PFAS have been used because they can deliver multiple performance characteristics within a single material or formulation. Replacing them can therefore involve much more than identifying a substitute. 

For many applications, PFAS-free alternatives may need to balance performance, durability, manufacturability, cost and sustainability. What works at laboratory scale may also behave differently when introduced into an existing manufacturing process. 

This creates challenges across the innovation journey: 

• Performance: alternatives may not provide the same combination of repellency, durability or chemical resistance. 

• Reformulation: changing one component can affect the performance and stability of the wider system. 

• Testing and validation: organisations need confidence that alternatives meet the required specifications and end-use requirements. 

• Scale-up: materials and processes that work in the laboratory may require further optimisation before they can be manufactured consistently. 

• Supply chains: suitable alternative materials and compatible suppliers may be difficult to identify and qualify.

• Commercial risk: reformulation can require investment in development, testing, qualification and manufacturing changes. 

The transition away from PFAS is therefore not simply a materials substitution challenge. It's a formulation, validation and scale-up challenge.