAS rather than relying on marketing claims.
- Weigh service life. A fluoropolymer topcoat that doubles repaint intervals has life-cycle benefits that should be considered alongside its fluorine content.
- Handle waste responsibly. Dispose of fluorinated coating waste, blast debris and wash water according to local regulations.
- Stay current. Review requirements periodically; rules and definitions are still changing.
Check the product data sheet and supplier regulatory statements together. Data sheets describe performance; regulatory statements describe composition questions such as PFAS content.
Frequently asked questions
Are fluoropolymer coatings the same as PFAS?
It depends on the definition. Fluoropolymers such as PVDF and PTFE are large, stable polymers, and some definitions include them while others treat them separately. Their manufacture and end-of-life are part of the debate.
Do ordinary industrial coatings contain PFAS?
Many do not. Where present, it is often a small amount of fluorinated additive. Ask the supplier if your project has requirements.
Is cured fluoropolymer paint hazardous to touch?
Cured fluoropolymer films are generally considered inert in normal use. Concerns center on manufacturing emissions, additives, high-temperature decomposition and disposal.
Will PFAS rules affect existing coated structures?
Rules generally target manufacturing, sale and use of new products. Removal and disposal of existing coatings may still be subject to waste regulations.
Educational reference. Coating performance varies by formulation. Always follow the manufacturer’s product data sheet, safety data sheet and your project specification.
