PFAS materials are found in far more places than many people realise. They help make outdoor clothing waterproof, food packaging grease-resistant and industrial equipment capable of operating under extreme conditions. Their performance is impressive. Their persistence is the problem.
Per- and polyfluoroalkyl substances, commonly known as PFAS, are a large family of manufactured chemicals. Thousands of individual substances belong to this group, although only a relatively small number have been studied in detail. What they share is a chain of carbon atoms bonded to fluorine. This carbon–fluorine bond is one of the strongest in organic chemistry, giving PFAS materials exceptional resistance to heat, water, oil and chemical degradation.
Those properties have supported decades of industrial innovation. They have also allowed PFAS to spread through water, soil, wildlife and human populations. Understanding the materials that contain PFAS is therefore essential for managing exposure, improving regulation and developing safer alternatives.
What are PFAS materials?
“PFAS materials” is a broad term. It can refer to pure PFAS chemicals, products treated with PFAS, or industrial substances in which PFAS are used as performance-enhancing ingredients. A non-stick coating, for example, may contain a fluoropolymer rather than the smaller PFAS compounds most often discussed in health studies. Both belong to the wider PFAS family, but their behaviour and risks may differ.
PFAS are often divided into two broad groups:
- Perfluoroalkyl substances: every hydrogen atom attached to the carbon chain has been replaced by fluorine. Perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) are well-known examples.
- Polyfluoroalkyl substances: only some hydrogen atoms have been replaced by fluorine. Certain polyfluoroalkyl substances can break down in the environment into more persistent perfluoroalkyl acids.
PFAS can also be grouped by their molecular size, functional groups and industrial purpose. Short-chain and long-chain PFAS are often discussed in regulatory and scientific assessments, but “short-chain” does not mean harmless. Some short-chain compounds may move more easily through water and can be more difficult to remove using conventional treatment systems.
The scale of the PFAS family creates a significant challenge. Testing one chemical does not tell us everything about thousands of related substances. This is one reason regulators and researchers increasingly consider PFAS as a class rather than assessing every compound in isolation.
Why are PFAS used in so many products?
PFAS materials combine several useful properties in a single chemical family. They can repel water and oil, reduce friction, tolerate high temperatures and resist acids, bases and other aggressive substances. Few other materials offer the same combination of performance and durability.
These characteristics have made PFAS valuable in sectors where failure can have serious consequences. In aviation, aerospace and electronics, fluorinated materials can protect components from heat and chemical damage. In medical technology, they may be used in tubing, catheters, membranes and other specialised equipment. In firefighting, certain PFAS-based foams were designed to spread quickly across flammable liquid fires and suppress vapours.
The same durability that makes PFAS useful in a high-temperature industrial seal can become an environmental liability once the material is discarded. PFAS do not simply disappear when a product reaches the end of its useful life. They may remain in landfills, migrate into leachate and enter wastewater treatment systems that were not designed to destroy them.
Common types of PFAS-containing materials
Fluoropolymers
Fluoropolymers are large, chain-like substances made from fluorinated building blocks. Polytetrafluoroethylene (PTFE), commonly associated with non-stick cookware, is one of the best-known examples. Other fluoropolymers include fluorinated ethylene propylene (FEP) and perfluoroalkoxy polymers (PFA).
These materials are valued for their low friction, chemical resistance and ability to perform at high temperatures. They are used in gaskets, seals, pipes, cables, laboratory equipment, semiconductor manufacturing and electrical insulation.
In their finished form, many fluoropolymers are relatively stable and are not expected to behave in the same way as small, mobile PFAS such as PFOS or PFOA. However, their production may involve processing aids or other fluorinated substances. Manufacturing emissions, abrasion, improper disposal and high-temperature treatment can also create opportunities for release.
Fluorotelomer-based materials
Fluorotelomer chemistry has been used to provide water, oil and stain resistance to textiles, carpets, upholstery, paper and packaging. Examples include treated outdoor clothing, protective workwear and food-contact materials designed to resist grease.
Some fluorotelomer substances can transform over time into persistent perfluoroalkyl acids. This means that a material does not need to contain PFOA or PFOS directly to contribute to their environmental presence. Chemical precursors can act as a delayed source, breaking down slowly through atmospheric, biological or environmental processes.
PFAS-based surfactants
Surfactants help liquids spread, mix or form stable foams. PFAS-based surfactants have been used in metal plating, industrial cleaning and firefighting foams because they perform well under demanding conditions.
Aqueous film-forming foam, or AFFF, is a particularly important example. It was widely used at airports, military bases, fire-training sites, refineries and other locations where petroleum-based fires were a concern. Repeated training exercises and accidental releases have contaminated soil and groundwater at sites around the world.
PFAS-treated textiles and leather
Outdoor jackets, work uniforms, footwear, tents and carpets may receive a fluorinated treatment to improve resistance to rain, stains or oil. The treatment can gradually wear off during use, washing and disposal. Washing may move some PFAS into wastewater, while damaged or discarded textiles can contribute to contamination in landfill environments.
Does a waterproof jacket release the same amount of PFAS as an industrial fire-training site? No. Risk depends on the specific chemistry, concentration, exposure pathway and duration. But the widespread use of treated consumer goods adds many small sources to the broader environmental burden.
Food packaging and processing equipment
PFAS have been used in grease-resistant paper and board, including some fast-food wrappers, takeaway containers, microwave popcorn bags and bakery packaging. They have also been used in gaskets, seals and processing equipment in food manufacturing.
Food packaging is a particular concern because migration can occur when chemicals move from the material into food. Temperature, contact time, food composition and the specific PFAS chemistry all influence migration. Regulatory restrictions are evolving, and consumers should be cautious about assuming that “food contact” automatically means “free from environmental concern.”
Where do PFAS materials enter the environment?
PFAS can be released at several stages of a product’s life cycle:
- Manufacturing: emissions and wastewater from facilities producing or using fluorinated chemicals can affect nearby air, soil and water.
- Product use: washing treated textiles, using certain industrial products or applying firefighting foam can release PFAS.
- Waste management: landfill leachate, wastewater sludge and incinerator residues may contain PFAS or PFAS precursors.
- Transport and accidents: spills during storage, transport or emergency response can create concentrated local contamination.
- Atmospheric movement: some volatile or semi-volatile precursors can travel through the atmosphere before transforming into more persistent compounds.
Wastewater treatment plants illustrate the difficulty. Conventional biological treatment can remove some organic pollutants, but it generally does not destroy PFAS. Instead, PFAS may pass into treated effluent or become concentrated in sewage sludge. If sludge is applied to agricultural land, contaminants may move into soil, drainage water and crops, depending on local conditions and the compounds involved.
Environmental risks linked to PFAS materials
The most widely recognised characteristic of PFAS is persistence. Some compounds remain in the environment for years or decades, while others may persist for much longer. This is why PFAS are often described as “forever chemicals”. The phrase is useful for communicating persistence, although it should not imply that every PFAS behaves identically or literally lasts forever.
PFAS can also be highly mobile. Many compounds dissolve readily in water and can travel through groundwater away from their original source. A contamination plume may therefore extend beyond the boundaries of an industrial site or airport. Once PFAS reach drinking-water sources, removing them can be technically difficult and expensive.
Some PFAS accumulate in living organisms. Certain long-chain compounds bind to proteins in blood and organs rather than behaving like traditional fat-soluble pollutants. They have been detected in fish, birds, mammals and humans. Predators may experience additional exposure by consuming contaminated prey, although bioaccumulation patterns vary considerably between compounds and species.
Research has associated exposure to some PFAS with effects including changes in immune response, altered cholesterol levels, developmental effects and impacts on the liver and thyroid. The strength of evidence differs by compound and outcome. PFOA and PFOS have received the greatest scientific attention, while many replacement PFAS remain less well studied.
Ecological effects are also an active area of research. Laboratory studies have reported effects on growth, reproduction, development and immune function in aquatic organisms and wildlife. Environmental concentrations, mixtures and long-term exposure are difficult to replicate in laboratory settings, so researchers continue to investigate how these findings translate to real ecosystems.
PFAS materials and drinking water
Drinking water is one of the most direct exposure pathways because PFAS can move from contaminated groundwater or surface water into treatment systems. Activated carbon and reverse osmosis can reduce many PFAS, but performance depends on the compound, water chemistry, treatment design and operating conditions.
Granular activated carbon is often more effective for longer-chain PFAS, while shorter-chain compounds can be more difficult to capture. Reverse osmosis can remove a broader range, but it produces a concentrated waste stream that still requires management. Neither technology should be treated as a universal solution: prevention at the source remains more sustainable than repeatedly treating contaminated water.
Household water filters may provide additional protection, but their performance varies. Consumers should check whether a product has been independently tested for PFAS reduction, follow replacement instructions and remember that a filter does not remove contamination from the wider environment.
How regulators and industry are responding
Regulation is moving from a focus on a few well-known compounds towards broader controls on PFAS groups. Authorities in the UK, European Union and elsewhere are developing drinking-water standards, product restrictions, monitoring requirements and guidance for contaminated land.
Industry is also examining alternatives, including non-fluorinated water- and oil-repellent coatings, redesigned packaging, mineral-based barriers and different firefighting technologies. The challenge is to ensure that replacements are genuinely safer. Substituting one poorly studied fluorinated chemical for another may reduce attention on a particular compound without reducing the overall risk.
Effective management requires a life-cycle approach. A material should be assessed not only for its performance during use, but also for its manufacture, potential degradation products, recycling options and end-of-life disposal. “PFAS-free” claims should be supported by clear definitions and reliable testing, especially where products are marketed to environmentally conscious consumers.
What can organisations and consumers do?
- Identify where PFAS are used in products, processes, packaging and firefighting systems.
- Replace non-essential uses with verified alternatives where performance and safety allow.
- Test water, soil and waste streams near current or historic PFAS-use sites.
- Prevent contaminated materials from entering uncontrolled waste or recycling systems.
- Use certified or independently verified water-treatment technologies where contamination is confirmed.
- Ask suppliers for detailed chemical and product information rather than relying only on broad marketing claims.
- Support monitoring programmes that track PFAS in drinking water, wildlife, sediment and wastewater.
For households, practical steps include reducing unnecessary use of stain-resistant treatments, checking product information, avoiding damaged non-stick cookware and following local advice when private wells are near airports, industrial sites, landfills or fire-training grounds. These actions cannot solve widespread contamination alone, but they can reduce avoidable exposure and improve demand for safer materials.
Why understanding the material matters
PFAS are not a single product and not a single risk. A fluoropolymer seal in industrial equipment, a treated food wrapper and a firefighting foam concentrate may differ substantially in structure, mobility and exposure potential. Treating them as identical can lead to poor decisions. Treating them as completely unrelated can allow important sources to escape oversight.
The central issue is the balance between performance and persistence. PFAS materials have solved difficult engineering problems, but their environmental cost was often overlooked because contamination can appear long after manufacture or use. Better monitoring, stronger controls and safer product design can reduce that cost.
The most effective strategy is straightforward: use PFAS only where they are essential, control releases throughout the product life cycle and invest in alternatives that do not replace one persistent problem with another. For a chemical family designed to resist almost everything, prevention remains the most reliable form of protection.